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The Sinclair ZX81 or Timex Sinclair TS1000 ROMs

There are multiple versions of the ZX81 ROM. The ROM of the ZX81 and Timex1000 are the same. Differences between the machines, e.g. TV frame rate, are performed in software based on a PCB jumper.

The 'standard' ROM

The original, buggy, first version of the ROM as shipped by Sinclair.

The 'improved' ROM

The debugged 2nd version of the ROM as shipped by Sinclair.
The disassembly by Dr. I. Logan & Dr. Frank O'Hara was taken from Kryten's web site (no longer online).

The 'Shoulders of Giants' ROM

This is a debugged variant by Geoff Wearmouth www.wearmouth.demon.co.uk/.

Other Languages

There were several replacement ROMs available which provided different programming languages as the default powerup language: Two Forth ROMs and a Z80 assembler OS, the Aszmic ROM. The latter was only 4 kB, so i believe that it also worked for the ZX80.

Clones

Some clones had slightly modified ROMs. Currently archived are the Lambda and the Power8300 ROMs, though these machines were just differently named and otherwise identical clones.

ZX81 fans kept on working with their machine and built improved versions, which used enhanced ROMs. The ZX97 ROM is a result of these efforts. It doesn't suit the original ZX81, e.g. it is 32 kB in size.

These ROMs were copied from various sources, e.g. from Nils Eiler's homepage home.germany.net/nils.eilers/zx81/ .

Archive

	Name		Letzte Änderung		Länge
	Skywave Forth Rom/		2019-08-20 05:24		4
	aszmic (z80 assembler os).rom		2005-11-14 09:32		4096
	h4th (Forth).rom		2005-02-27 18:09		8192
	Lambda (org) (zx81 clone).rom		2005-02-27 18:09		8192
	Power8300 (org) (zx81 clone).rom		2005-02-27 18:09		8192
	tree4th (Forth).rom		2005-11-14 09:33		8192
	zx80.rom		2002-02-23 12:14		4096
	zx81 'shoulders of giants' rom source.html		2005-10-27 19:21		139466
	zx81 'shoulders of giants'.rom		2003-05-09 23:49		8192
	zx81 sysvars.pdf		2012-10-01 19:46		19372
	zx81 version 1 'standard' rom (Sinclair).rom		2001-11-27 07:14		8192
	zx81 version 2 'improved' rom (Sinclair).rom		2005-11-14 09:31		8192
	zx81 version 2 'improved' rom differences.htm		2001-12-11 08:53		42862
	zx81 version 2 'improved' rom disassembly (Logan, O'Hara).html		2005-11-07 08:59		291062
	zx81 version 2 'improved' rom source.htm		2005-10-29 18:23		417753
	zx81 version 2 'improved' rom source.txt		2014-10-18 17:36		373053
	zx97 32K enhanced ROM for an enhanced ZX81.rom		2005-02-27 18:09		32768
	Das ROM des ZX81				112

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