|k1.spdns.de / Vintage / Sinclair / 80 / Sinclair ZX81 / 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 original, buggy, first version of the ROM as shipped by Sinclair.
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).
This is a debugged variant by Geoff Wearmouth www.wearmouth.demon.co.uk/.
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.
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/ .
|Skywave Forth Rom/||2008-09-14 16:11||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|
|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||283|
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