On 2016-11-05 10:51 AM, didier derny wrote: > > Thanks for the information; I'll have to check those signals. > > I guess the signal leaving the 6545 is OK; or, I would have a bad display. > > Everything looks like if there was another source of irq above the one > from the crtc. > > The cursor looks mostly good; but some times, a kind of high-speed blinking. > > On 05/11/2016 12:50, Christian Dirks wrote: >> I think /IRQ is generated by the 6520 on UB12 by VERT DRIVE on CB1, >> coming from the CRTC through the 7486 on UC2. >> >> Am 04.11.2016 um 21:46 schrieb didier derny: >>> Now, the cbm8032 is powered with 12v DC, with 2 diodes added on the >>> circuit to drop the 12v to about 10.8v (9.3v on unregulated connector). >>> When I check the 6v on the tape connector, it is at about 6.05v, seems >>> correct. >>> >>> When I try to save a program, everything looks OK. >>> When I try to load a program, seems OK to the "Ready."; but, no cursor -- >>> any idea? >>> >>> I may have a clue: the cursor blinking seems irregular. I guess a >>> problem with the irq. >>> Any idea how the irq is generated on the 8032? 6522? The CRTC makes the "Jiffy" interrupt. The datasette driver disables that one, and uses its own higher-rate timer interrupt. When it finishes, it disables its interrupt, and re-enables the Jiffy one. But, it looks as though the datasette IRQ isn't being disabled on your machine, after a LOAD. Message was sent through the cbm-hackers mailing listReceived on 2016-11-06 01:00:02
Archive generated by hypermail 2.2.0.