The Small Computer Monitor is a classic machine code monitor for Z80 based systems.

Version 1.1 cleans up the interface between the monitor and the BIOS sections. Only a few of the configurations of SCM have currently been ported to this codebase. Other configurations can be found in the SCM v1.0 distribution.

• SCM v1.1 – Description
• SCM v1.1 – Configurations
• SCM v1.1 – Porting Guide
• SCM v1.1 – Reference
• SCM v1.1 – Apps

Known Bugs and Limitations

• Single stepping does not execute instructions that result in the program counter not changing, such as DJNZ when B > 1 and the relative jump is to itself

Downloads

• SCM v1.1 – Source and Tools – 2019-09-07 (ZIP)
  • Pre-built ROM images (HEX files) can be found in the folder: SCWorkshop\SCMonitor\Builds
  • Detailed documentation can be found in the folder: SCWorkshop\SCMonitor\Documentation

• SCM v1.0 documentation is still valid
  • SCM v1.0 – Tutorial, edition 1.0.0 (PDF)
  • SCM v1.0 – User Guide, edition 1.0.0 (PDF)

Older Versions

• Small Computer Monitor v1.0

Supported Hardware

• Small Computer 126 (SC126)
• Small Computer Workshop IDE

For the following hardware, see SCM v1.0

• Bill Shen’s Z280RC, ZZ80RC, Z80SBC64 and Z80MB64
• LiNC80 official systems
• RC2014 official systems
• Small Computer 101 (SC101)
• Small Computer 108 (SC108)
• Small Computer 111 (SC111)
• Small Computer 114 (SC114)
• Small Computer 118 (SC118)
• Small Computer Workshop IDE
• Tom Szolyga’s SBC version C
• Z80 Small Computer (Z80sc)