The latest release of this Firmware is detailed in the table below.
| Name | Small Computer Monitor |
| Configuration | F3 |
| Release date | 2022-10-16 |
| Download ROM image | SCM F3 2022-10-16 |
| Download source code | SCW 2022-10-16 |
| Device Programming: | |
| Code size | 32k bytes |
| Checksum (MiniPro 6.6) | 07D3 8D24 (SST39SF040) |
| Recommended IC | SST39SF040 |
| Core Components: | |
| Monitor | Version 1.3.1 |
| BIOS | SCZ180 1.3.1 |
| Included Apps: | |
| – ROM BASIC | Version 4.7b.1 |
| – CP/M loader from CF card | Version 1.0 |
The ROM image is supplied (above) as an Intel HEX format file, which is suitable for use by most PROM programmers. Intel HEX files are a text format, not a binary format. As a result, they are larger than the stated code size in the table above.
Source code is supplied (above) complete with the Small Computer Workshop development environment for Windows.
The Small Computer Monitor’s Components and Apps are described here.
Diagnostic display
At reset, the 8 LEDs next to the power LED are used to display the results of the self-test diagnostics. Each LED should light for a fraction of a second and the test should end with all 8 LEDs being turned off. Failures are indicated as follows.
| Display | Issue |
| Light sequence repeats indefinitely | RAM test failed |
| LED bit 0 remains on | Serial port test failed |
| No light sequence | CPU not running, or output port failed |
Supported Devices
- Z180 CPU (eg. Z8S180xx)
- Z180 ASCI at 0xC0 (eg. Z8S180xx)
- SIO #1 at 0x80 (eg. Z84C4xxx)
- SIO #2 at 0x84 (eg. Z84C4xxx)
- CTC #1 at 0x88 (eg. Z84C30xx)
- CTC #2 at 0x8C (eg. Z84C30xx)
- ACIA #1 at 0xA2 (eg. 68B50)
- ACIA #2 at 0xA4 (eg. 68B50)
- CF Card at 0x90 for file storage
- Diagnostic LEDs and digital I/O at 0xA0
The lack of specific support does not exclude the use of other hardware. It just means the ROM does not do anything specific with it.
Supported Cards
- Serial port:
- Timer:
- Baud rate generation:
- CP/M storage:
- Self-test status display:
- SC506, Digital I/O card for Z50Bus (at 0xA0)
- Z50Bus, Digital I/O module (at 0xA0)
The lack of specific support does not exclude the use of other hardware. It just means the ROM does not do anything specific with it.
Release Notes
none
Older Releases
| Name | Small Computer Monitor |
| Configuration | F3 |
| Release date | 2022-02-27 |
| Download ROM image | SCM F3 2022-02-27 |
| Download source code | SCW 2022-03-01 |
| Device Programming: | |
| Code size | 32k bytes |
| Checksum (MiniPro 6.6) | 07D3 A07A (SST39SF040) |
| Recommended IC | SST39SF040 |
| Core Components: | |
| Monitor | Version 1.3.0 |
| BIOS | SCZ180 1.3.0 |
| Included Apps: | |
| – ROM BASIC | Version 4.7b.1 |
| – CP/M loader from CF card | Version 1.0 |
Small Computer Central 