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Late 1977 RAM Expansion and NIM
The late-1977 release is the second public HomeComp release wave.
It introduces the official HC-77B 3K RAM Expansion and bundles it with a free NIM game cassette.
| Category | Released Material |
|---|---|
| Hardware | HC-77B 3K RAM Expansion |
| Software | NIM game cassette |
| Media | Cassette image for NIM |
The 3K RAM Expansion extends the HC-77B from its 1 KB launch configuration to the planned 4 KB working system.
Bundling NIM with the RAM expansion gives users an immediate reason to fit the board: a small playable cassette game that demonstrates the machine moving beyond pure front-panel experimentation into practical loaded software.
The 3K RAM Expansion completes the HC-77B's initial official RAM expansion path.
| Item | Detail |
|---|---|
| Product | HC-77B 3K RAM Expansion |
| Adds | 3 KB RAM |
| Resulting total RAM | 4 KB |
| Address range | $0400-$0FFF |
For the wider HC-77B memory map, see HC-77B Technical Overview.
The NIM cassette is bundled free with the 3K RAM Expansion.
It is the first public HomeComp cassette software release for the HC-77B.
| Item | Detail |
|---|---|
| Product | NIM cassette |
| Type | Game |
| Media | Cassette |
| Bundle | Free with HC-77B 3K RAM Expansion |
| Release period | Late November / early December 1977 |
This release marks the first expansion of the HC-77B ecosystem after the September 1977 launch.
It adds:
- the first official RAM expansion
- the first official cassette software
- the first bundled hardware/software product
- a practical demonstration of cassette-loaded HC-77B software
The next planned public release phase is March/April 1978.
That release will focus on:
- Advanced Monitor Tools Cassette
- HC Cassette BASIC Cassette