PCjs Machines

Texas Instruments TI-55 ROM

Our TI-55 ROM comes from Sean Riddle, who decapped a TMC1503, photographed the ROM, and produced the following resources:

• Die Shots
• ROM Array Photo
• Raw ROM
• Original ROM (Big-endian)

From the Original ROM (Big-endian), I created an Original ROM (Little-endian) binary:

node ../../ti57/rom/be2le.js tmc1503be.bin tmc1503le.bin

along with the corresponding JSON Data that the PCjs TI-55 Emulator uses:

node ../../ti57/rom/bin2json.js tmc1503le.bin > tmc1503le.json

See the TI-57 ROM for more details on the ROM format, including how the “raw” photographic ROM data is used to produce a working ROM binary.

[GitHub Source]