Small Computer Monitor v1.2

SCM v1.2 is currently a Beta release and is not yet being used for ‘production’ firmware.

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

Version 1.2 adds a framework to enable most configurations to be created with simple text files thus reducing the need to manage so many code files. It also makes it easier to add support for new devices, such as serial interfaces. The increased code size required to support these new features means the fully-featured monitor does not fit in an 8k ROM.

Other configurations can be found in the SCM v1.0 and SCM v1.1 distributions.

Known Bugs and Limitations

Some configurations of SCM v1.2 fail to execute idle event routines (API 0x13 to 0x16)
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 v1.2 – Source and Tools – 2020-05-28 (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

Supported Hardware

Small Computer 108 (SC108) – to be added soon
Small Computer 111 (SC111) – to be added soon
Small Computer 114 (SC114)
Small Computer 118 (SC118)
Small Computer 121 (SC121)
Small Computer 126 (SC126)
Small Computer Workshop IDE
ZORAk Mothership

For the following hardware, see SCM v1.1

For the following hardware, see SCM v1.0

Small Computer Central