[Coco] Of Multi Pak Interfaces...

[RETRO Innovations]

   HCT logic should have 15 lsttl loads, so I think you'll be OK.

   Jim

     On March 25, 2015 at 8:15 AM camillus blockx
     <camillus.b.58 at gmail.com> wrote:
     Hi arthur,
     I was under the impression that only the nibble ( 4 bit ) of the lsb
     was the slot selection, and the other nibble did the CSC and the
     Cart lines.  So no problem to select to 8 slots. I was told to take
     a good look at the buffer chips when 8 slots used. I guess the load
     would get close to the max. So I wonder if double buffering would
     be usable, and not be messing with timing. The propagation time
     would be doubled.
     Correct me if wrong...
     camillus
     On 3/25/2015 5:21:36 AM, Arthur Flexser <flexser at fiu.edu> wrote:
     Oops, just remembered that all 8 bits of $FF7F are used for slot
     selection,
     with values of $00, $11, $22, and $33. So I'd guess a 6-slot
     multipack
     would use $44 and $55 to select the additional slots?
     Art
     On Wed, Mar 25, 2015 at 6:16 AM, Arthur Flexser wrote:
     > Out of curiosity, what would happen if you plugged one multipack
     into
     > another, or more gracefully accomplished the equivalent through a
     > connecting ribbon cable? Could one get 7 slots that way, perhaps
     via some
     > minor modifications to the circuitry?
     >
     > Relatedly, how do 3rd party MPIs with more than 4 slots do slot
     selection?
     > Is bit 2, in addition to bits 0-1 of $FF7F, used?
     >
     > Art
     >
     > On Wed, Mar 25, 2015 at 6:05 AM, Rogelio Perea wrote:
     >
     >> With the recent trend on the MPIs becoming a hot item on Ebay
     (for one
     >> on-line selling venue), I wonder how those who have an MPI on
     active duty
     >> are using it for. Radio Shack pushed the MPI first as a
     convenient way to
     >> switch between Paks. With the accessories that came later the MPI
     4 slots
     >> could be taken as not enough ;-)
     >>
     >> I have two on MPIs duty, one with an F board (a 3024 MPI) and one
     with a
     >> CoCo (upgraded 3124). The setup on both is almost the same:
     >>
     >> Slot 4 - Disk Controller , a 3029 for the CoCo 1 and a FD-502 for
     the 3
     >> Slot 3 - Speech and Sound pak on the CoCo 1, Rulaford Research
     MIDI on
     >> the 3
     >> Slot 2 - Orchestra 90 on both for the most time, sort of the wild
     card
     >> slot
     >> for both CoCo setups
     >> Slot 1 - CoCo SDC, has become the mainstay on both MPIs
     >>
     >> Beyond this I don't do much Pak swapping, maybe an occasional
     RS232 here
     >> or
     >> there, a game once in a while (many on SDC images nowadays). Can
     say the
     >> list above is the official setup.
     >>
     >>
     >> -- RP
     >>
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     >
     >
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