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Text File | 1990-04-29 | 2.5 KB | 55 lines | [04] ASCII Text (0x0000) |
- Apple II
- File Type Notes
- _____________________________________________________________________________
- Developer Technical Support
-
- File Type: $5A (90)
- Auxiliary Type: $0002
-
- Full Name: Battery RAM saved configuration
- Short Name: Battery RAM configuration
-
- Written by: Matt Deatherage May 1990
-
- Files of this type and auxiliary type contain images of Apple IIgs Battery
- RAM.
- _____________________________________________________________________________
-
- Since the IIgs battery-powered RAM contains important system parameters and
- control information, many utility programs would like to save an image of all
- these parameters for later restoration. This ability can be handy when
- changing batteries or in a classroom situation where students may change text
- colors and preferences to suit their individual tastes--without regard for the
- teacher who has to restore the machine to normal operation for the next class.
-
- Apple has defined the following simple file format for use in such instances.
-
-
- The File Format
-
- The file format contains a safety catch to prevent parameters defined for new
- machines from interfering with older machines.
-
- ROMVersion (+000) Word The version number of the
- Apple IIgs ROM for the machine on
- which this file was created. The
- file should only be restored on
- machines of the same ROM version.
- For example, if this value is $0003,
- the image of Battery RAM should not
- be written to a ROM 01 machine.
- Instead, warn the user of the
- incompatibility.
- BRAM (+002) 256 Bytes 256 bytes of battery RAM
- image. This is obtained from the
- ReadBRam tool call and should be
- restored (where appropriate) with
- the WriteBRam tool call.
-
-
- Further Reference
- _____________________________________________________________________________
- o Apple IIgs Firmware Reference
- o Apple IIgs Toolbox Reference, Volume 1
-
-