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Twiggy mini vmac2/27/2023 ![]() The second change has to do with resource names. The first has already been mentioned: the length byte was changed from 2 to 4 bytes. ![]() It has two big changes from what was used in the production system. I have fully documented the Twiggy resource fork format. Twiggy Resource Forks and Desk Accessories Extracted ![]() So if someone writes a little utility to change the Twiggy resources by adding two zeros to the length bytes, and updates the proceeding offsets accordingly, we may be able to get these programs and desk accessories to work in a standard 128K system, or at the very least, will be able to use ResEdit to examine the resources! This is confirmed in the comments of the Pascal source code for the Macintosh resource manager which was published in the Hertzfeld Mac Folklore Anecdotes PDF that is at Vault (not online, though) and elsewhere online. The length byte of resources was 2 bytes up till September 1983, then it changed to 4 bytes as it remained throughout the rest of history. I was wondering how MacsBug worked.Īlso, the resource fork change has been CONFIRMED. If interrupt switch is pressed, Mac sends contents of the CPU registers via serial (printer) port. I can also confirm that the MacsBug present on MacAuthor disk is working on real mac. If you try to copy MacPaint to another disk you get disk read error. But I think it's because the MacPaint application is corrupted. Quote: Yeah, MacPaint is crashing on the Mac 128K too. ![]()
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