SpecNext Wiki - Recent changes [en-gb]

Emulators

Jorgegv — Thu, 30 Jul 2026 03:26:54 GMT

← Older revision		Revision as of 04:26, 30 July 2026
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	\|[https://mdf200.itch.io/cspect CSpect]\|\|[https://lemmings.info/about/ Mike Dailly]\|\|[[CSpect:known bugs\|List]]\|\|Emulates many features of the Next and includes a fully featured debugger, complete with 24bit breakpoints and an assembler\|\|Windows ([https://lemmings.info/installing-cspect-on-a-mac/ mac]/[[Development_Tools:Linux_setup##CSpect_emulator\|linux]] with mono - mostly works)\|\|No\|\|[https://www.patreon.com/posts/crash-and-cspect-143597332 Statement of maintenance and support]		\|[https://mdf200.itch.io/cspect CSpect]\|\|[https://lemmings.info/about/ Mike Dailly]\|\|[[CSpect:known bugs\|List]]\|\|Emulates many features of the Next and includes a fully featured debugger, complete with 24bit breakpoints and an assembler\|\|Windows ([https://lemmings.info/installing-cspect-on-a-mac/ mac]/[[Development_Tools:Linux_setup##CSpect_emulator\|linux]] with mono - mostly works)\|\|No\|\|[https://www.patreon.com/posts/crash-and-cspect-143597332 Statement of maintenance and support]
	\|-		\|-
	\|[https://github.com/jorgegv/jnext JNext]\|\|[https://github.com/jorgegv Jorge González]\|\| \|\|An emulator with debugger and automated control for CI/CD. Currently in beta.\|\|Any\|\|[https://github.com/jorgegv/jnext Yes]\|\|Yes		\|[https://github.com/jorgegv/jnext JNext]\|\|[https://github.com/jorgegv Jorge González]\|\| [https://github.com/jorgegv/jnext/issues List] \|\|An emulator with debugger and automated control for CI/CD. Currently in beta.\|\|Any\|\|[https://github.com/jorgegv/jnext Yes]\|\|Yes
	\|-		\|-
	\|[https://www.mamedev.org/ MAME]\|\|[https://github.com/holub holub] (Next), many contributors (MAME)\|\|[[MAME:known bugs\|List]]‎\|\|Mature multi-system emulator with good Next support. See [[MAME:Installing\|installation notes]].\|\|Any\|\|[https://github.com/mamedev/mame Yes]\|\|Yes		\|[https://www.mamedev.org/ MAME]\|\|[https://github.com/holub holub] (Next), many contributors (MAME)\|\|[[MAME:known bugs\|List]]‎\|\|Mature multi-system emulator with good Next support. See [[MAME:Installing\|installation notes]].\|\|Any\|\|[https://github.com/mamedev/mame Yes]\|\|Yes

Memory map

Johnnyo — Wed, 29 Jul 2026 21:03:39 GMT

added NextRegNo|$8E note

← Older revision		Revision as of 22:03, 29 July 2026
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	In addition, in 8k-slots 0 and 1 only, the ROM can be paged in by selecting the otherwise nonexistent 8k-page $FF. Whether the high or the low 8k of the ROM is mapped is determined by which 8k-slot is used.		In addition, in 8k-slots 0 and 1 only, the ROM can be paged in by selecting the otherwise nonexistent 8k-page $FF. Whether the high or the low 8k of the ROM is mapped is determined by which 8k-slot is used.

			Also note that since core 3.1.1 there's {{NextRegNo\|$8E}}, and it affects the same memory mapping aspects as explained in 128-style memory management and all the related ports .

	=== Interactions between paging methods ===		=== Interactions between paging methods ===

Memory Mapping Register

Johnnyo — Wed, 29 Jul 2026 20:59:12 GMT

slight reformatting

Emulators

Johnnyo — Fri, 24 Jul 2026 09:58:47 GMT

emulation of non-next targets out of scope of here

← Older revision		Revision as of 10:58, 24 July 2026
(2 intermediate revisions by the same user not shown)
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	\|-		\|-
	\|[https://mdf200.itch.io/cspect CSpect]\|\|[https://lemmings.info/about/ Mike Dailly]\|\|[[CSpect:known bugs\|List]]\|\|Emulates many features of the Next and includes a fully featured debugger, complete with 24bit breakpoints and an assembler\|\|Windows ([https://lemmings.info/installing-cspect-on-a-mac/ mac]/[[Development_Tools:Linux_setup##CSpect_emulator\|linux]] with mono - mostly works)\|\|No\|\|[https://www.patreon.com/posts/crash-and-cspect-143597332 Statement of maintenance and support]		\|[https://mdf200.itch.io/cspect CSpect]\|\|[https://lemmings.info/about/ Mike Dailly]\|\|[[CSpect:known bugs\|List]]\|\|Emulates many features of the Next and includes a fully featured debugger, complete with 24bit breakpoints and an assembler\|\|Windows ([https://lemmings.info/installing-cspect-on-a-mac/ mac]/[[Development_Tools:Linux_setup##CSpect_emulator\|linux]] with mono - mostly works)\|\|No\|\|[https://www.patreon.com/posts/crash-and-cspect-143597332 Statement of maintenance and support]
			\|-
			\|[https://github.com/jorgegv/jnext JNext]\|\|[https://github.com/jorgegv Jorge González]\|\| \|\|An emulator with debugger and automated control for CI/CD. Currently in beta.\|\|Any\|\|[https://github.com/jorgegv/jnext Yes]\|\|Yes
	\|-		\|-
	\|[https://www.mamedev.org/ MAME]\|\|[https://github.com/holub holub] (Next), many contributors (MAME)\|\|[[MAME:known bugs\|List]]‎\|\|Mature multi-system emulator with good Next support. See [[MAME:Installing\|installation notes]].\|\|Any\|\|[https://github.com/mamedev/mame Yes]\|\|Yes		\|[https://www.mamedev.org/ MAME]\|\|[https://github.com/holub holub] (Next), many contributors (MAME)\|\|[[MAME:known bugs\|List]]‎\|\|Mature multi-system emulator with good Next support. See [[MAME:Installing\|installation notes]].\|\|Any\|\|[https://github.com/mamedev/mame Yes]\|\|Yes
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	\|[https://github.com/ped7g/zesarux/tree/tbblue_small_fixes2 ZESERUse]\|\|César Hernández Bañó, [https://github.com/ped7g Peter Helcmanovsky]\|\|[[ZESERUse:known bugs\|List]]\|\|Fork of older ZEsarUX 8.2 with improved emulation accuracy of (rather old) core 3.1.5\|\|Any\|\|[https://github.com/ped7g/zesarux/tree/tbblue_small_fixes2 Yes]\|\|Rarely		\|[https://github.com/ped7g/zesarux/tree/tbblue_small_fixes2 ZESERUse]\|\|César Hernández Bañó, [https://github.com/ped7g Peter Helcmanovsky]\|\|[[ZESERUse:known bugs\|List]]\|\|Fork of older ZEsarUX 8.2 with improved emulation accuracy of (rather old) core 3.1.5\|\|Any\|\|[https://github.com/ped7g/zesarux/tree/tbblue_small_fixes2 Yes]\|\|Rarely
	\|-		\|-
	\|[http://www.desdes.com/products/oldfiles/zeus.htm Zeus]\|\|[https://www.desdes.com/ Simon Brattel]\|\| \|\| A PC cross-assembler which includes an IDE ~~and Spectrum 48/128/+2/+3 emulator~~. Includes support for Next MMU banking, sprites and UART only, with remote debugging on Next hardware.\|\|Windows\|\|No\|\|No		\|[http://www.desdes.com/products/oldfiles/zeus.htm Zeus]\|\|[https://www.desdes.com/ Simon Brattel]\|\| \|\| A PC cross-assembler which includes an IDE. Includes support for Next MMU banking, sprites and UART only, with remote debugging on Next hardware.\|\|Windows\|\|No\|\|No
	\|-		\|-
	\|[https://github.com/conorarmstrong/zx_go zx_go]\|\|Conor Armstrong\|\| \|\|An emulator written in Go. Early in development but improves. Its documentation still claims more than it actually does: many games don't run or run wrong, even the simple ones. (Note: The status of emulation of non-Next Spectrums irrelevant for this wiki -- hundreds of emulators are intentionally not listed). \|\|Any\|\|[https://github.com/conorarmstrong/zx_go Yes]\|\|Yes		\|[https://github.com/conorarmstrong/zx_go zx_go]\|\|Conor Armstrong\|\| \|\|An emulator written in Go. Early in development but improves. Its documentation still claims more than it actually does: many games don't run or run wrong, even the simple ones. (Note: The status of emulation of non-Next Spectrums irrelevant for this wiki -- hundreds of emulators are intentionally not listed). \|\|Any\|\|[https://github.com/conorarmstrong/zx_go Yes]\|\|Yes
	\|-
	\|[https://github.com/jorgegv/jnext JNext]\|\|[https://github.com/jorgegv Jorge González]\|\| \|\|A multiplatform ZX Spectrum Next emulator with lots of features for developers: exhaustive debugger, automated control for CI/CD. Currently in beta, with versions for Linux (Fedora, Ubuntu), Windows and MacOS\|\|Any\|\|[https://github.com/jorgegv/jnext Yes]\|\|Yes
	\|}		\|}

Emulators

Jorgegv — Fri, 17 Jul 2026 12:44:59 GMT

← Older revision		Revision as of 13:44, 17 July 2026
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	\|-		\|-
	\|[https://github.com/conorarmstrong/zx_go zx_go]\|\|Conor Armstrong\|\| \|\|An emulator written in Go. Early in development but improves. Its documentation still claims more than it actually does: many games don't run or run wrong, even the simple ones. (Note: The status of emulation of non-Next Spectrums irrelevant for this wiki -- hundreds of emulators are intentionally not listed). \|\|Any\|\|[https://github.com/conorarmstrong/zx_go Yes]\|\|Yes		\|[https://github.com/conorarmstrong/zx_go zx_go]\|\|Conor Armstrong\|\| \|\|An emulator written in Go. Early in development but improves. Its documentation still claims more than it actually does: many games don't run or run wrong, even the simple ones. (Note: The status of emulation of non-Next Spectrums irrelevant for this wiki -- hundreds of emulators are intentionally not listed). \|\|Any\|\|[https://github.com/conorarmstrong/zx_go Yes]\|\|Yes
			\|-
			\|[https://github.com/jorgegv/jnext JNext]\|\|[https://github.com/jorgegv Jorge González]\|\| \|\|A multiplatform ZX Spectrum Next emulator with lots of features for developers: exhaustive debugger, automated control for CI/CD. Currently in beta, with versions for Linux (Fedora, Ubuntu), Windows and MacOS\|\|Any\|\|[https://github.com/jorgegv/jnext Yes]\|\|Yes
	\|}		\|}

User:Jorgegv

Jorgegv — Fri, 17 Jul 2026 12:36:58 GMT

User account Jorgegv was created

Emulators

Johnnyo — Fri, 10 Jul 2026 05:45:26 GMT

zx_go clarify

← Older revision		Revision as of 06:45, 10 July 2026
(3 intermediate revisions by the same user not shown)
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	\|[http://www.desdes.com/products/oldfiles/zeus.htm Zeus]\|\|[https://www.desdes.com/ Simon Brattel]\|\| \|\| A PC cross-assembler which includes an IDE and Spectrum 48/128/+2/+3 emulator. Includes support for Next MMU banking, sprites and UART only, with remote debugging on Next hardware.\|\|Windows\|\|No\|\|No		\|[http://www.desdes.com/products/oldfiles/zeus.htm Zeus]\|\|[https://www.desdes.com/ Simon Brattel]\|\| \|\| A PC cross-assembler which includes an IDE and Spectrum 48/128/+2/+3 emulator. Includes support for Next MMU banking, sprites and UART only, with remote debugging on Next hardware.\|\|Windows\|\|No\|\|No
	\|-		\|-
	\|[https://github.com/conorarmstrong/zx_go zx_go]\|\|Conor Armstrong\|\| \|\|An emulator written in Go. ~~Comprehensive debugger~~. ~~Runs well~~. ~~Supports ZX80, ZX81, 48K, 128K, +2, +3, Sam Coupé,~~ Next~~, Pentagon~~. \|\|Any\|\|[https://github.com/conorarmstrong/zx_go Yes]\|\|Yes		\|[https://github.com/conorarmstrong/zx_go zx_go]\|\|Conor Armstrong\|\| \|\|An emulator written in Go. Early in development but improves. Its documentation still claims more than it actually does: many games don't run or run wrong, even the simple ones. (Note: The status of emulation of non-Next Spectrums irrelevant for this wiki -- hundreds of emulators are intentionally not listed). \|\|Any\|\|[https://github.com/conorarmstrong/zx_go Yes]\|\|Yes
	\|}		\|}

Emulators

Conorarmstrong — Thu, 09 Jul 2026 09:50:45 GMT

correct zx_go - issues now resolved.

← Older revision		Revision as of 10:50, 9 July 2026
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	\|[http://www.desdes.com/products/oldfiles/zeus.htm Zeus]\|\|[https://www.desdes.com/ Simon Brattel]\|\| \|\| A PC cross-assembler which includes an IDE and Spectrum 48/128/+2/+3 emulator. Includes support for Next MMU banking, sprites and UART only, with remote debugging on Next hardware.\|\|Windows\|\|No\|\|No		\|[http://www.desdes.com/products/oldfiles/zeus.htm Zeus]\|\|[https://www.desdes.com/ Simon Brattel]\|\| \|\| A PC cross-assembler which includes an IDE and Spectrum 48/128/+2/+3 emulator. Includes support for Next MMU banking, sprites and UART only, with remote debugging on Next hardware.\|\|Windows\|\|No\|\|No
	\|-		\|-
	\|[https://github.com/conorarmstrong/zx_go zx_go]\|\|Conor Armstrong\|\| \|\|An emulator written in Go~~, seemingly still in its early development phase~~. ~~Boots into the NextZXOS~~. ~~Fails to open the tap file~~. ~~NextBASIC Invaders game (from the distro) doesn't work~~, ~~and many other games~~.\|\|Any\|\|[https://github.com/conorarmstrong/zx_go Yes]\|\|Yes		\|[https://github.com/conorarmstrong/zx_go zx_go]\|\|Conor Armstrong\|\| \|\|An emulator written in Go. Comprehensive debugger. Runs well. Supports ZX80, ZX81, 48K, 128K, +2, +3, Sam Coupé, Next, Pentagon. \|\|Any\|\|[https://github.com/conorarmstrong/zx_go Yes]\|\|Yes
	\|}		\|}

← Older revision		Revision as of 21:59, 29 July 2026
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	bit 7 = port 0xdffd bit 0 \ RAM		bit 7 = port 0xdffd bit 0 \ RAM
	bits 6:4 = port 0x7ffd bits 2:0 / bank 0-15		bits 6:4 = port 0x7ffd bits 2:0 / bank 0-15
	R bit 3 = 1		R bit 3 = 1
	W bit 3 = 1 to change RAM bank, 0 = no change to mmu6 / mmu7 / RAM bank in ports 0x7ffd, 0xdffd		W bit 3 = 1 to change RAM bank,
			= 0 no change to mmu6 / mmu7 / RAM bank in ports 0x7ffd, 0xdffd
	bit 2 = port 0x1ffd bit 0 paging mode		bit 2 = port 0x1ffd bit 0 paging mode
	If bit 2 = paging mode = 0 (normal)		If bit 2 = paging mode = 0 (normal)
	bit 1 = port 0x1ffd bit 2 \ ROM		bit 1 = port 0x1ffd bit 2 \ ROM
	bit 0 = port 0x7ffd bit 4 / select		bit 0 = port 0x7ffd bit 4 / select
	If bit 2 = paging mode = 1 (special allRAM)		If bit 2 = paging mode = 1 (special allRAM)
	bit 1 = port 0x1ffd bit 2 \ all		bit 1 = port 0x1ffd bit 2 \ all
	bit 0 = port 0x1ffd bit 1 / RAM		bit 0 = port 0x1ffd bit 1 / RAM

	: Writes can affect all ports ~~0x7ffd~~, ~~0xdffd~~, ~~0x1ffd~~		: Writes can affect all ports {{PortNo\|$7FFD}}, {{PortNo\|$DFFD}}, {{PortNo\|$1FFD}}
	: Writes always change the ROM / allRAM mapping		: Writes always change the ROM / allRAM mapping
	: Writes immediately change the current mmu mapping as if by port write		: Writes immediately change the current mmu mapping as if by port write