On 25 February 2018 00:28:53 CET, Mia >There is the "killer poke" that turns the VSYNC detect input to an >output. On the oldest PETs the hardware did drive hard enough that this >didn't matter but it disabled the timing logic halting the cpu when >accessing video ram while video were displayed. On newer machines it >messes up VSYNC output. There was a loop in ROM that tested the bit and delayed until retrace. It was taken out later. -- Sent from my Android device with K-9 . Please excuse my brevity. Message was sent through the cbm-hackers mailing listReceived on 2018-02-26 00:02:27
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