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    Interrupts on 68000 based macs

    Hi, I'm working on a program in assembly that requires interrupts/exceptions at a frequency that can be modified. From my understanding, interrupts are generated by peripheral devices. Besides the video blanking interrupt which occurs 60 times per second, are there any other time dependent...
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    Problem with InitGraf in MPW 3.2.3 (assembly)

    Today I came across this technical note "InitGraf with MPW assembly": https://www.fenestrated.net/mirrors/Apple Technotes (As of 2002)/pt/pt_16.html Would you believe there is an example mentioned but not present in the technical note, the line that allocates the QD record? Is there an...
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    Problem with InitGraf in MPW 3.2.3 (assembly)

    That explains everything. Thanks. I had looked through Sample.a and tried the same includes and referenced the QD record instead of the A5-4 memory location, but I was missing the QD DS QDGlobals allocation line. 
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    Problem with InitGraf in MPW 3.2.3 (assembly)

    Hi, For the life of me I can’t figure out why this code is crashing. It’s literally the first Init call for the toolbox: PEA -4(A5)     ; push address of thePort onto the stack for call to InitGraf _InitGraf I’m using Mini vMac. I’ve tried: different host computers (OS X, Windows 10)...
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