https://github.com/hkzlab/tranzmon

TranzMON is a resident monitor for the Tranz 330 POS terminals, that turns them into a multipurpose Z80-based computer.
https://github.com/hkzlab/tranzmon

embedded homebrew reverse-engineering z80

Last synced: about 3 hours ago
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TranzMON is a resident monitor for the Tranz 330 POS terminals, that turns them into a multipurpose Z80-based computer.

• Host: GitHub
• URL: https://github.com/hkzlab/tranzmon
• Owner: hkzlab
• Created: 2021-06-02T13:53:55.000Z (over 3 years ago)
• Default Branch: master
• Last Pushed: 2021-06-02T14:03:48.000Z (over 3 years ago)
• Last Synced: 2023-03-11T21:47:39.496Z (almost 2 years ago)
• Topics: embedded, homebrew, reverse-engineering, z80
• Language: C
• Homepage:
• Size: 216 KB
• Stars: 4
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: Changelog.md

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README

        
# TranzMON

TranzMON is a resident monitor for the Tranz 330 POS terminals.

It turns the POS into a multi purpose Z80 based computer that can also be used as an educational tool.

It'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.

![TranzMON running](pics/tranzmon.jpg)

## Supported functions

- Serial console at 19200bps 8-n-1

- External keypad/VFD input

- Port IN/OUT (keypad and console)

- Memory READ/WRITE (keypad and console)

- Jump execution to an address (keypad and console)

- Memory upload/download via XMODEM (console)

- RTC (console and keypad)

### Console commands

- **O** xx yy          -> Output value yy to port xx

- **I** xx             -> Input from port xx

- **J** xxxx           -> Jump execution @xxxx

- **F** xxxx yy zz     -> Fill zz bytes of RAM with yy starting @xxxx

- **W** xxxx yy        -> Write zz @xxxx

- **R** xxxx yy        -> Print yy 16b blocks of RAM starting @xxxx

- **X** xxxx           -> Download data via XMODEM @xxxx

- **U** xxxx yyyy      -> Upload yyyy bytes via XMODEM  from xxxx

- **T** ddMMyyhhmmssD  -> Show or set current date (D is day of week, starts at 0 with Sunday)

## Keypad commands

- **1**: Memory inspection/edit mode

- **2**: Port input mode

- **3**: Port output mode

- **4**: Jump mode

- **5**: RTC set mode

## Function table

Starting 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.

**TODO**: Describe the table