https://microcorelabs.wordpress.com/2023/05/05/convert-an-apple-ii-into-an-apple-1-using-mcl65/
Small project which runs the Apple I Woz Monitor PROMs inside of an Apple II.
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Very interesting project, thanks for sharing. On a quick glance I may have missed it but is the cassette interface supported?Also, if you have used a "brain board" for the Wozaniam pack / Apple 1 mode in an Apple II, I'm curious your opinion on any advantages in your project/methodology over that one.
Yes, the cassette input and output could be plumbed in as a possible next step. The MCL65+ 6502 emulator is cycle accurate, however I might need to trim the cassette data timing. I have been cut-pasting files via a terminal and pre-loading into RAM which has been very fast and error free.
The Brain Board is a different approach which uses a modified BIOS to translates the video and keyboard I/O and adjusts cassette timing. I am using the unmodified 256-byte Woz monitor which one could argue is a more "pure" Apple 1 representation. I can additionally accept keyboard input over USB serial plus preload any address in memory so the approaches are very different.
Mine was also developed 15 years later and is lucky to have the use of a modern, ultra-fast microcontroller with everything written in C over the course of a day! I have deep respect for the Brain Board's design approach and the time and effort it must have taken to develop.