https://github.com/raybellis/mos120

Acorn BBC MOS 1.20
https://github.com/raybellis/mos120

Last synced: 21 days ago
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Acorn BBC MOS 1.20

• Host: GitHub
• URL: https://github.com/raybellis/mos120
• Owner: raybellis
• Created: 2018-10-02T17:35:39.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2023-09-24T12:20:15.000Z (over 1 year ago)
• Last Synced: 2024-12-06T21:42:23.118Z (about 1 month ago)
• Language: Assembly
• Size: 566 KB
• Stars: 13
• Watchers: 4
• Forks: 6
• Open Issues: 2
• Metadata Files:
  • Readme: README.md

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README

        
# mos120

This repo contains fixed copies of the annotated BBC MOS 1.20

disassembly from http://mdfs.net/Docs/Comp/BBC/OS1-20/ as well

as scripts and additional files that permit automated conversion

into ca65 syntax.

Building requires _two_ invocations of `./bin/convert.sh` and

then one of `./bin/compile.sh`.

The two passes of `convert.sh` are necessary to be able to convert

both forward and backwards code references into labels - the first

pass finds the addresses that are targets of references, and the

second writes those labels into the source.

Fixes to the original disassembly files include:

- convert all files to NL terminated

- split FC00 file at FF00 so I can use the real ROM contents in place of JIM/FRED/SHEILA

- ensured all hex constants are prefixed accordingly

- replaced a few addresses with computed offsets from labelled addresses

- removed some duplicate chunks of code left over from the file split

- inserted a couple of missing instructions

- fixed character case errors in some string constants

- resolved various other minor typos