softwarelist
| name | description | notes |
| zx81_cass | Sinclair ZX81 cassettes | |
|
software
| name | supported | description | year | publisher | notes | cloneof |
| concentr | yes | Concentration | 1982 | International Publishing & Software Inc. | | |
|
rom
| name | size | crc | sha1 | offset | status | loadflag | value |
| Concentration.A.tzx | 821 | 312e2083 | 03d9372995e2b4827f18b3aafd9009ac97957f3a | | good | | |
| Concentration.B.tzx | 16114 | 7133e94f | f6667d8ac0a0be119a987175a03791d62faec20f | | good | | |
|
part
| name | interface |
| cass1 | zx81_cass |
| cass2 | zx81_cass |
|