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8-bit acorn hardware • Weird problem on a couple of Beebs

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I have a flashing cursor in the top left of the screen on three Beebs (all issue 7), connecting up the Tube Snooper I can see the processor trapped in an endless loop, only interrupts give it a chance to do something else, then back at it, spinning over and over.

It took me a while to find the bit o'code from the disassembly of OS1.2 here https://tobylobster.github.io/mos/mos/S-s11.html unfortunately, despite all the lovely work, I would have preferred the hex address and hex of the instructions to be like a traditional disassembly (maybe I'll fork it into that when I get some spare time)
The lack of BRK handler is the cause of the endless loop
This bit o'code shows the principle (CALL CODE)
I assume somewhere BASIC or something is supposed to take ownership and clear the carry flag?

Has anyone seen this before?

Statistics: Posted by maniacminer — Mon Apr 29, 2024 11:49 pm



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