CP M Support

As of 2020-01-20, the #FujiNet firmware has support for CP/M, via the excellent RunCPM software emulation layer. This provides a Z80 CPU, and enough of an emulation core to run almost all CP/M programs, with the Atari acting as a terminal.

Setting up CP/M Support

Currently, CP/M support is limited to the local SD card slot. You'll need to create folders in this structure (starting from the root of the SD card!), and place your CP/M files into them.

/CPM/<capital drive letter>/<user number>/

So for example, two drives with some user areas would look like:

• /CPM
  • A/
    • 0/
      • ED.COM
      • WS.COM
      • ...
    • 1/
      • WORK.DOC
      • TEST.BAS
      • ...
    • 2/
    • ...
    • 15/
  • B/
    • 0/
    • ...
    • 15/
    • ...

It really is that simple, copy the files you want, into the folder structure, and CP/M will see them in those drives at those user areas.

Remember:

• CP/M can handle drives A to P.
• CP/M can handle user areas 0 to 15.

Are there any archives of software?

RunCPM's developer, has provided a ZIP File containing 150 megabytes of CP/M programs and utilities, here: https://github.com/MockbaTheBorg/RunCPM

Directory of The Big RunCPM ZIP

How to access CP/M?

You can access CP/M with a suitable terminal program, in one of two ways:

• DT-80, which sends an SIO command to start CP/M
• An Atari MODEM program working over R:, start CPM with the command ATCPM

How does DT-80 start CP/M?

Note For Terminal Programmers: DT-80 starts CP/M by issuing the following SIO command:

DDEVIC = $5A ('Z')
DUNIT = 1
DCOMND = $47 ('G') (for GO)
DSTATS = $00 (No payload)
DBUF = $00 (no buffer)
DTIMLO = $0F (default timeout)
DBYT = $00 (no payload)
DAUX1 = $00
DAUX2 = $F0  ($F000 = Z80 address of boot ROM, not used by FujiNet.)

Then call SIOV ($E459)