{"id":25015555,"url":"https://github.com/hkzlab/tranzmon","last_synced_at":"2026-05-01T09:32:35.821Z","repository":{"id":37415584,"uuid":"373186027","full_name":"hkzlab/tranzmon","owner":"hkzlab","description":"TranzMON is a resident monitor for the Tranz 330 POS terminals, that turns them into a multipurpose Z80-based 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TranzMON\n\nTranzMON is a resident monitor for the Tranz 330 POS terminals.\nIt turns the POS into a multi purpose Z80 based computer that can also be used as an educational tool.\n\nIt's sufficient to burn the binary into a 27C256 EPROM and put it in place of the original one at U6 on the control board.\n\n![TranzMON running](pics/tranzmon.jpg)\n\n## Supported functions\n\n- Serial console at 19200bps 8-n-1\n- External keypad/VFD input\n\n- Port IN/OUT (keypad and console)\n- Memory READ/WRITE (keypad and console)\n- Jump execution to an address (keypad and console)\n- Memory upload/download via XMODEM (console)\n- RTC (console and keypad)\n\n### Console commands\n\n- **O** xx yy          -\u003e Output value yy to port xx\n- **I** xx             -\u003e Input from port xx\n- **J** xxxx           -\u003e Jump execution @xxxx\n- **F** xxxx yy zz     -\u003e Fill zz bytes of RAM with yy starting @xxxx\n- **W** xxxx yy        -\u003e Write zz @xxxx\n- **R** xxxx yy        -\u003e Print yy 16b blocks of RAM starting @xxxx\n- **X** xxxx           -\u003e Download data via XMODEM @xxxx\n- **U** xxxx yyyy      -\u003e Upload yyyy bytes via XMODEM  from xxxx\n- **T** ddMMyyhhmmssD  -\u003e Show or set current date (D is day of week, starts at 0 with Sunday)\n\n## Keypad commands\n\n- **1**: Memory inspection/edit mode\n- **2**: Port input mode\n- **3**: Port output mode\n- **4**: Jump mode\n- **5**: RTC set mode\n\n## Function table\n\nStarting at a fixed address of 0x7F00, the monitor provides an address table of common functions that reside in ROM code, and that can be called from code uploaded in RAM.\n\n**TODO**: Describe the table\n\n\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fhkzlab%2Ftranzmon","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fhkzlab%2Ftranzmon","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fhkzlab%2Ftranzmon/lists"}