Upgrade ZX-80 compatible 4K ROM to ZX-81 compatible 8K ROM. The MicroAce scrambled several data lines, so it requires an equally scrambled ROM.
8K BASIC ROM
The Authoritative Website for Timex/Sinclair Computers
The Authoritative Website for Timex/Sinclair Computers
Upgrade ZX-80 compatible 4K ROM to ZX-81 compatible 8K ROM. The MicroAce scrambled several data lines, so it requires an equally scrambled ROM.