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- The Modified BIOS as set up in these files expects certain hardware in
- order to use it.
-
- C-128 CPU
- 1 to 3 1541/1571's
- Ram Expander Cartrige
-
-
- You must have the Disks supplied in the Digital Research Offer (the one
- mentioned in the tear out card in the middle of your System Guide).
-
- First try to assemble the BIOS without making any changes, there should
- be no problems. If that is the case then you can try additional changes
- in order to configure it to your needs.
-
- The C-128 BIOS is supplied in several modular files, I have commented
- most of the changes I have made throughout the code. At the top of each
- module I have changed, I have also commented on the changes in the file.
-
- Read the comments, study the code, and read the DRI manual (the back two
- sections). This will give you the best understanding of how things fit
- together.
-
- When making changes, try to avoid changing more than 1 module at a time,
- if you make too many changes at once, debugging will be more difficult.
-
- The current system is defined as thus:
-
- 3 1541/1571's, as drives A:, B:, C:
- Ram Expander as drive D:
- 2 printers, one as unit 4, one as unit 5.
- unit 4 is PRT-LQ
- unit 5 is PRT-MX
- Unit 5 is the default selection. To change this change the
- definition of the label at the top of the file CXIO.ASM from
- 08h to 10h.
- Modem or printer attached to the user port
- 6551 serial card attached to the expansion port (the 6551 card has not
- been tested for compatibility with the Ram Expander)
- Key repeat rate and the 'feel' are set in the CXIO.ASM module
- 40 column display is not supported.
- the label 'NULL40' in CXIO.ASM has been left in order to maintain
- compatibility with the modem programs, since several of them depend upon
- the RS-232 device parameter block to be at its present position in
- DEVTBL:, removing 'NULL40' would change this.
- Virtual disk is not supported.
- Though I am considering adding it back as drive P:
- The Screen Dump is activated by pressing the ALT key
-
- Call me if you have any questions.
- dering adding it back as drive P:
- The Screen Dump is activated by pressing t