From: Richard Erlacher <edick(a)idcomm.com>
>I'd be VERY interested in seeing that schematic, Tony! I've no doubt
that it
>can be done, but I wonder how fast it will be.
The commercial ones are at least several mb/sec using drives designed for
DMA33. Only took a minute or less to transfer a set of 28 .CAB files
(w95).
The device driver runs as a SCSI device under W9x or NT4.
Allison
>----- Original Message -----
>From: "Tony Duell" <ard(a)p850ug1.demon.co.uk>
>To: <classiccmp(a)classiccmp.org>
>Sent: Wednesday, March 28, 2001 11:01 AM
>Subject: Re: ide harddrive
>
>
>> >
>> > Evening folks, I am looking for a circuit using the parallel port on
a
>> > pc to Ide interface, does anyone have a schematic for one?
>>
>> Somewhere I have an data sheet for a chip to convert a parallel port
into
>> an ISA slot. No, I don't mean a chip for adding a printer port to the
ISA
>> bus (like the 82C11 does), I mean a chip that connects to a parallel
port
>> (either 'original' or one of the enhanced bidirectional ports), and to
>> some DRAM, and which allows you to connect anything that you'd
normally
>> connect to ISA on the other side of it. It allows you to read/write
any
>> port or memory location from the parallel port side, it allows the ISA
>> device to do DMA into the memory hung off the chip (which can then be
>> read/written from the parellel port), and so on.
>>
>> I think it was made by SMC, but don't quote me on that.
>>
>> It looked like a fun device to work with, but I don't know where on
earth
>> you'd find one.
>>
>> If anyone is interested, I will try and find the data sheet and post
the
>> number of the device.
>>
>> -tony
>>
>>
>
From: Richard Erlacher <edick(a)idcomm.com>
>I've seen, and, in fact, own, several parallel port to SCSI interfaces,
but
>never a parallel port to IDE type. It's quite conceivable, though. The
>software would be a pain, however.
I have one for Parallel to 3.5" IDE and another for parallel to 2.5" ide.
They work quite well and are much faster than zip or jazz drives.
Also with ECP or EPP the transfers are 8bit bidirectional. The logic
to do that is fairly simple as you simply stack up bytes or half bytes
until you have a 16bit word to write and to read you reverse that to
move successive chunks.
Allison
>From: "Russ Blakeman" <rhblake(a)bigfoot.com>
>To: <classiccmp(a)classiccmp.org>
>Sent: Wednesday, March 28, 2001 5:32 AM
>Subject: RE: ide harddrive
>
>
>> I thought I've seen external cases for IDE HDD's off parallel ports
before,
>> I'll have to run back through my feeble memory banks and figure out
where I
>> saw one.
>>
>> > -----Original Message-----
>> > From: owner-classiccmp(a)classiccmp.org
>> > [mailto:owner-classiccmp@classiccmp.org]On Behalf Of Clint Wolff
(VAX
>> > collector)
>> > Sent: Tuesday, March 27, 2001 11:33 PM
>> > To: classiccmp(a)classiccmp.org
>> > Subject: Re: ide harddrive
>> >
>> >
>> >
>> > it'd be a fairly complicated schematic... The IDE interface is 16
bit
>> > wide data, and a standard parallel port only has four bits of input.
>> > An enhanced parallel port (EPP) can turn the data bits around, but
>> > then you don't have any lines for RD*/WR*/A0-A2/CS1Fx*CS3Fx*, etc...
>> >
>> > I certainly wouldn't want to do it, though I'm sure it can be
done...
>> >
>> > clint
>> >
>> > On Tue, 27 Mar 2001, bill claussen wrote:
>> >
>> > > Evening folks, I am looking for a circuit using the parallel port
on a
>> > > pc to Ide interface, does anyone have a schematic for one?
>> > >
>> > > I also have 20 (2.5 in) toshiba 4.8 gig drives (new and in sealed
>> > > antistatic). these are 2 mm interface ata4 44pin that I will
offer to
>> > > sell to the group before listing them at ebay. ($75 ea + shipping)
>> > >
>> > > I also have AMD K6-2 233 AFR Socket 7 processors (new) these also
will
>> > > be offered to the group for ($20 ea), before I place them on ebay
as
>> > > well.
>> > >
>> > > I am going to put them up in two weeks, so if any one is
interested
>> > > please email me at
>> > > elecdata(a)kcinter.net
>> > >
>> > > Thanks
>> > >
>> > > Bill Claussen
>> > > Elecdata1 (ebay)
>> > >
>> > >
>> > >
>> > >
>> > >
>> >
>> >
>> >
>>
>>
>
ard(a)p850ug1.demon.co.uk (Tony Duell) wrote:
> I've found enough of the data sheet (long story) to be able to say that
> the device in question (printer port -> ISA slot, in that direction) is
> the SMC34C60 (it was made by SMC, I remembered it correctly).
>
> I don't know if you can still get a data sheet (it was about 6 years ago
> I was looking at this), but it might be worth trying to hunt it down
Don't know how much this will help you, Tony, but keying "34C60" into
www.google.com brings up a link to a PDF datasheet as the first item:
http://www.smsc.com/main/datasheets/34c60.pdf
-Frank McConnell
From: Mike Ford <mikeford(a)socal.rr.com>
>>I'm old, dirts older. When I was in school you were really cool of
your
>>radio
>>had six transistors, cooler if it had FM and rich if your portable tape
>
>Are you sure you weren't trying to impress people with the catwhisker on
>your crystal set? ;)
I still have a few feet of very thin phosphorBronze wire from that! Nice
springy material.
The first one used a commercial diode but otherwise traditional. Later
on
I tried a long list of other rectifing materials:
Galena,
Carborundum
Super-Blue blade and pencil
CupricOxide
selenium (from a rectifier)
Silver oxides and sulphides
Rusty nails
I'd read about these in various books as a kid.
Allison
From: Bryan Pope <bpope(a)wordstock.com>
>Shack), but a razor blade and pencil lead... How do you put it
together?
Substitue the blade and pencil lead for the diode in a standard ckt.
The key is the blade be used some (corrosion) and you probe it for the
spot that renders a crude rectifieng junction.
Allison
From: R. D. Davis <rdd(a)smart.net>
>My crystal radio used a germanium diode as well - it was one of those
>Radio Shack kits back in the 1970's.... still have it somewhere.
I have no pretense of my age. By the 1970s I was working as a radio
tech (land mobile and marine) with a commercial license.
>time I checked, there were a few places still selling real "cats
>whiskers" (no - you don't catch the neighbor's cat to get one of these
Cats whisker is a thin peice of springy phospor bronze wire. Try a
peice of had drawn #30 copper with the end filed or cut to a point.
Allison
From: Russ Blakeman <rhblake(a)bigfoot.com>
>I don't think Allison's quite that old but neither am I. I can remember
>JFK's funeral on TV (BW Motorola) and they made one of the best Chevy's
when
>I was born (57) and I don't think Allison is much off from that. At
least
>she won't tell us I'm sure.
Thankyou but... I watched JFK too, Sylvania 21". Heard it on AM
broadcast
regen I'd brought to school. I was pre-'57 Chevy though my parents had
a 57 nomad wagon.
Allison
From: Russ Blakeman <rhblake(a)bigfoot.com>
>Six transistors? Hell most people on the list here had to go home after
>school to listen to info on the radio about the bombing of Japan.
That was by time I was in middle school. before that it was a Philco
AA5 (Tube set).
Allison
From: Pete Turnbull <pete(a)dunnington.u-net.com>
>Don't be silly. My crystal set had a germanium diode, and I bet
Allison's
>did too :-)
V1 did. I was an avid experimenter. By 1963 I was using transistors in
a regen.
Allison
Is this a similar keyboard then the one from a TRS80 model 2000? Looks a lot
like the same on the photos I have seen...and since the machine are from a
similar "era"...
If thats the case, I hooked up a more recent Tandy TX (83 Keys?) keyboard to
an old TRS80 model 2000 and all works fine...the pinout on the connector is
just not the same (I made an DIN adapter plug so I did not have to modify
the TX keyboard)...
I suspect this might also work fort machines like the TRS80 model IVP...and
similars...
Claude
>---------- Forwarded message ----------
>Date: Mon, 19 Mar 2001 11:20:53 -0500
>From: Club 27 <thomas_disher(a)sympatico.ca
<mailto:thomas_disher@sympatico.ca
<mailto:thomas_disher@sympatico.ca> > >
>Subject: Need Tandy 6000 Keyboard
>
>Dear Museum founder: Have a Tandy 6000 HD system operating in Xenix.
>Have all the original 8 ? " floppies for the OS, and for 'Scripsit' (Word
>Processing), and for 'Unify' (a RDMS) -- including all the Owners Manuals,
>and even the Technical Service Manual. However, I really need to keep
>this old mini-computer working for another 2 years before I pass it along
>to some collector or museum.
> I am prepared to make a deal (YOU can set the terms) with the
>individual who is directly instrumental in providing the assistance I need
>to keep my keyboard operational or who can assist me to acquire one or
>preferably two old keyboards for this unit. The problem is that the
>individual key contacts are failing, one after another. They are easily
>repaired/replaced-but I have run out of the ability to switch the sound
>contact pads from the seldom used redundant keys to those that have
>failed. I am unable to find a source for these wee electrical contacts,
>and am looking to - beg, borrow or steal, or buy - a whole keyboard or two
>from which I can pirate the needed parts.
> Can you help me, and/or redirect me ? What would be your terms ?
>Tom - at Club 27
>
