This is a programmer for EEPROM memory chips in DIP28 package. The programmer connects to a PC over a virtual COM port using an FT232 at 230.4k baud. The firmware of the programmer supports the following commands over serial:
R: Read a byte from ROM
W: Write a byte to ROM
L: XMODEM a file from ROM
S: XMODEM a file to ROM
C: XMODEM a file to ROM and confirm
D: Display data in ROM
P: Page write settings