9 Aug
2000
9 Aug
'00
1:27 p.m.
Allison's right, an M8027, LPV11 (Q-bus version of
the LP11). I'm not
interested in driving a printer with it, I want to talk to a Zip Drive.
As
long as I can create a "Centronics"
compatible interface (even with all
8
data bits being output only) I have a chance of getting
it to talk to
the
zip drive. That would give me 100 MB of removable
storage, on a PDP-11
that
would be like heaven.
--Chuck
Read up on parallel ports for PC first, the M8027 WILL NOT be sufficient.
Most
parallel ports ahve enough bidirectional lines and the 8bit data is
bidirectional
(only the old XT ports aren't).
Look into a m7941 (DRV11) parallel line unit sa that give you lots of
bits for
parallel IO. Another would be the M7950 DRV-11B general purpose DMA
interface (also a parallel IO). The latest one was the DRV-11J (M8049)
and that has enough lines to interface anything (32 in and 32 out).
The later boards could possibly even be enough to fake the IDE interface
directly. Even an old clunky 120mb WD2120 would seem large!
Allison
9 Aug
9 Aug
4:33 p.m.
At 09:27 PM 8/9/00 -0400, Allison wrote:
Read up on parallel ports for PC first, the M8027 WILL
NOT be sufficient.
Most parallel ports ahve enough bidirectional lines and the 8bit data is
bidirectional (only the old XT ports aren't).
I have, and they are, _if_ they are CENTRONICs compatible. There are 11
output bits and 6 input bits. When you have such a port on your PC (and
even PC/AT and some 386 machines had them) you could use them in "nybble"
mode. In this mode four of the 8 data bits are outputs, Busy/SLCT/Paper
Out/Fault are inputs, strobe is "write nybble", ACK is "read nybble",
and
the upper four bits are used to control things like interface direction and
turn around. In this way a general 4 bit bi-directional interface is
created that can run and 400KBits/sec on some machines! (typically closer
to 300Kbits but still)
Ports that aren't Centronics compatible _really_ don't always work. However
I could also try it with a M7941.
--Chuck
10 Aug
10 Aug
2:40 a.m.
ajp166 wrote:
Look into a m7941 (DRV11) parallel line unit sa that
give you lots of bits for
parallel IO. Another would be the M7950 DRV-11B general purpose DMA
interface (also a parallel IO). The latest one was the DRV-11J (M8049)
and that has enough lines to interface anything (32 in and 32 out).
The later boards could possibly even be enough to fake the IDE interface
directly. Even an old clunky 120mb WD2120 would seem large!
Jerome Fine replies:
Any ideas as to how the DRV11-J (M8049) might need to be programmed
to interface to an IDE drive? Any could that become a device driver?
I have heard that there is a possibility of using an IDE as the disk drive
behind a controller that would be able to use the HD(X).SYS device
driver that John Wilson makes use of in the E11 emulation software.
In addition, it has been suggested that even a SCSI drive might be OK
as well. What might be involved in producing such an animal? While
HD(X).SYS is far too simple a concept to use in an OS that requires
multi-tasking, like RSX, for RT-11 it seems like the perfect solution.
Unfortunately, I have so little hardware knowledge that I do not know
even what questions should be asked.
Sincerely yours,
Jerome Fine
6:11 a.m.
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ajp166＠bellatlantic.net -
ard＠p850ug1.demon.co.uk -
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