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Additions to the Powerbook 100 ROM

The Powerbook 100 ROM is identical to the ROM used in the Macintosh Portable M5120 and M5126, with the addition of code for booting in SCSI Target Disk Mode.

Differences on the M5126 Macintosh Portable

Backlit display, with additional ICs on the logic board to support this
Simplified power circuitry (no hybrid)
Removed the external power manager connector and switch
Removed ROM wait state select switch
Replaced the 32 SRAM chips with 8 PSRAM chips
Additional logic to generate a faster DTACK signal for the RAM as well as a refresh signal
Minor changes to sound circuitry

Other Early Portable Mac Clones

M' TOP
Outbound Laptop