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CPM-65 APPLE II Port
===========
Dietrich Lausberg <[email protected]>
https://github.com/dietrich-l
This repository contains the Apple II Port of CPM-65, 
a CP/M-80 analogue operating system for 6502 based microcomputers


System Requirements

Apple II
80 Column card in Slot 3
min 1 Floppy drive
My system is a vanilla Apple II clone
Emulation

AppleWin emulator, APPLE IIe emulation due to the 80 col card


  System Structure

CPM-65 consists of 3 layers:

BIOS Basic I/O system - Drives can be A-D non consecutive.
BDOS Basic disc operating system - this is the CPM-65 kernel. Size 2 kB
CCP Console command program - a simple console which only allows to invoke CPM-65 programs. 
    No resident commands. Size 1 kB

In track 0, sector 0 resides a 256 bytes BOOT program, which loads CPM-65 to memory 
and starts the CCP. 

The system can boot from Slot# 6 or 5 (Drives A: or C:)


  File & Disc Format


Filenames are CP/M-style d:filename.ext with d <Drive A-H>
Programs must have .COM as extension and are loaded to $0800 and started there.
The directory structure is nearly CP/M-compatible. 
Disk images can be read with appropriate tools 
like CPMTOOLS, CIFE (CPM Image File Explorer) or CpmtoolsGUI.
A disdefs file is in the IMAGES section. 
Please use an actual version as parameter 'extentsize 4096' is needed.
For the transfer of larger files, see separate documentation.
The Disc format is 35 tracks/ 16 sectors/ 256 byte/sector. 
It is defined in the BIOS. The BDOS operates on sector numbers.

Software List

All software is supplied as assembler files to be assembled with the CPM-65 assembler. 
In case you wish to use a different assembler, the syntax has to be adapted accordingly.

Documentation

Currently the documentation of CPM-65 is sparse and only for my personal needs. 
I plan to write appropriate docs over time. If there are any whishes, please open a DISCUSSION
Errors

The Apple port of CPM-65 is currently work in progress. Expect errors and crashes.
The CPM-65 system itself has now seen more than 30 years of service. 
Currently there are no known errors.
However, since an error free software does not exist, 
please report any errors in the ISSUE section
Other related systems

When I started the development of cpm-65, I was blissfully unaware of any other aproaches. 
However there are some, most notably:

DOS/65 by Richard Leary. There is a limited compatibility
OUP/M  by Jiang - Xiong Shao. Published 1983, no further development
CPM65 by David Given, published 2022

Redistribution

Source code, and all documents, are freely redistributable in
any form. Please see the the COPYRIGHT file included in this
Repository.