Hallo Marko, First thanks for placing the RTC GIF. Looking the result I noticed that my old email and URL are mentioned with the "External Kernal Card". Could you correct that please (or remove it)? > > IOCHCK is an active (L) signal meant to signal the PC that there is a memory > > parity error. On the end this signal triggers the NMI-input of the CPU. As > > so we can use the NMI-input of the expansionport. > > Or ignore the signal. NO. We develloped HW for an hospital which used this line. SW made sure that the PC did not see this NMI as a parity error. I don't see why other devellopers could not have done the same. > "input can be found"? Probably you meant "can't". Absolutely correct. > But there is such an input: the DMA signal (active low) will stop the CPU. Yes. But also tristates the address- and databus. And that is something that does not happen with the PC-bus. And I'm very sure not even wanted. > You could also use free VIC and SID addresses. The last VIC-IIe > register is at $d030, isn't it? You could decode and use > $d031-$d03f for your own purposes. Do you mean to say that I can use these addresses without any fear of buscollision? I read some discussions about this subject about a year (?) ago, but didn't realise this. Groetjes, Ruud http://home.hccnet.nl/g.baltissen/index.htm - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
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