Tag Archives: z80

Back from the dead (almost)


hexmon BASICThe graphic you can see here is the partially recovered code of a program I wrote thirty years ago – “hexmon” – to display chunks of ZX80 memory in hexadecimal format (at least I think that’s what it did).

I am determined to fully recover it – but as you can see it works well so far and the machine code string in the middle looks particularly good – especially as I can see it ends with C9 which I know is the Z80 “return” command.

Breadboard 81


Benkid77 ZX80 Factorial
Image via Wikipedia

Not everything about computing is on the internet.

Sometime around this point thirty years ago my brother and I went to a computer exhibition in London – “Breadboard 81″

There are a couple of references to it findable through Google. But not much.

It was a fantastic experience – but perhaps also the end of an era: the computer that feature most of all was the “UK 101″ – a kit based effort with a real keyboard (unlike the ZX80 Conor and I were using).

It is impossible to describe the thrill one could get from being able to see, use and program (in either BASIC or assembler/machine code) any of these devices: everyone was a pioneer and everyone was equal. (Though this book this book captures the feel of the era that was dying even as it peaked.)

Perhaps there are others who will read this who were also there and who can share their memories of this moment… reminding me of where it even was would be a start? Olympia?