For comparison here is an original SWTPC MP-C board.
Differences between the Original and Reproduction
The MP-C was only used with the SWTPC 6800 and was never used with the 6809. This MP-C will work with a 2 MHZ 6800 processor as long as the 6821 is a "B" grade part.
Baud rates are limited to 110 or 300 baud, since RS232 terminals were rare and most of the early 6800 systems were connected to Teletype printers for a terminal.
Downloads
MP-C AssemblyInstructions.pdf Original SWTPC MP-C instructions
MP-C_Schematic.pdf Original SWTPC Schematic
MP-C-Bare | MP-C Bare Board | $7 |
MP-C-ASM | MP-C Assembled - Only RS232 portion is tested. No testing on teletype and cassette interface | $39 |