Wonder if we could embed a proc and flash in a serial din connector and have a 1541 for the size of a DIN -----Original Message----- From: email@example.com [mailto:firstname.lastname@example.org] On Behalf Of Steve Gray Sent: Thursday, April 28, 2011 3:22 PM To: email@example.com Subject: Re: PC as 1541 ----- Original Message ---- > From: Spiro Trikaliotis <firstname.lastname@example.org> > To: email@example.com > Sent: Thu, April 28, 2011 3:02:11 PM > Subject: Re: PC as 1541 > > I am wondering if it's possible to use ATN line then to generate an > > IRQ on the PC side (so you don't need polling). > > Neglecting that the "market" for a parallel port based solution will > get smaller and smaller: > > In principle, this would be possible, yes. Unfortunately, the number > of parallel port input lines is limited on the PC. Even worse, the > number of input lines that can generate an IRQ is much more limited: > You only have one line. > > For the listener hold off, we already need the DATA line generate an > interrupt. We could add the ATN line, so both DATA and ATN generate an > IRQ. However, then we would need another input line (to distinguish > ATN and DATA), which we do not have. In fact, the current X*1541 > cables all do not have an ATN input line at all! Could you not connect both ATN and DATA to the regular IO lines, but also to the input of an OR GATE, which is then fed to the interrupt line? The IRQ triggers and you check the regular IO lines to determine which line fired, Steve Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2011-04-28 20:00:30
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