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NorthStar Horizon Monitor

The NorthStar Z80 CPU board allows for 1K of firmware to be installed on a 2708 EPROM

This was an optional extra and they provided an monitor program called HDT. Although I have the upgrade the EPROM is corrupt and have not found a copy of the software on the Internet so decided to write my own.

I have blank 2708's its an early device that requires three voltages, a special programmer and some additions to the board. Plus it uses more power than modern chips. So I decided to replace it with a modern EEPROM

I found a website with a home made adaptor, and decided to design a PCB.

I can read some test code from the EEPROM on my NorthStar so next step is to decide what functions are needed, and to write and test some code.

I have PCB's available