Banked CP/M 3 for the RC2014 80C85 Development Platform

WARNING

This is alpha test code. It may eat your disk. The on disk format might also change depending upon feedback

Introduction

This CP/M 3 build requires you are running the 8085/MMU card or compatible devices, 512K/512K flat memory card, and a 16x50 UART card at 0xC0 or an ACIA at 0xA0. The disk I/O support at this point is for 4 x 8MB drives in the first 32MB of a CF adapter or PPIDE.

Note that the CF adapter does not appear to be reliable for higher speeds with the 80C85.

Building

With the CP/M toolchain available (on either CP/M 2.x or CP/M 3, or RunCPM or similar), and ZMAC

ZMAC LDRBIOS.Z80 LINK CPMLDR[L100]=CPMLDR,LDRBIOS

ZMAC BNKBIOS3.Z80 ZMAC SCB.Z80 LINK BNKBIOS3[B]=BNKBIOS3,SCB GENCPM

(and accept what is offered from the current GENCPM.DAT)

Not Yet Supported

RC2014 Real Time Clock
Using multiple UART devices
RAMdisc for the rest of memory

Filesystem

Format the CF adapter for CP/M (eg with cpmtools) Place the 8085 CP/M bootblock (see the ROM images) on block 0 of the CF card Place CPMLDR on blocks 1+

CPM3.SYS, CCP.COM and anything else you want then goes on the A: drive which is the first 8MB. B: C: and D: are the next 8MB chunks.

Disk Layout

The 8MB file systems currently use the same layout as Bill Shen's CP/M. The relevant cpmtools definition is

diskdef rc8085
  seclen 128
  tracks 64
  sectrk 1024
  blocksize 4096
  maxdir 512
  skew 0
  boottrk 1
  os 3
end

EtchedPixels / CPM8085