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.
-
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)
- 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)
- 1: Memory inspection/edit mode
- 2: Port input mode
- 3: Port output mode
- 4: Jump mode
- 5: RTC set mode
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