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Published 20 hours ago • verified publisher icon mamedev

apple/apple2e.cpp: reset IOU softswitches

Open xotmatrix opened this issue 5 months ago • 3 comments

Some IOU softswitches are not being reset when the system is reset. This can leave the display and annunciators in an incorrect state after a reset.

From a fresh start, enter the following into the monitor to enable 80-column video and then press RESET. Note the 80-column video remains enabled which is not correct.

*C00D:1

From a fresh start, enter the following into the monitor to draw MouseText characters to the screen and then press RESET. Note the MouseText characters remain enabled which is not correct.

*C00F:1 N 428:40 41 42 43 44 45

This patch corrects these issues by adding reset handling for the missing IOU softswitches:

  • 80COL
  • ALTCHR
  • AN0
  • AN1
  • AN2
  • AN3

In addition, reset code related to MMU, IOU, and LC softswitches has been reorganized into logical groups.

xotmatrix avatar Feb 03 '24 02:02 xotmatrix