Difference between revisions of "Z80:DevTuesday"

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(adding yesterdays harvest, at this moment just raw links to original posts and sources, maybe some categorization should happen later...)
 
(Adding two more snippets posted on Next discord)
 
(29 intermediate revisions by the same user not shown)
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==== 2024 week 12 (Mar 19) ====
 +
 +
Ped7g - 9 bytes routine calculating byte size 1,2 or 4 (C like integer types) from number of bits (A = 1..32):<br>
 +
[https://gist.github.com/ped7g/27ffe953d7af00a687dd8c9d6ea7ad6c source @github gists]<br>
 +
[https://www.facebook.com/groups/z80asm/posts/1992580414468910/ original challenge post @fb]
 +
 +
==== 2023 week 32 (Aug 10) ====
 +
 +
em00k - dot command converting SL2 images + Next Palette to 256 color BMP:<br>
 +
[https://github.com/em00k/sl2bmp source and binary @github]
 +
 +
==== 2023 week 19 (May 9) ====
 +
 +
Ped7g - Z80 quicksort array of pointers to 64 byte long strings (esxdos filenames):<br>
 +
[https://www.facebook.com/groups/SpectrumNextDev/posts/1886842855027058/ facebook post (for comments/questions)]<br>
 +
[https://gist.github.com/ped7g/5b29c9199494bf35ee5b0aeacf98df75 quicksort_strings.asm source @github gists]
 +
 +
==== 2022 week 7 (Feb 15) ====
 +
 +
Ped7g - Z80N specific optimisation of calculating address in 90 degree rotated char buffer:<br>
 +
[https://discord.com/channels/556228195767156758/686699389703422030/942746180645969981 discord post with NEX file]<br>
 +
[https://gist.github.com/ped7g/cc65958c69f08564d140ffd14a9ef715 clockwise32x32char_z80n.asm source @github gists]
 +
 +
==== 2021 week 33 (Aug 17) ====
 +
 +
Ped7g - RRCA-like nibbles rotation, both Z80N and Z80 variants:<br>
 +
[https://www.facebook.com/groups/SpectrumNextDev/posts/1443193089392039/ facebook post (for comments/questions)]<br>
 +
[https://github.com/ped7g/ZXSpectrumNextMisc/blob/master/snippets/bit_fun.i.asm source+NEX @github]
 +
 +
==== 2021 week 30 (Jul 27) ====
 +
 +
Ped7g - "modulo 192" and "modulo 40" Z80N routine:<br>
 +
[https://www.facebook.com/groups/SpectrumNextDev/posts/1429633577414657/ facebook post (for comments/questions)]<br>
 +
[https://github.com/ped7g/ZXSpectrumNextMisc/blob/master/snippets/mod192.i.asm source+NEX @github] [https://github.com/ped7g/ZXSpectrumNextMisc/blob/master/snippets/mod40.i.asm (mod 40)]
 +
 +
==== 2021 week 23 (Jun 8) ====
 +
 +
Ped7g - "modulo 320" Z80N routine:<br>
 +
[https://www.facebook.com/groups/SpectrumNextDev/permalink/1392874804423868/ facebook post (for comments/questions)]<br>
 +
[https://github.com/ped7g/ZXSpectrumNextMisc/blob/master/snippets/mod320.i.asm source+NEX @github]
 +
 +
==== 2021 week 14 (Apr 6) ====
 +
 +
Ped7g - size-optimised initialisation of longer nextreg-value pairs:<br>
 +
[https://www.facebook.com/groups/SpectrumNextDev/permalink/1350742898637059/ facebook post (for comments/questions)]<br>
 +
[https://gist.github.com/ped7g/b33111b1d91dc4441b8579831da507bc source @github gists]
 +
 +
==== 2021 week 5 (Feb 2) ====
 +
 +
Ped7g (based on Omega's code from VOID demo) - second version - ULA attributes fade in/out:<br>
 +
[https://www.facebook.com/groups/SpectrumNextDev/permalink/1307156776329005/ facebook post with video]<br>
 +
[https://gist.github.com/ped7g/ad3fb234fb800df7a22e858c4d2daf4f source @github gists]
 +
 +
==== 2021 week 2 (Jan 12) ====
 +
 +
Ped7g (based on Omega's code from VOID demo) - ULA attributes fade in/out (code-size focused):<br>
 +
[https://www.facebook.com/groups/SpectrumNextDev/permalink/1292610091117007/ facebook post]<br>
 +
[https://gist.github.com/ped7g/4bb94291ff379441494110f13825d956 source @github gists]
 +
 +
==== 2021 week 1 (Jan 5) ====
 +
 +
Ped7g (based on work and discussions of fellow Next devs) - detect Z80N CPU:<br>
 +
[https://www.facebook.com/groups/SpectrumNextDev/permalink/1290430268001656/ facebook post]<br>
 +
[https://github.com/ped7g/ZXSpectrumNextMisc/blob/master/snippets/detectZ80N.i.asm source+NEX @github]
 +
 +
==== 2020 week 51 (Dec 15) ====
 +
 +
Busy/Baze/Zilog/Ped7g - decode 5-bit-letter bitstream in 19 bytes:<br>
 +
[https://www.facebook.com/groups/SpectrumNextDev/permalink/1272923016419048/ facebook post]<br>
 +
[https://github.com/ped7g/ZXSpectrumNextMisc/blob/master/snippets/strings5bPacked.i.asm source+NEX @github]
 +
 +
==== 2020 week 45 (Nov 3) ====
 +
 +
Ped7g - displaying all 512 colours which ZX Next could produce on screen:<br>
 +
[https://www.facebook.com/groups/SpectrumNextDev/permalink/1239989036379113/ facebook post]<br>
 +
[https://github.com/ped7g/ZXSpectrumNextMisc/tree/master/ShowAll512Colors source+NEX @github]
 +
 +
==== 2020 week 44 (Oct 27) ====
 +
 +
Ped7g - assembly snippets: integer comparison and finding total number of video-lines:<br>
 +
[https://www.facebook.com/groups/SpectrumNextDev/permalink/1232468550464495/ facebook post]<br>
 +
[https://github.com/ped7g/ZXSpectrumNextMisc/tree/master/snippets source @github]
 +
 +
em00k - loadbmp various examples:<br>
 +
[https://github.com/em00k/loadbmp-asm source @github]
 +
 +
==== 2020 week 42 (Oct 13) ====
 +
 +
Ped7g - v2 of using ZX128 shadow ULA screen and nextreg $69 for "double buffering":<br>
 +
[https://gist.github.com/ped7g/59e7b3941177444ffb48ac974f3e8ba6 v2 source @github gists] - using also DMA and custom IM1 routine
 +
 +
==== 2020 week 41 (Oct 6) ====
 +
 +
Matt Davies - simple game controls (reads "OPQA space" and MD1 joystick):<br>
 +
[https://www.facebook.com/groups/SpectrumNextDev/permalink/1216026642108686/ facebook post]<br>
 +
[https://gitlab.com/-/snippets/2022943 source @gitlab snippets]
 +
 +
Matt Davies - Z80N Bit Arrays:<br>
 +
[https://www.facebook.com/groups/SpectrumNextDev/permalink/1216836478694369/ facebook post]<br>
 +
[https://gitlab.com/-/snippets/2025829 source @gitlab snippets]
 +
 +
Ped7g - using ZX128 shadow ULA screen and nextreg $69 for "double buffering":<br>
 +
[https://gist.github.com/ped7g/80fd30f8c731b9f52b3952033a6a8564 v1 source @github gists]
 +
 +
==== 2020 week 32 (Aug 4) ====
 +
 +
Ped7g - reading Atari "driving controller" on Kempston 2 port:<br>
 +
[https://www.facebook.com/groups/SpectrumNextDev/permalink/1164980020546682/ facebook post]<br>
 +
[https://github.com/ped7g/ZXSpectrumNextMisc/tree/master/ReadingAtariDrivingController source and NEX file @github]
 +
 +
==== 2020 week 22 (May 26) ====
 +
 +
Ped7g - palette fade-out effect in Layer2 320x256 mode (using linear interpolation with Bresenham algorithm):<br>
 +
[https://www.facebook.com/groups/SpectrumNextDev/permalink/1108343799543638/ facebook post]<br>
 +
[https://github.com/ped7g/ZXSpectrumNextMisc/tree/master/Layer2FadeOut source @github]
 +
 +
==== 2020 week 19 (May 5) ====
 +
 +
Ped7g - big-picture scroll in Layer2 320x256 mode:<br>
 +
[https://www.facebook.com/groups/SpectrumNextDev/permalink/1093029257741759/ facebook post]<br>
 +
[https://github.com/ped7g/ZXSpectrumNextMisc/tree/master/Layer2BigPic source @github]
 +
 +
==== 2020 week 12 (Mar 17) ====
 +
 +
Matt Davies - DMA copy and fill:<br>
 +
[https://www.facebook.com/groups/SpectrumNextDev/permalink/1055703608140991/ facebook post]<br>
 +
[https://pastebin.com/MUW6Sdqu source @pastebin]
 +
 +
==== 2020 week 11 (Mar 10) ====
 +
 +
Matt Davies - A string compare routine:<br>
 +
[https://www.facebook.com/groups/SpectrumNextDev/permalink/1050260452018640/ facebook post]<br>
 +
[https://pastebin.com/bJE20PpG source @pastebin]
 +
 +
==== 2020 week 10 (Mar 3) ====
 +
 +
em0000k - Simple Tilemap Example:<br>
 +
[https://www.facebook.com/groups/SpectrumNextDev/permalink/1045142775863741/ facebook post]<br>
 +
[https://github.com/em00k/TileMap-Example source @github]
 +
 +
Ped7g - clamping HL value to -0x100..+0x100 (16b signed math):<br>
 +
[https://gist.github.com/ped7g/b3085bef885b5b96515eea2ca27f9b19 source @gist.github]
 +
 +
==== 2020 week 8 (Feb 18) ====
 +
 +
Matt Davies - Some simple utilities:<br>
 +
[https://www.facebook.com/groups/SpectrumNextDev/permalink/1035259330185419/ facebook post]<br>
 +
[https://pastebin.com/cZyHH2hJ source @pastebin]
 +
 +
em0000k - DMA samples player (one channel, different samples in succession):<br>
 +
[https://www.specnext.com/forum/viewtopic.php?f=16&t=1520&sid=6ac453da2e2b92b6b197563d7a7d7c90 forum post]<br>
 +
[https://pastebin.com/yDkre4jA source @pastebin]
 +
 +
Chris Kirby - simple cooperative multitasking system for z80.<br>
 +
[https://www.facebook.com/groups/SpectrumNextDev/permalink/1035395633505122/ facebook post]<br>
 +
[https://pastebin.com/GFDN6ex8 source @pastebin]
 +
 +
==== 2020 week 7 (Feb 11) ====
 +
 
Matt Davies - Memory page allocation:<br>
 
Matt Davies - Memory page allocation:<br>
 
[https://www.facebook.com/groups/SpectrumNextDev/permalink/1029263027451716/ facebook post]<br>
 
[https://www.facebook.com/groups/SpectrumNextDev/permalink/1029263027451716/ facebook post]<br>
 
[https://pastebin.com/nJuaUgkc source @pastebin]
 
[https://pastebin.com/nJuaUgkc source @pastebin]
 +
[https://gitlab.com/-/snippets/2080070 "2021 variant" @gitlab]
  
 
David Saphier - DMA sample player:<br>
 
David Saphier - DMA sample player:<br>

Latest revision as of 21:16, 22 March 2024

2024 week 12 (Mar 19)

Ped7g - 9 bytes routine calculating byte size 1,2 or 4 (C like integer types) from number of bits (A = 1..32):
source @github gists
original challenge post @fb

2023 week 32 (Aug 10)

em00k - dot command converting SL2 images + Next Palette to 256 color BMP:
source and binary @github

2023 week 19 (May 9)

Ped7g - Z80 quicksort array of pointers to 64 byte long strings (esxdos filenames):
facebook post (for comments/questions)
quicksort_strings.asm source @github gists

2022 week 7 (Feb 15)

Ped7g - Z80N specific optimisation of calculating address in 90 degree rotated char buffer:
discord post with NEX file
clockwise32x32char_z80n.asm source @github gists

2021 week 33 (Aug 17)

Ped7g - RRCA-like nibbles rotation, both Z80N and Z80 variants:
facebook post (for comments/questions)
source+NEX @github

2021 week 30 (Jul 27)

Ped7g - "modulo 192" and "modulo 40" Z80N routine:
facebook post (for comments/questions)
source+NEX @github (mod 40)

2021 week 23 (Jun 8)

Ped7g - "modulo 320" Z80N routine:
facebook post (for comments/questions)
source+NEX @github

2021 week 14 (Apr 6)

Ped7g - size-optimised initialisation of longer nextreg-value pairs:
facebook post (for comments/questions)
source @github gists

2021 week 5 (Feb 2)

Ped7g (based on Omega's code from VOID demo) - second version - ULA attributes fade in/out:
facebook post with video
source @github gists

2021 week 2 (Jan 12)

Ped7g (based on Omega's code from VOID demo) - ULA attributes fade in/out (code-size focused):
facebook post
source @github gists

2021 week 1 (Jan 5)

Ped7g (based on work and discussions of fellow Next devs) - detect Z80N CPU:
facebook post
source+NEX @github

2020 week 51 (Dec 15)

Busy/Baze/Zilog/Ped7g - decode 5-bit-letter bitstream in 19 bytes:
facebook post
source+NEX @github

2020 week 45 (Nov 3)

Ped7g - displaying all 512 colours which ZX Next could produce on screen:
facebook post
source+NEX @github

2020 week 44 (Oct 27)

Ped7g - assembly snippets: integer comparison and finding total number of video-lines:
facebook post
source @github

em00k - loadbmp various examples:
source @github

2020 week 42 (Oct 13)

Ped7g - v2 of using ZX128 shadow ULA screen and nextreg $69 for "double buffering":
v2 source @github gists - using also DMA and custom IM1 routine

2020 week 41 (Oct 6)

Matt Davies - simple game controls (reads "OPQA space" and MD1 joystick):
facebook post
source @gitlab snippets

Matt Davies - Z80N Bit Arrays:
facebook post
source @gitlab snippets

Ped7g - using ZX128 shadow ULA screen and nextreg $69 for "double buffering":
v1 source @github gists

2020 week 32 (Aug 4)

Ped7g - reading Atari "driving controller" on Kempston 2 port:
facebook post
source and NEX file @github

2020 week 22 (May 26)

Ped7g - palette fade-out effect in Layer2 320x256 mode (using linear interpolation with Bresenham algorithm):
facebook post
source @github

2020 week 19 (May 5)

Ped7g - big-picture scroll in Layer2 320x256 mode:
facebook post
source @github

2020 week 12 (Mar 17)

Matt Davies - DMA copy and fill:
facebook post
source @pastebin

2020 week 11 (Mar 10)

Matt Davies - A string compare routine:
facebook post
source @pastebin

2020 week 10 (Mar 3)

em0000k - Simple Tilemap Example:
facebook post
source @github

Ped7g - clamping HL value to -0x100..+0x100 (16b signed math):
source @gist.github

2020 week 8 (Feb 18)

Matt Davies - Some simple utilities:
facebook post
source @pastebin

em0000k - DMA samples player (one channel, different samples in succession):
forum post
source @pastebin

Chris Kirby - simple cooperative multitasking system for z80.
facebook post
source @pastebin

2020 week 7 (Feb 11)

Matt Davies - Memory page allocation:
facebook post
source @pastebin "2021 variant" @gitlab

David Saphier - DMA sample player:
facebook post
source @pastebin

Robin Verhagen-Guest - Multiframe Copper program:
facebook post
source @pastebin

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