SpecNext Wiki - User contributions [en-gb]

ZX Next Clones

2025-09-05T21:45:58Z

Phoebus: Correction

The ZX Spectrum Next is open hardware; as such it can be completely cloned (both the hardware based on the official schematics and the core) or its core ported to different platforms using the same or different FPGAs

== ZX Next clones ==

ZX Spectrum Next clones use the same FPGA model as one of the revisions of the machines produced by SpecNext Ltd duplicating also the corresponding schematics. In essence they are complete ZX Spectrum Nexts and their core is updated using the official core contained in the System/Next distribution.

There are two clones available at the time of writing

[[N-Go]] - The [https://manuferhi.com/c/n-go N-Go] is a full KS1 ZX Spectrum Next clone coming in a full size PCB with ESP and RTC complete with 2 Mega Drive style joystick ports, an expansion port and optional custom case and mechanical keyboard. It also has the option of working as a ZX DOS using a switch in which case all the ZX Uno/ZX DOS cores are available to the user.

[[Xberry Pi]] - is a ZX Spectrum Next clone with a PCB roughly the same dimensions as a Raspberry Pi 3 without extra hardware like the ESP, full size expansion bus and extra joystick port (they are however fully expandable).

== ZX Next core ports ==

The Spectrum Next core has been ported to several different FPGAs with varying degrees of completeness and compatibility, including:

[[ZX-DOS]] - FPGA-based hardware recreation of the ZX Spectrum, created by [https://www.antoniovillena.es/ Antonio Villena].

[https://zxdos.forofpga.es/ ZX-DOS+ and gomaDOS+] - ZXDOS+ and gomaDOS+ are the continuation of ZX-Uno. They are the same machine in a different case.

[https://github.com/MiSTer-devel/ZXNext_MISTer ZX Spectrum Next for MiSTer Platform] - an incomplete ZX Next core for MiSTer FPGA compatible systems].

[https://antoniovillena.com/product/zxtres/ ZXTRES] - The ZXTRES, ZXTRES+ and ZXTRES++ are Next clones with several alternative cores.[https://github.com/zxtres/wiki/wiki ZXTRES wiki.]

[https://github.com/andykarpov/karabas-go Karabas Go] - A Spartan-6 based devboard with a fully working Spectrum Next core.

[https://www.arananet.net/pedidos/product/unamiga-a500-header-compatible-with-a500-and-checkmate-1500-cases-pre-order UnAmiga] and [https://www.arananet.net/pedidos/product/unamiga-reloaded-standalone-preorder Unamiga Reloaded] have ZX Next cores.

FAQ

2020-04-18T10:53:23Z

Phoebus: Added HDMI issues section and problematic software section

== I am using HDMI and I get no picture ==
When the Next boots hold down D for DIGITAL (HDMI) – Mode 7 50hz / 60hz can be selected. N selects the next frequency, ENTER selects it and saves. ONLY PRESS ENTER if you actually see a screen like the one below. N is NOT necessary as the testscreen will automatically go to the next mode albeit slower.
[[File:Figure02-TestScreenMode7.png|thumb|ZX Spectrum Next Test Screen]]

You will also get an audible intermittent tone so you know your audio is working. It's possible your display can lock onto both modes but only one being able to lock onto the audio. Choose the one with the tone before pressing ENTER.

== I am using VGA and I get no picture ==
When the Next boots hold down V for VGA – Mode 0-6 50hz / 60hz can be selected. VGA0 is the
preferred mode as this has accurate timings. 1 – 6 are also accurate timings but increase slightly
in speed. N works as above but there are 12 possible configurations you can choose from. You'll start at VGA0@50Hz, next one will be the same at 60Hz and so forth. ENTER again selects and saves the changes. Audio is also being produced during the VGA Test Screen phase, however you will need powered speakers (or earphones) plugged in the audio out connector at the back of your Next.
[[File:Spectrum-plus-3-tape-lead.jpg|thumb|ZX Spectrum Next/+3 Tape Lead]]

== I'm using an HDMI display and a game's graphics appear garbled ==
Some games (specifically ones with multicolour or border effects - eg. Nirvana/Bifrost engine games, certain demos particularly ex-Soviet demoscene ones) require precise timings as with a regular Spectrum. Due to the nature of HDMI displays and the lack of internal buffering on the Spectrum Next display hardware currently these will not work properly and require a VGA or RGB display.
This is expected to be fixed in a future edition of the core/distribution but until then, there are a few alternative solutions:
a. An extra Spectrum core that implements precise HDMI timings by removing some of the Next's extra features.
b. Use of OSSC hardware which takes the Next's RGB/VGA display and converts it to HDMI independently
c. Use of the ZXHD or TkPie hardware expansions (only for standard Spectrum modes at 3.5MHz clock)
Next specific programs do not have this issue as they're made taking the current HDMI timing differences into account and will continue to work in the future when the most appropriate HDMI solution is implemented.

== HELP! My <insert game name here> doesn't work while it works on my <insert older Spectrum model here> ==
This is most likely due to a specific incompatibility of said program with the Next's extra hardware. The NextZXOS loader module, provides a lot of options for loading software catering to each model's idiosyncracies but also gives you the option to disable almost all Next extra hardware in order to make it work. If, after trying everything, the software doesn't work, you need to inform the team using the official gitlab repo "Issues" (registration is required) and provide a link to a copy of your program. The team will look at the specific issue and respond/fix the issue as soon as possible.

== What classic files can I load on my Next? ==
The Next supports TAPs (preferred), SNAs, DSKs, Z80s which can be loaded from the browser
menu by selecting them with the cursor keys and ENTER (or a joystick and Fire) -OR- by using the SPECTRUM command. (See Chapter 20 in the manual for details).
Place the files on your SD card and pick from the Browser.
If you are using an external tape player then you require a cable from player to the EAR/MIC
socket of your Next. A Tape Tester is provided from the main menu of NextZXOS – Select More
and Tape Tester.
When you are ready to load a real tape choose the Tape Loader and press PLAY on your player.
The cable follows [https://store.activeconsult.co.uk/shop?olsPage=products%2Fear-mic-cable&page=2 the +3 standard] and MUST be monophonic from the TAPE deck side. Do not try a straight mono cable as used in the Spectrum 128 and earlier as it will not work.

== How can I load TZX files? ==
TZX files can be loaded if you have a pi0 or an external TZX player. If you have a pi0 please see
below for more information. Before asking for help please have this information ready 

== My LED does not go out when I unplug the power! ==
[[File:Ped-hdmi.jpg|thumb|ZX Spectrum Next Test Screen]]
Some TVs will back-power the Next through the HDMI cable, so it’s important to '''REMOVE ALL CABLES''' after a firmware
update and to turn off completely. If your TV/Display has multiple inputs try using one of the other ones as usually NOT ALL HDMI ports exhibit this behaviour.

Next user Ped7g has kindly provided this helpful infographic.

== How do I update my Next? ==
Zero day distro is [https://www.specnext.com/latestdistro/ here]. To update your Next, extract the contents of the distro to your SD card. Power down the Next,
Press and hold U and power on until you see the Updater screen and follow the instructions. As
above if you are using HDMI you need to remove all cables when instructed to power off your
Next.

== How do I update the Pi in my Next (NextPi)? ==
NextPi can be downloaded [https://zx.xalior.com/NextPi/ here], and you can use [https://www.balena.io/etcher/ Etcher] to write this to a 1GB SD card.

== I have a pi0 but cannot get TZXs to load ==
You will require a new updated '''dot/pisend''' and '''nextzxos/tzxload.bas''' from the
[https://gitlab.com/thesmog358/tbblue git repository]. These need to be placed in the correct folders on your SD
card. These files have updated after the distro was released. 
You can check if the pi0 is correctly responding by going into Command Line and running “.term”
You should see Terminex, press SYM+SHIFT+B to switch to 115,200 baud and press Enter. If you
see the words “SUP>” then your pi0 is ready. You can quit Terminex by pressing SYM+SHIFT+Q

To load a TZX, place some TZX files on your SD card and you should be able to select the files
from the Browser and the Next should do the rest. If you come across a game that doesn’t work
please let us know.

I have problems loading TZXs: 
 
Are you on the latest core / NextZZOS? 
Have you updated to the latest git distro? [https://gitlab.com/thesmog358/tbblue/-/archive/master/tbblue-master.zip git repository] 
What video mode are you using? (VGA0/HDMI etc) 
What game didn't work? (You need to supply the exact name) 
Where did the loading fail? Did the game load fine but crash etc? 

== How do I sort the contents of my SD card? ==
You will need to use a tool on a PC such as [http://www.anerty.net/software/file/DriveSort/?lang=en DriveSort]

== Where do I buy RTC / Mouse / Memory / Wifi / Pi0 / Inline Power Switch… ==
ActiveConsult sell most of these products and can be found [https://store.activeconsult.co.uk/shop?olsPage=products&page=1 here].
SCART cables can be purchased [https://coolnovelties.co.uk/coolnovelties/sinclair-zx-spectrum/312-zx-spectrum-next-analog-rgb-scart-cable-0705693507088.html here], also here: [https://www.retrocomputershack.com/] NOTE that you will need to boot your ZX Spectrum Next and press the R key to set up the SCART output.

== What controller / joystick / gamepad can I use? ==
The Next supports any “Atari” standard joystick or gamepad, along with Master System and
MegaDrive pads. A good option is the [https://www.amazon.co.uk/8Bitdo-Wireless-Gamepad-Original-Genesis/dp/B07HB1XFQW 8bitdo wireless MegaDrive pad].
You '''CANNOT''' use the '''Sinclair Branded SJS-1''' joysticks sold for +2/2A/3 ZX Spectrums as they require a special adapter.

== How do I change the CPU speed/ Scanlines etc? ==
The following keys combinations can be used to : 
NMI + 1 Hard reset 
NMI + 2 toggle scan doubler 
NMI + 3 toggle 50 / 60 Hz 
NMI + 4 Soft reset 
NMI + 7 Toggle scan lines (25/50/75%) 
NMI + 8 Toggle CPU speed (3.5/7/14/28) 
NMI + 9 NMI menu 

== Where can I download games / roms ? ==
[https://spectrumcomputing.co.uk/ Spectrum Computing] and [https://www.worldofspectrum.org/ World of Spectrum] are good places to start

== My internal keyboard is not responding – help!==
First turn off the Next completely and remove all cables and try again. Failing that a keyboard
cable may have become loose. You can watch a video on how to open your Next here: 
https://www.youtube.com/watch?v=iLDz4AjL3rA

== My ps/2 keyboard is not responding – help!==
Edit your '''c:/machines/next/config.ini''' file so that '''ps2=0''', or use a [https://store.activeconsult.co.uk/shop?olsPage=products%2Fps2-keyboard-mouse-splitter ps/2 splitter].

== How do I install pi0 / Wifi / RTC / Memory? ==
As above a guide on how to open your Next can be viewed. Also read the appropriate Chapter in the manual.
[https://www.youtube.com/watch?v=iLDz4AjL3rA here].

== How can I get the expansion bus working with external hardware? ==
By default, the Next disables the expansion bus, as external hardware can conflict and is unlikely to run at CPU speeds faster than 3.5MHz. The bus can be enabled and and individual conflicting internal hardware disabled through Next registers 128 and 130..137 (manual pages 270..271). [https://www.specnext.com/forum/viewtopic.php?f=6&t=1482&p=9701&hilit=RAM+music+machine+expansion+bus#p9701 Here] is a detailed example of getting the RAM Music Machine working, and [https://www.youtube.com/watch?v=EU9NTQqQ1fg here] is a video demonstrating unsing Interface 1/microdrives.

== Can I use Amstrad/Sinclair SJS-1 joysticks with the Next? ==

'''NO!''' [https://rk.nvg.ntnu.no/sinclair/computers/peripherals/sjs1.htm SJS-1 joysticks] have fundamentally incompatible wiring compared with the standard Atari-wired joysticks the Next uses. Using them on the Next will short the 5V line to ground, potentially damaging your Next. Bin them, sell them, or keep them for your original +2, +2A or +3, where they will work fine but still be quite rubbish.

== Why doesn't the manual have a table of contents / index ==
Short answer: It didn't fit in the box as the boxes were made way before the manual was completed.
Long answer: TL;DR :)

== Where can I download a copy of the manual with a ToC and index? ==
Right here : https://www.specnext.com/zx-spectrum-next-user-manual-first-edition/

== Further Spectrum Next Guides ==
https://www.youtube.com/playlist?list=PL2lCM2mJCG_AonDyHJfqjxFR5VoqBWqoh

FAQ

2020-02-20T16:02:43Z

Phoebus:

FAQ

2020-02-20T15:59:03Z

Phoebus:

FAQ

2020-02-20T14:44:51Z

Phoebus:

FAQ

2020-02-20T14:38:21Z

Phoebus:

== I am using HDMI and I get no picture ==
When the Next boots hold down D for DIGITAL (HDMI) – Mode 7 50hz / 60hz can be selected. N selects the next frequency, ENTER selects it and saves. ONLY PRESS ENTER if you actually see a screen like the one below:
[[File:Figure02-TestScreenMode7.png|thumb|ZX Spectrum Next Test Screen]]

You will also get an audible intermittent tone so you know your audio is working. It's possible your display can lock onto both modes but only one being able to lock onto the audio. Choose the one with the tone before pressing ENTER.

== I am using VGA and I get no picture ==
When the Next boots hold down V for VGA – Mode 0-6 50hz / 60hz can be selected. VGA0 is the
preferred mode as this has accurate timings. 1 – 6 are also accurate timings but increase slightly
in speed.

== What classic files can I load on my Next? ==
The Next supports TAPs (preferred), SNAs, DSKs, Z80s and can be loaded from the browser
menu. Place the files on your SD card and pick from the Browser.
If you are using an external tape player then you require a cable from player to the EAR/MIC
socket of your Next. A Tape Tester is provided from the main menu of NextZXOS – Select More
and Tape Tester.
When you are ready to load a real tape choose the Tape Loader and press play on your player

== How can I load TZX files? ==
TZX files can be loaded if you have a pi0 or an external TZX player. If you have a pi0 please see
below for more information

== My LED does not go out when I unplug the power! ==
HDMI will back power the Next, so it’s important to REMOVE ALL CABLES after a firmware
update and to turn off completely. This might be fixed in a later FW.

== How do I update my Next? ==
Zero day distro is here : https://www.specnext.com/latestdistro/
To update your Next, extract the contents of the distro to your SD card. Power down the Next,
Press and hold U and power on until you see the Updater screen and follow the instructions. As
above if you are using HDMI you need to remove all cables when instructed to power off your
Next.

== I have a pi0 but cannot get TZXs to load ==
You will require a new updated dot/pisend and nextzxos/tzxload.bas from the git :
https://gitlab.com/thesmog358/tbblue These need to be place in the correct folders on your SD
card. These files have updated after the distro was released.
You can check if the pi0 is correctly responding by going into Command Line and running “.term”
You should see Terminex, press SYM+SHIFT+B to switch to 115,200 baud and press Enter. If you
see the words “SUP>” then your pi0 is ready. You can quit Terminex by pressing SYM+SHIFT+Q

To load a TZX, place some TZX files on your SD card and you should be able to select the files
from the Browser and the Next should do the rest. If you come across a game that doesn’t work
please let us know.

== How do I sort the contents of my SD card? ==
You will need to use a tool on a PC such as DriveSort
http://www.anerty.net/software/file/DriveSort/?lang=en

== Where do I buy RTC / Mouse / Memory / Wifi / Pi0 / Inline Power Switch… ==
ActiveConsult sell most of these products and can be found here:
https://store.activeconsult.co.uk/shop?olsPage=products&page=1

== What controller / joystick / gamepad can I use? ==
The Next supports any “Atari” standard joystic or gamepad, along with Master System and
MegaDrive pads. A good option is the 8bitdo wireless MegaDrive pad
https://www.amazon.co.uk/8Bitdo-Wireless-Gamepad-Original-Genesis/dp/B07HB1XFQW

== How do I change the CPU speed/ Scanlines etc? ==
The following keys combinations can be used to :
NMI + 1 Hard reset
NMI + 2 toggle scan doubler
NMI + 3 toggle 50 / 60 Hz
NMI + 4 Soft reset
NMI + 7 Toggle scan lines (25/50/75%)
NMI + 8 Toggle CPU speed (3.5/7/14/28)
NMI + 9 Toggle CPU speed (3.5/7/14/28)

== Where can I download games / roms ? ==
www.spectrumcomputing.co.uk / worldofspectrum.org are good places to start

== My keyboard is not responding – help!==
First turn off the Next completely and remove all cables and try again. Failing that a keyboard
cable may have become loose. You can watch a video on how to open your Next here:
https://www.youtube.com/watch?v=iLDz4AjL3rA

== How do I install pi0 / Wifi / RTC / Memory? ==
As above a guide on how to open your Next can be viewed here:
https://www.youtube.com/watch?v=iLDz4AjL3rA

== Further Spectrum Next Guides ==
https://www.youtube.com/playlist?list=PL2lCM2mJCG_AonDyHJfqjxFR5VoqBWqoh

File:Figure02-TestScreenMode7.png

2020-02-20T14:36:44Z

Phoebus:

Boot Testcard

Circuit Diagrams

2019-07-02T10:03:23Z

Phoebus:

== J13 - Daughter board connector ==

{| width=100%
|valign=top width=50%| [[Image:DaughterLocation.jpg]]
|valign=top| [[Image:Circuit_daughter_board.png]]
|}

 

== J15 - Next GPIO ==

{| width=100%
|valign=top width=50%| [[Image:NEXT_GPIO_location.jpg]]
|valign=top width=50%| [[Image:NEXT_GPIO.png|461px]]
|}

 

== CN5 - Expansion bus (edge connector) ==

{| width=100%
|valign=top width=50%| [[Image:Expansion_bus_location.jpg]]
|valign=top| [[Image:Expansion_bus.png|461px]]
|}

 

== J10/J11 - Memory Expansion Ports ==

{| width=100%
|valign=top width=50%| [[Image:Mem_Expansion_location.jpg]]
|valign=top| [[Image:Mem_Expansion.png|461px]]
|}

 

== J4/J7 J8/J14 - Joystick Ports ==

{| width=100%
|valign=top width=50%| [[Image:Joystick_Ports_Location.jpg]]
|valign=top| [[Image:Joystick_Ports.png]]
|}

 

== CN1 - VGA Video Port ==

{| width=100%
|valign=top width=50%| [[Image:Video_Port_Location.jpg]]
|valign=top| [[Image:Video_Port.png]]
|}

 

== CN8 - Digital Port ==

{| width=100%
|valign=top width=50%|[[Image:Digital Port Location.jpg]]
|valign=top| [[Image:Next Digital Port.png]]
|}

 

== CN2/CN6/CN7 - SD Reader (Mainboard) (CN6 on reverse) ==

{| width=100%
|valign=top width=50%| [[Image:SD_Reader_Port_Location.jpg]]
|valign=top| [[Image:SD_Reader_Main.png]]
|}

 

== CN10/CN11/CN12 - SD Reader (Daughterboard) (CN12 on reverse) ==

{| width=100%
|valign=top width=50%| [[Image:SD_Reader_Daughter_Port_Location.jpg]]
|valign=top| [[Image:SD_Reader.png]]
|}

 

== Accelerator Board ==

{| width=100%
|valign=top width=50%| [[Image:Accelerator_Port_Location.jpg]]
|valign=top| [[Image:Accelerator_Port.png]]
|}

 

== Real Time Clock (RTC) ==

{| width=100%
|valign=top width=50%| [[Image:RTC_Port_Location.jpg]]
|valign=top| [[Image:RTC_Port.png]]
|}

Circuit Diagrams

2019-07-02T10:02:19Z

Phoebus:

== J13 - Daughter board connector ==

{| width=100%
|valign=top width=50%| [[Image:DaughterLocation.jpg]]
|valign=top| [[Image:Circuit_daughter_board.png]]
|}

 

== J15 - Next GPIO ==

{| width=100%
|valign=top width=50%| [[Image:NEXT_GPIO_location.jpg]]
|valign=top width=50%| [[Image:NEXT_GPIO.png|461px]]
|}

 

== CN5 - Expansion bus (edge connector) ==

{| width=100%
|valign=top width=50%| [[Image:Expansion_bus_location.jpg]]
|valign=top| [[Image:Expansion_bus.png|461px]]
|}

 

== J10/J11 - Memory Expansion Ports ==

{| width=100%
|valign=top width=50%| [[Image:Mem_Expansion_location.jpg]]
|valign=top| [[Image:Mem_Expansion.png|461px]]
|}

 

== J4/J7 J8/J14 - Joystick Ports ==

{| width=100%
|valign=top width=50%| [[Image:Joystick_Ports_Location.jpg]]
|valign=top| [[Image:Joystick_Ports.png]]
|}

 

== CN1 - VGA Video Port ==

{| width=100%
|valign=top width=50%| [[Image:Video_Port_Location.jpg]]
|valign=top| [[Image:Video_Port.png]]
|}

 

== CN8 - Digital Port ==

{| width=100%
|valign=top width=50%|[[Image:Digital Port Location.jpg]]
[[Image:HDMI_Port_Location.jpg]]
|valign=top| [[Image:Next Digital Port.png]]
|}

 

== CN2/CN6/CN7 - SD Reader (Mainboard) (CN6 on reverse) ==

{| width=100%
|valign=top width=50%| [[Image:SD_Reader_Port_Location.jpg]]
|valign=top| [[Image:SD_Reader_Main.png]]
|}

 

== CN10/CN11/CN12 - SD Reader (Daughterboard) (CN12 on reverse) ==

{| width=100%
|valign=top width=50%| [[Image:SD_Reader_Daughter_Port_Location.jpg]]
|valign=top| [[Image:SD_Reader.png]]
|}

 

== Accelerator Board ==

{| width=100%
|valign=top width=50%| [[Image:Accelerator_Port_Location.jpg]]
|valign=top| [[Image:Accelerator_Port.png]]
|}

 

== Real Time Clock (RTC) ==

{| width=100%
|valign=top width=50%| [[Image:RTC_Port_Location.jpg]]
|valign=top| [[Image:RTC_Port.png]]
|}

File:Digital Port Location.jpg

2019-07-02T10:01:31Z

Phoebus:

Digital Port Location on the Next Board

File:Next Digital Port.png

2019-07-02T09:57:23Z

Phoebus: Phoebus uploaded a new version of File:Next Digital Port.png

Next Digital Video Port

Circuit Diagrams

2019-07-02T09:54:45Z

Phoebus:

== J13 - Daughter board connector ==

{| width=100%
|valign=top width=50%| [[Image:DaughterLocation.jpg]]
|valign=top| [[Image:Circuit_daughter_board.png]]
|}

 

== J15 - Next GPIO ==

{| width=100%
|valign=top width=50%| [[Image:NEXT_GPIO_location.jpg]]
|valign=top width=50%| [[Image:NEXT_GPIO.png|461px]]
|}

 

== CN5 - Expansion bus (edge connector) ==

{| width=100%
|valign=top width=50%| [[Image:Expansion_bus_location.jpg]]
|valign=top| [[Image:Expansion_bus.png|461px]]
|}

 

== J10/J11 - Memory Expansion Ports ==

{| width=100%
|valign=top width=50%| [[Image:Mem_Expansion_location.jpg]]
|valign=top| [[Image:Mem_Expansion.png|461px]]
|}

 

== J4/J7 J8/J14 - Joystick Ports ==

{| width=100%
|valign=top width=50%| [[Image:Joystick_Ports_Location.jpg]]
|valign=top| [[Image:Joystick_Ports.png]]
|}

 

== CN1 - VGA Video Port ==

{| width=100%
|valign=top width=50%| [[Image:Video_Port_Location.jpg]]
|valign=top| [[Image:Video_Port.png]]
|}

 

== CN8 - Digital Port ==

{| width=100%
|valign=top width=50%| [[Image:HDMI_Port_Location.jpg]]
|valign=top| [[Image:Next Digital Port.png]]
|}

 

== CN2/CN6/CN7 - SD Reader (Mainboard) (CN6 on reverse) ==

{| width=100%
|valign=top width=50%| [[Image:SD_Reader_Port_Location.jpg]]
|valign=top| [[Image:SD_Reader_Main.png]]
|}

 

== CN10/CN11/CN12 - SD Reader (Daughterboard) (CN12 on reverse) ==

{| width=100%
|valign=top width=50%| [[Image:SD_Reader_Daughter_Port_Location.jpg]]
|valign=top| [[Image:SD_Reader.png]]
|}

 

== Accelerator Board ==

{| width=100%
|valign=top width=50%| [[Image:Accelerator_Port_Location.jpg]]
|valign=top| [[Image:Accelerator_Port.png]]
|}

 

== Real Time Clock (RTC) ==

{| width=100%
|valign=top width=50%| [[Image:RTC_Port_Location.jpg]]
|valign=top| [[Image:RTC_Port.png]]
|}

File:Next Digital Port.png

2019-07-02T09:53:58Z

Phoebus:

Next Digital Video Port

Circuit Diagrams

2019-07-02T09:51:51Z

Phoebus:

== J13 - Daughter board connector ==

{| width=100%
|valign=top width=50%| [[Image:DaughterLocation.jpg]]
|valign=top| [[Image:Circuit_daughter_board.png]]
|}

 

== J15 - Next GPIO ==

{| width=100%
|valign=top width=50%| [[Image:NEXT_GPIO_location.jpg]]
|valign=top width=50%| [[Image:NEXT_GPIO.png|461px]]
|}

 

== CN5 - Expansion bus (edge connector) ==

{| width=100%
|valign=top width=50%| [[Image:Expansion_bus_location.jpg]]
|valign=top| [[Image:Expansion_bus.png|461px]]
|}

 

== J10/J11 - Memory Expansion Ports ==

{| width=100%
|valign=top width=50%| [[Image:Mem_Expansion_location.jpg]]
|valign=top| [[Image:Mem_Expansion.png|461px]]
|}

 

== J4/J7 J8/J14 - Joystick Ports ==

{| width=100%
|valign=top width=50%| [[Image:Joystick_Ports_Location.jpg]]
|valign=top| [[Image:Joystick_Ports.png]]
|}

 

== CN1 - VGA Video Port ==

{| width=100%
|valign=top width=50%| [[Image:Video_Port_Location.jpg]]
|valign=top| [[Image:Video_Port.png]]
|}

 

== CN8 - Digital Port ==

{| width=100%
|valign=top width=50%| [[Image:HDMI_Port_Location.jpg]]
|valign=top|
|}

 

== CN2/CN6/CN7 - SD Reader (Mainboard) (CN6 on reverse) ==

{| width=100%
|valign=top width=50%| [[Image:SD_Reader_Port_Location.jpg]]
|valign=top| [[Image:SD_Reader_Main.png]]
|}

 

== CN10/CN11/CN12 - SD Reader (Daughterboard) (CN12 on reverse) ==

{| width=100%
|valign=top width=50%| [[Image:SD_Reader_Daughter_Port_Location.jpg]]
|valign=top| [[Image:SD_Reader.png]]
|}

 

== Accelerator Board ==

{| width=100%
|valign=top width=50%| [[Image:Accelerator_Port_Location.jpg]]
|valign=top| [[Image:Accelerator_Port.png]]
|}

 

== Real Time Clock (RTC) ==

{| width=100%
|valign=top width=50%| [[Image:RTC_Port_Location.jpg]]
|valign=top| [[Image:RTC_Port.png]]
|}

Circuit Diagrams

2019-07-02T09:37:53Z

Phoebus:

== J13 - Daughter board connector ==

{| width=100%
|valign=top width=50%| [[Image:DaughterLocation.jpg]]
|valign=top| [[Image:Circuit_daughter_board.png]]
|}

 

== J15 - Next GPIO ==

{| width=100%
|valign=top width=50%| [[Image:NEXT_GPIO_location.jpg]]
|valign=top width=50%| [[Image:NEXT_GPIO.png|461px]]
|}

 

== CN5 - Expansion bus (edge connector) ==

{| width=100%
|valign=top width=50%| [[Image:Expansion_bus_location.jpg]]
|valign=top| [[Image:Expansion_bus.png|461px]]
|}

 

== J10/J11 - Memory Expansion Ports ==

{| width=100%
|valign=top width=50%| [[Image:Mem_Expansion_location.jpg]]
|valign=top| [[Image:Mem_Expansion.png|461px]]
|}

 

== J4/J7 J8/J14 - Joystick Ports ==

{| width=100%
|valign=top width=50%| [[Image:Joystick_Ports_Location.jpg]]
|valign=top| [[Image:Joystick_Ports.png]]
|}

 

== CN1 - VGA Video Port ==

{| width=100%
|valign=top width=50%| [[Image:Video_Port_Location.jpg]]
|valign=top| [[Image:Video_Port.png]]
|}

 

== CN8 - Digital Port ==

{| width=100%
|valign=top width=50%| [[Image:HDMI_Port_Location.jpg]]
|valign=top| [[Image:HDMI_Port.png]]
|}

 

== CN2/CN6/CN7 - SD Reader (Mainboard) (CN6 on reverse) ==

{| width=100%
|valign=top width=50%| [[Image:SD_Reader_Port_Location.jpg]]
|valign=top| [[Image:SD_Reader_Main.png]]
|}

 

== CN10/CN11/CN12 - SD Reader (Daughterboard) (CN12 on reverse) ==

{| width=100%
|valign=top width=50%| [[Image:SD_Reader_Daughter_Port_Location.jpg]]
|valign=top| [[Image:SD_Reader.png]]
|}

 

== Accelerator Board ==

{| width=100%
|valign=top width=50%| [[Image:Accelerator_Port_Location.jpg]]
|valign=top| [[Image:Accelerator_Port.png]]
|}

 

== Real Time Clock (RTC) ==

{| width=100%
|valign=top width=50%| [[Image:RTC_Port_Location.jpg]]
|valign=top| [[Image:RTC_Port.png]]
|}

GPIO Socket (J15)

2019-06-25T12:02:25Z

Phoebus:

The GPIO socket, marked J15 on the circuit board, allows access to several different power and data lines:

* I2C serial protocol
* UART
* Spare pins on the FPGA
* 5v, 3.3v and GND

The UART is also used for the ESP Wi-fi module, and can't be used from the GPIO without removing the ESP module. I2C is also used to communicate with the real time clock module.

The GPIO is not populated and requires a socket to be installed (2 x 10 IDC 2.54mm spc. Male Pin Header). Pull up/down resistors may be required for some pins to limit current.

[[Image:NEXT GPIO location.jpg|thumb|J15 position on circuit board]]
[[Image:NEXT_GPIO.png|thumb|GPIO pinout image]]

In June 2019 it was announced that pins 4 and 17 of J15 would be used for two additional keyboard connections on full cased Nexts. Final specs have not yet been finalised.

GPIO Socket (J15)

2019-06-25T11:52:47Z

Phoebus:

The GPIO socket, marked J15 on the circuit board, allows access to several different power and data lines:

* I2C serial protocol
* UART
* Spare pins on the FPGA
* 5v, 3.3v and GND

The UART is also used for the ESP Wi-fi module, and can't be used from the GPIO without removing the ESP module. I2C is also used to communicate with the real time clock module.

The GPIO is not populated and requires a socket to be installed (2 x 10 IDC 2.54mm spc. Male Pin Header). Pull up/down resisters may be required for some pins to limit current.

[[Image:NEXT GPIO location.jpg|thumb|J15 position on circuit board]]
[[Image:NEXT_GPIO.png|thumb|GPIO pinout image]]

In June 2019 it was announced that pins 4 and 17 of J15 would be used for two additional keyboard connections on full cased Nexts. Final specs have not yet been finalised.