Having become more and more interested in the computers that started it all for me, I've been poking (geddit?) around in my attic among my collection of 8-bit computers, running emulators and buying hardware (leads and adaptors) and starting to use some of these machines again.
I have quite a collection - there was a time when you could easily find them at car boot sales for a fiver, and I think that one of the Vic20s I have is the one I was given as a teenager.
I've always thought that I'd return to these computers, maybe in retirement, but it's happened a bit sooner.
Back to the point. I've begun writing a game for C64. I couldn't help myself. After much searching of the attic, I couldn't find a copy of the C64 Programmer's Reference Guide. I easily found it as a scanned pdf online, which is fine, but it's harder to use that than simply flicking through the pages of a book. (I will buy a copy, they come up on eBay. No doubt I will then find a copy I already owned.)
One of the things I really wanted was a reference guide for the instruction set. Although the C64 has a 6510 processor and the Vic20 a 6502, the two processors are identical but for a small difference. And I did find a Vic20 Prog Ref Guide, and the instruction set reference is identical.
It's very well-thumbed - I was as obsessed with programming as I am now. This is clearly my own original copy. It has some lined A4 with notes in my handwriting. It feels weird handling the book, a little bit like I've gone back 38 years in time, grabbed the book and brought it back with me.
As part of my foray into this new-old world, I've discovered that there are some amazing people producing hardware and games (on cartridge/disc/tape) for these old computers. To support and encourage that, I've begun this project.