The 6809 CPU board is alive! This evening I put SBUG into an EPROM and put it into the board, hit reset and started running a memory test…
The assembled board, complete with lifted pins and one visible jumper; the rest of the jumpers are on the back:
The final boards will have about the same layout. Lower right has the 8K EPROM and 128K RAM. Lower left is the baud rate generator and associated configuration jumpers and buffers. Above it is the reset logic, and memory decode. The rest of the board is the 6809 and it’s support logic to make it all work. Oh, and a friendly green power indicator LED in the upper right
The motherboard is an engineering prototype of the 6800/6809 capable mobo that can support either processor type with jumpers.
It’s still not completely done. The other bank of memory still needs to be tested, along with the mapping of the A16-A19 address lines to the SS-50C bus. Once those are done, it’ll be time for final clean-up of the artwork and then ordering production boards.
If you can, please come to VCF East and see both the 6800 and 6809 CPU boards in action!