Skoti

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Description

ZX Spectrum diagnostic ROM

The interface allows you to connect an external ROM. The interface uses a 64K x 8-bit memory organization system, e.g. EEPROM W27C (E) 512 - 4 banks 16KB each, switched with DIP switch, which gives us the opportunity to run 4 different ROMs. After uploading the diagnostic ROMs, it can be used as a simple diagnostic interface for repairs.

The interface will work properly with computers:

ZX Spectrum 48

ZX Spectrum 128

ZX Spectrum +2

Timex 2048

The interface does not work with ZX Spectrum 128 + 2A / B and +3 computers

Code

Project Page

https://github.com/konkotgit/ZX-external-ROM

Schematic and Layout

Schematic

https://github.com/konkotgit/ZX-external-ROM

Apr 15,2023

6,031 views

ZX Spectrum diagnostic ROM

The interface allows you to connect an external ROM that can be used as ZX Spectrum diagnostic interface.

6031

31

1

9.88 (2)

Published: Apr 15,2023

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Under the Attribution-GPL License.

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Topic

DIY Electronics

Computers & USB

ZX Spectrum Retro DIY Interface Diagnostic

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