Subj : Re: RetroShield for Arduino
To   : Jeff
From : Jeff
Date : Sat Jan 22 2022 11:10:09

On 10 Jan 2022, Jeff said the following...
 Je> I ordered from NextPCB.com and submitted the gerber files located here:
 Je> https://gitlab.com/8bitforce/retroshield-hw/-/tree/master/manufacturing
 Je> (the gerber files are in a zip file within each processor-specific
 Je> directory).
 Je> 
 Je> I'll let you know how the final boards turn out, if anyone is interested
 Je> in doing the same. Assembly of the boards does require acquiring and
 Je> soldering a few smd components (resistors and capacitors), as well as a
 Je> processor-appropriate socket (if desired), an LED, an 18x2 male header,
 Je> 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.

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