Concurrent CP/M-86 & Concurrent DOS Y2K Patches

This projects regroups patch versions of Concurrent Y2K OS utilties. It is also the premises for a full rebuild of Concurrent CP/M-86 3.1 starting with independent utilities.

Currently the supported OSes are

• Concurrent CP/M-86 3.1
• Concurrent DOS 3.2
• Concurrent DOS 4.1
• DOS Plus 1.2

Only the PC/XT/AT targets have been tested. I suspect they should work with compupro or others too. I plan to simulators for compupro and rc759 but any help would be welcome.

Utility	CCP/M 3.1	CDOS 3.2	CDOS 4.1	DOS Plus 1.2
SDIR	Fixed	Fixed	Fixed	Fixed
DATE	Fixed	Compliant	Compliant	Compliant
SHOW	Fixed	Fixed	Compliant	Compliant
TOD	Fixed	Fixed	Compliant	Compliant

• Fixed indicates that one of the tools need to be updated on the OS distribution.

• Concurrent DOS XM 6.21 seems fully compliant

You can go to https://github.com/tsupplis/cpm86-kernel and https://github.com/tsupplis/cpm86-hacking for CP/M-86 1.1 Y2K compliance.

Where to find CP/M-86 and Concurrent CP/M-86?

The source for CP/M-86 and Concurrent CP/M-86, sources and binaries is http://www.cpm.z80.de.

A cleaned-up distribution and kernel is available at https://github.com/tsupplis/cpm86-kernel. This distribution is working well in virtual environments, patched with all known patches, 'y2k' friendly (it contains the version of tod which sources are in this project) and AT friendly.

Repository Layout

Directory	Contents
tools/	PL/M-86 / ASM-86 / PL/I-86 / C sources for the Y2K-patched CP/M-86 utilities
asm/	Sources for ASM86, DRI's native CP/M-86 8086 assembler (self-hosted, runs under CP/M-86)
ddt86/	Sources for DDT86, the CP/M-86 debugger, and its companion disassembler/table-generator
xios31/	XIOS sources for Concurrent CP/M-86 3.1 (no standalone .cmd; produces .h86/.lib)
doc/	Reference documentation (the RASM-86/LINK-86/LIB-86 Programmer's Utilities Guide)

Each of tools/, asm/, ddt86/ and xios31/ has its own Makefile, and a top-level Makefile drives all of them.

Utilities

The tools/ directory builds the following CP/M-86 .cmd executables. The Y2K-patched tools are listed in the compliance table above.

Binary	Description
date.cmd	Date display/set utility (Y2K fixed)
dir.cmd	Directory listing
ed.cmd	Line editor
era.cmd	File erase utility
eraq.cmd	File erase with query
gencmd.cmd	Generate .cmd from .h86
help.cmd	Help utility
pip3.cmd	Peripheral interchange program (v3)
pip4.cmd	Peripheral interchange program (v4)
ren.cmd	File rename utility
sdir.cmd	Extended directory (Y2K fixed)
set.cmd	File attribute set utility
show.cmd	Disk space display (Y2K fixed)
submit.cmd	Submit batch file utility
systat.cmd	System status utility
tcopy.cmd	Track copy utility
tod.cmd	Time-of-day utility
type.cmd	File type/display utility
vcmode.cmd	Video console mode utility
chset.cmd	Process config utility
initdir.cmd	Directory initialization utility
genccpm.cmd	CCP/M generation tool

The asm/ directory builds asm86.cmd, DRI's native CP/M-86 8086 assembler.

The ddt86/ directory builds:

Binary	Description
ddt86.cmd	DDT86 dynamic debugging tool
gentab.cmd	Opcode table generator for the disassembler

Sources and Build

The sources are written in Intel PL/M-86 and ASM-86.

Dependencies

The build relies on the cross-development toolchain from:

• cpm86-crossdev — provides all required build tools: the Intel PL/M-86 compiler, assemblers, linker, and CP/M-86 build utilities (intel_plm86, cpm_asm86, cpm_gencmd, pcdev_rasm86, pcdev_linkcmd, pcdev_lib86, drpli_pc, drpli_link, drccpm_cc, drccpm_link)

Building

Build everything from the repository root:

make

This recurses into tools/, asm/, ddt86/ and xios31/. You can also build each independently:

cd tools && make
cd asm && make
cd ddt86 && make
cd xios31 && make

The top-level Makefile targets:

• all — builds all .cmd binaries in every subdirectory (default)
• clean — removes all generated object and binary files in every subdirectory
• dist — collects every .cmd from all subdirectories into a single flat dist.zip

The tools/Makefile additionally builds low-level snippets (boot.h86, load.h86, lbdos.h86, lbdos3.sys) and a ccpmtest.img test CP/M disk image with all tools copied onto it.

Code Pattern Fixed for Y2K

The fix applied across all affected tools is the same — a year overflow correction on date display:

emit$date$time: procedure;
    if tod.opcode = 0 then
      do;
      call emitn(.day$list(shl(week$day,2)));
      call emitchar(' ');
      end;
    call emit$slant(month);
    call emit$slant(day);
    if year>99 then
    do;
        year=year-100;
    end;
    call emit$bin$pair(year);
    call emitchar(' ');
    call emit$colon(hrs);
    call emit$colon(min);
    if tod.opcode = 0 then
      call emit$bcd$pair(sec);
    end emit$date$time;

The fix is on date display > 99. The date command code is just a bit more involved. The fixes mimic the Y2K fixes of CP/M 3.0 for 8080.

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Companion projects

Project	Description
cpm86-kernel	CP/M-86 1.1 distribution rebuilt from patched and reconstituted sources
ccpm86-y2k	CCP/M-86 3.1 distribution rebuilt from patched and reconstituted sources
cpm86-crossdev	Unix CP/M-86 cross development project (compilers, emulation and tools)
cpm86-hacking	CP/M-86 miscellaneous tools and PCE emulator helpers
cpm86-cmdtools	CP/M-86 .cmd file manipulation tools
cpm86-ports	CP/M-86 application ports in C and assembler
cpm86-vi	STevie vi port for CP/M-86 and PC-DOS 1.1
pcdos11-hacking	PC-DOS 1.1 distribution, tools and notes