I finally finished the PCB layout this week, got quotes, and ordered two prototypes of the 6809 CPU boards. They should arrive in about two weeks, then the fun begins… debugging! The boards are really dense with 21 ICs and all traces packed onto just two layers. Any boards more complicated than this will probably go to four layers. I’m proud to say that this board was routed 100% by hand… about 100 hours to do it!
Trying to get back into more software, I’ve been playing with an admittedly useless program, but it’s been fun: life for the 6800. I’m very used to thinking in terms of the 6502 addressing modes so it’s been a struggle sometimes writing 6800 code without all the 6502’s cool addressing. Once Life is done, I’ll put the code on-line. Nothing amazing, but it has been nice to program just for the fun of it.
Another project that I’ve been thinking about for many years is a KIM-1 motherboard, so over the last few weeks I’ve been jotting down notes and finally starting putting the designs into the CAD package. This idea kept coming around every time I whacked out a prototype for some board or another, usually disk drives. Besides the motherboard, I’ve also got a 1 MB RAM card; the motherboard gives four extra address bits. An EPROM card for disk I/O and maybe a BASIC interpreter is next.
I am not a sports fan, so while many people will be watching the “big game” tomorrow I’ll either be in front of the CAD package or debugging the Life program.