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Alternative ROM for ZX Spectrum

Here are some alternative ROMs with extra features.

If you know an interesting ROM, please add a note.

EPROM instead of PROM in ZX Spectrum / TC2048

Adam £oboda

Do you wish to change your BASIC into new one or maybe do you want to replace NMI handler, add some extra drivers?

How to put own programmed EPROM memory instead of original 23128 Sinclair ROM / TIMEX ROM?

1. Take out the original 23128 ROM chip from the socket.
2. Buy new DIL 28 (precisional) SOCKET and EPROM (27C128 or 27C256).
3. Program EPROM with desired ROM image (I use GOSH WONDERFUL ROM).
4. Put EPROM chip into new DIL 28 Socket, but ATTENTION : do not connect pins 1,27,20.
5. Solder new elements ( Shottky diodes and resistors directly to pins of the new socket and EPROM chip).
6. Put all together (EPROM and new socket) into original ROM socket down on the ZX Spectrum / Timex board.

upgrade schematics


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Files for download

gw03.zip 241.1kB (2005-04-10 15:02)
Gosh Wonderful ROM by Geoff Wearmouth. Fixed bugs, tokenizer, extra commands in REM. Documentation and source included.
eprom_27128.jpg 26.7kB (2005-04-10 13:54)
Rewired EPROM in Timex Computer 2048 (by Adam £oboda).
eprom_instead_of_rom.gif 12.7kB (2005-04-10 13:54)
Schematics for EPROM by Adam £oboda.
80-lec.zip 15.1kB (2000-10-13 13:01)
Some bug fixes, build-in monitor, support for 32kB upgrade (low 32kB), extended editor with tokenizer. Documentation by Zlejko Juric.
groot.zip 21.3kB (1994-01-31 12:22)
Bug fixes, EPSON printer and Z80-PIO support, colors inverted, code for DK'Tronics lightpen. Changes by Henk de Groot. Documentation included.

Links to other pages

http://www.wearmouth.demon.co.uk/gw03/gw03.htm
Gosh Wonderful ROM by Geoff Wearmouth. Author's page with Jasper emulator.

See also

128KB - 512KB PEROM - FlashD0
128KB or 512KB PEROM (or Flash EPROM) for Spectrum compatibile computers. Can support 4MB RAM upgrade and be base for ZXVGS installation.

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CPC
4MB RAM
Flash ROM
To 128
Sam Coupé
SAM512
Portfix
YABUS.Z80RTC
Z80JOY
MSX
Mapper 4MB
MSX-2 SVI738
Spectrum
FlashD0
8251
AY
Eniac'owe
Dock
Gama 192
Keyboard
ROM replacer
SamRam
TC2144
To 128K
To +3
Wonder RAM
Z80JOY
ZX 4MB
ZXMUX
Timex
Memory
Timex FDD
YABUS.TF
YABUS.TF3
TI-of-TTL
ZX81
Memory

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© 2009-12-28 21:50 Jarek Adamski, http://8bit.yarek.pl