On 10 Jan 2022, Jeff said the following...
I ordered from NextPCB.com and submitted the gerber files located here: https://gitlab.com/8bitforce/retroshield-hw/-/tree/master/manufacturing (the gerber files are in a zip file within each processor-specific directory).
I'll let you know how the final boards turn out, if anyone is interested in doing the same. Assembly of the boards does require acquiring and soldering a few smd components (resistors and capacitors), as well as a processor-appropriate socket (if desired), an LED, an 18x2 male header, and of course a processor chip.
The PCBs arrived and I assembled one of the 1802 (COSMAC) boards. It successfully runs at about 100kHz driven by an Arduino Mega. Since the 1802 requires 8 clock cycles for each machine cycle, and most instructions take
1-2 machine cycles, this works out to about 8000 instructions per second.
The 1802 is a very unique chip, a significantly different approach to an
8-bit microprocessor than the 6502, Z80, etc.
Jeff.
--- Mystic BBS v1.12 A46 2020/08/26 (Raspberry Pi/32)
* Origin: Cold War Computing BBS (21:1/180)