Kaypro disassembled and commented

Elements analysed

ROMS:

• 81-149c: * KAYPRO II * downloaded from Retroarchive
• 81-232: * KAYPRO * dumped from my Kaypro, support for double side disks.
• omni2: * Omni II * like the 81-232 with changes on the character handling.

CP/M BIOS:

• CP/M 2.2 F for ROM 81-149: KAYPRO II 64k CP/M vers 2.2 From kpii-149 in retroarchive. Identical to CP/M 2.2 for ROM 81-232A (kpro-ii.td0).
• CP/M 2.2 F for Kaypro IV: KAYPRO IV 64k CP/M vers 2.2 From K4836765 in retroarchive. It only changes a byte on the welcome string.
• CP/M 2.2 Spanish for ROM 81-232: KAYPRO CP/M 2.2 {SPv2.72} From my collection. Has translated versions of the warm boot message and does the character translation for the Spanish keyboard
• CP/M 2.2 German for ROM 81-232: KAYPRO CP/M 2.2 {GMv2.72} From kayiiger in in z80.eu. Has translated versions of the warm boot message and does the character translation for the German keyboard

Executables

• config.com 11-July-1982: for BIOS KAYPRO II \r\n64k CP/M v 2.2
• config.com v1.1: for BIOS KAYPRO II 64k CP/M vers 2.2. Adds persistant baud rate changes
• cambio.com: Provided by the CP/M in Spanish to select how the BIOS behaves
• cambio8.com: Provided by the CP/M in Spanish to select how the BIOS behaves

Character generators

• 81-146a: Kapyro II/83, downloaded from Retroarchive
• 81-234: Kaypro II/83 International version, dumped from my Kaypro with Spanish keyboard. Replaces the Greek chars with the extra European latin chars
• Omni2: Omni II Logic Analyzer
• 81-187: Kaypro 10, higher resolution
• 81-235: Kaypro 2/84, higher resolution, identical to 81-187

References

• Kaypro II Theory of Operation
• CP/M 2.2 Alteration Guide
• FD179X-02 Datasheet
• Zilog Z80-PIO Technical Manual
• Zilog Z80-SIO Technical Manual