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reenigne
MAME Fan
Reged: 04/08/15
Posts: 5
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Re: 8088 mph we break all your emulators
04/09/15 12:06 PM


> Depends on the bus interface. For the 68000 it's dead easy to withhold /DTACK for an
> arbitrary number of cycles while the hardware being accessed does stuff

Sounds like the equivalent on the PC to the "+IO CH RDY" line on the ISA bus. A peripherial can pull this low to suspend one of the phases of a bus access cycle, introducing wait states. That's not quite the same as interrupting the CPU on an arbitrary cycle, though - the execution unit can keep on running during these wait states, and the bus interface unit can only be suspended in one of its phases.







Entire thread
Subject Posted by Posted on
* 8088 mph we break all your emulators RdW 04/08/15 04:56 AM
. * Re: 8088 mph we break all your emulators Moose  04/08/15 08:26 PM
. * Re: 8088 mph we break all your emulators jonwil  04/08/15 05:44 AM
. * Re: 8088 mph we break all your emulators MooglyGuy  04/08/15 08:02 AM
. * Re: 8088 mph we break all your emulators reenigne  04/08/15 11:05 AM
. * Re: 8088 mph we break all your emulators MooglyGuy  04/09/15 11:32 AM
. * Re: 8088 mph we break all your emulators reenigne  04/09/15 11:59 AM
. * Re: 8088 mph we break all your emulators R. Belmont  04/08/15 05:07 PM
. * Re: 8088 mph we break all your emulators reenigne  04/08/15 07:04 PM
. * Re: 8088 mph we break all your emulators MooglyGuy  04/09/15 02:38 AM
. * Re: 8088 mph we break all your emulators Vas Crabb  04/09/15 06:32 AM
. * Re: 8088 mph we break all your emulators reenigne  04/09/15 05:47 AM
. * Re: 8088 mph we break all your emulators R. Belmont  04/09/15 11:49 AM
. * Re: 8088 mph we break all your emulators reenigne  04/09/15 12:06 PM
. * Re: 8088 mph we break all your emulators Olivier Galibert  04/10/15 03:22 AM

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