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rom4x
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rom4x/rom5x
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mgcaret cda85678ee Add script to zip built images 2017-01-29 15:54:00 -08:00
..
B0_FCDE_patch_coldstart.s basic functionality for IIc+ 2017-01-29 15:38:12 -08:00
B1_CF00_rom5x.s basic functionality for IIc+ 2017-01-29 15:38:12 -08:00
B1_FCE1_go_to_rom5x.s basic functionality for IIc+ 2017-01-29 15:38:12 -08:00
README.md Add script to zip built images 2017-01-29 15:54:00 -08:00
Rakefile basic functionality for IIc+ 2017-01-29 15:38:12 -08:00
iic+.defs basic functionality for IIc+ 2017-01-29 15:38:12 -08:00

README.md

ROM 5X by MG

DO NOT EVEN TRY THIS YET :-)

Warning: This has not been tested on an emulator or a real Apple IIc Plus.

This is a patch for the Apple IIc Plus firmware that tries to recover a battery-backed RAM disk upon cold start. Because of the limited space in the Apple IIc ROM. it does not have the complete feature set of ROM 4X for the (non-Plus) //c.

Upon cold start, the patch checks for a potentially bootable RAM disk and restores the appropriate screen holes to prevent it from being destroyed and to enable boot. If a RAMdisk is recovered, a flashing "R" will appear in the lower left corner of the screen.

To prevent the check and recovery, power on the machine with the Option key held down. A flashing "O" will appear in the lower left corner of the screen and the system will boot without checking for or recovering any RAM disk.