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Apple II

Technical Notes

Developer Technical Support

Apple IIGS

#26: ROM Revision Summary

Revised by: Matt Deatherage September 1989

Written by: Rilla Reynolds October 1987

This Technical Note summarizes revisions to the Apple II

ROM.

Changes since November 1988: Revised to cover ROM 3.

Apple currently supports two configurations of the Apple II

ROM, ROM 1 and ROM

3. In August 1989, Apple II

computers began shipping with a 256K ROM, referred to

as version 3 or ROM 3 (ROM 2 was skipped since there was already enough confusion

about the first version, ROM 0, and the second version, ROM 1). System Software

continues to support ROM 1, but it no longer supports ROM 0. Authorized Apple dealers

can upgrade older systems (i.e., machines with serial numbers lower than E704…) to

ROM 1 upon request.

ROM 1 requires System Software 2.0 or later, while ROM 3 requires System Software

5.0 or later. Although applications may work using older system software releases, they

may not function properly due to the coordination of system software and ROM

revisions.

Changes from ROM 0 to ROM 1

ADB

• Absolute ADB devices are now supported correctly.

• ADB fatal system error code is now $0911 instead of $0400.

• ADBReset routine now delays about 160 microseconds before reading the buttons.

• ADBStatus TRUE is now $FFFF instead of $0001.

• All ADB error codes now include the tool number.

• SRQrmv no longer crashes when you make the call with a command pending.

AppleDisk 3.5

• AppleDisk 3.5 Macintosh block reads and writes now work as documented.

• Extended status call now returns bit 0 = 1 if AppleDisk 3.5 media has been switched

since the last READ, WRITE, or FORMAT.

1 2 3 4 5 6 7

Inhaltsverzeichnis

Seite 1 - Technical Notes

Apple II Technical Notes Developer Technical Support Apple IIGS #26: ROM Revision Summary Revised by: Matt Deatherage September 19

Seite 2

Apple II Technical Notes Apple IIGS #26: ROM Revision Summary Page 2 of 7 • New AppleDisk 3.5 status calls have been implemented to get internal v

Seite 3

Apple II Technical Notes Apple IIGS #26: ROM Revision Summary Page 3 of 7 • Firmware entry calls now return processor status in high byte instead

Seite 4

Apple II Technical Notes Apple IIGS #26: ROM Revision Summary Page 4 of 7 • Pixel painting routines support QuickDraw Auxiliary Tool Set stretchin

Seite 5 - Changes from ROM 1 to ROM 3

Apple II Technical Notes Apple IIGS #26: ROM Revision Summary Page 5 of 7 Sound • Fixed bug in FFStopSound call. • Fixed low-level RAM read/write

Seite 6

Apple II Technical Notes Apple IIGS #26: ROM Revision Summary Page 6 of 7 Control Panel CDA • The original Options menu is now the Keyboard menu

Seite 7

Apple II Technical Notes Apple IIGS #26: ROM Revision Summary Page 7 of 7 • Battery RAM value $59 now controls the presence of the Visit Monitor a

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