On 5/24/17 9:52 AM, Jim Brain wrote: > Write your own parallel routines using the IEEE lines as conduits for your non > IEEE protocol. I suggest that any new protocol using the IEEE-488 lines should be designed to be compatible with the 75160/75161 transceivers. This will allow it to be used on the CBM-II computers and also the modern PetSD-based devices. On the PET/CBM computers, the IEEE-488 lines use MC3446 transceivers. The lines can be controlled independently and used in nonstandard ways. I believe this is true of the drives also, but I haven't checked all of them. The CBM-II computers use the 75160/75161. They are more restrictive. The SSE SoftBox is a peripheral designed for PET/CBM only. It uses the IEEE-488 data lines in an interesting way. It has a mode where six of the eight data lines are used as outputs while the remaining two are used as inputs. When I ported the code to CBM-II, I found that the CBM-II hardware wasn't capable of doing this because of the different transceivers. Mike -- Mike Naberezny (mike@naberezny.com) http://6502.org Message was sent through the cbm-hackers mailing listReceived on 2017-05-24 20:00:02
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