Bradley Bell

This test vector passes for the given circuit. ``` # test vector for NAND gate A B Y 0 x 1 x 0 1 1 1 0 ```

Additionally, the bit order is backwards on the parallel inputs. A load operation should place P0 on the leftmost (input) bit of the register, and P7 on the rightmost (output)...

The jumpers just go directly to your eprom's extra address lines, A8, A9 and A10, and you set them high or low to select the region of the eprom where...

I myself haven't gotten to test it yet (no disk drives), but it should work. @mengstr is your board working now?

I have built and tested my board, and it doesn't work without some rewiring, which I added to the wiki here: https://github.com/btb/DiskII/wiki/Revision-0-errata After rewiring, I tested it successfully using the...

No changes needed to the firmware, just make sure you set the jumpers A8 A9 A10 as appropriate (i.e. all LO, assuming you put the .bin files at offset 0...

The kicad project is now updated with correct wiring as well. I haven't updated the gerbers because I want to make some other changes before I release it as "revision...

Revision 1 is now, done, with gerbers here: https://github.com/btb/DiskII/releases/tag/rev1

> Thank you very much. I will make a batch for me. There are some APII needing them here! Great! Let me know how it goes, and check my notes...

> Hello from Ireland, I have ordered few PCB rev.1 but unfortunately didn’t work for me. When I power on my Apple IIe the computer beeps and jumps on the...