* [parisc-linux] Parallel port hardware (fwd)
@ 1999-11-29 17:08 Bill Katz (William)
1999-11-29 17:55 ` Philipp Rumpf
1999-11-29 23:16 ` Sandy Harris
0 siblings, 2 replies; 3+ messages in thread
From: Bill Katz (William) @ 1999-11-29 17:08 UTC (permalink / raw)
To: parisc-linux
----- Forwarded message from Sandy Harris -----
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* Re: [parisc-linux] Parallel port hardware (fwd)
1999-11-29 17:08 [parisc-linux] Parallel port hardware (fwd) Bill Katz (William)
@ 1999-11-29 17:55 ` Philipp Rumpf
1999-11-29 23:16 ` Sandy Harris
1 sibling, 0 replies; 3+ messages in thread
From: Philipp Rumpf @ 1999-11-29 17:55 UTC (permalink / raw)
To: bkatz; +Cc: parisc-linux
> Early 715s (/33, /50, /75) use a WDC 16C522 (or is it 552?) for the 2
The one in my 715/33 is labelled 16C552-JT.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [parisc-linux] Parallel port hardware (fwd)
1999-11-29 17:08 [parisc-linux] Parallel port hardware (fwd) Bill Katz (William)
1999-11-29 17:55 ` Philipp Rumpf
@ 1999-11-29 23:16 ` Sandy Harris
1 sibling, 0 replies; 3+ messages in thread
From: Sandy Harris @ 1999-11-29 23:16 UTC (permalink / raw)
To: parisc-linux
"Bill Katz (William)" wrote:
> Sandy Harris wrote:
> |Can anyone point me to info on the electrical properties of the parallel ports
> |on 712 or 715 machines?
> |
> |I'm thinking that 8 715s might make an interesting parallel engine, but the cable device
> |only works if the parallel port's control lines are implemented as open collector TTL.
> |Where can I discover whether they are?
>
> Early 715s ...
>
> Later 715s (/64, /80, /100) and all 712s use Lasi. From the chip ERS
> (not published, it's mostly electrical stuff) Data strobe, autofeed,
> parinit, and select
>
> The ones that connect to pins 1, 14, 16, and 17 are open collector.
Bingo! Those are exactly the four lines used for the Wapers parallel stuff.
http://garage.ecn.purdue.edu/~papers/WAPERS/
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1999-11-29 17:08 [parisc-linux] Parallel port hardware (fwd) Bill Katz (William)
1999-11-29 17:55 ` Philipp Rumpf
1999-11-29 23:16 ` Sandy Harris
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