12 Apr
2017
12 Apr
'17
10:51 a.m.
So, I just picked up an MISE from Bartlett Labs (cause I really liked
the M3SE I had) and decided to revive one of my TRS-80 MOdel I's.
In my box of "stuff" I found an interesting ribbon cable the function
of which I don't know. It is a 40 pin to 50 pin ribbon cable with a
black box connecting them that is labeled TANDY. I know of nothing
the Tandy made that used a 50 pin connector other than a hard disk.
Could that be what this is for? Anybody ever seen one? I no longer
have any Tandy External HD's but then, with things like MISE and FreHD
why would one still want one other than for nostalgia.
bill
12 Apr
12 Apr
11:31 a.m.
On Wed, Apr 12, 2017 at 3:51 PM, Bill Gunshannon via cctalk
<cctalk at classiccmp.org> wrote:
So, I just picked up an MISE from Bartlett Labs (cause I really liked
the M3SE I had) and decided to revive one of my TRS-80 MOdel I's.
In my box of "stuff" I found an interesting ribbon cable the function
of which I don't know. It is a 40 pin to 50 pin ribbon cable with a
black box connecting them that is labeled TANDY. I know of nothing
the Tandy made that used a 50 pin connector other than a hard disk.
Could that be what this is for? Anybody ever seen one? I no longer
have any Tandy External HD's but then, with things like MISE and FreHD
why would one still want one other than for nostalgia.
bill
Although I never had one, I beleive Tandy made an adapter that plugged
into the Model 1 expansion bus (40 pin) and gave you a (cut down?)
Model 3 expansion bus (50 pin). As you suggest it was commonly used
to connect Model 3 hard disks to the Model 1, but I think it worked with
some other devices too.
-tony
11:37 a.m.
On Apr 12, 2017, at 11:31 AM, Tony Duell via cctalk <cctalk at classiccmp.org>
wrote:
On Wed, Apr 12, 2017 at 3:51 PM, Bill Gunshannon via
cctalk
<cctalk at classiccmp.org> wrote:
Maybe...
The only device I know of like that was trs80 to a printer (Centronics or compatible ).
Allison
So, I just picked up an MISE from Bartlett Labs (cause I really liked
the M3SE I had) and decided to revive one of my TRS-80 MOdel I's.
In my box of "stuff" I found an interesting ribbon cable the function
of which I don't know. It is a 40 pin to 50 pin ribbon cable with a
black box connecting them that is labeled TANDY. I know of nothing
the Tandy made that used a 50 pin connector other than a hard disk.
Could that be what this is for? Anybody ever seen one? I no longer
have any Tandy External HD's but then, with things like MISE and FreHD
why would one still want one other than for nostalgia.
bill
Although I never had one, I beleive Tandy made an adapter that plugged
into the Model 1 expansion bus (40 pin) and gave you a (cut down?)
Model 3 expansion bus (50 pin). As you suggest it was commonly used
to connect Model 3 hard disks to the Model 1, but I think it worked with
some other devices too.
-tony 
3:15 p.m.
>> of which I don't know. It is a 40 pin to
50 pin ribbon cable with a
>> black box connecting them that is labeled TANDY. I know of nothing
>> the Tandy made that used a 50 pin connector other than a hard disk.
On Wed,
12 Apr 2017, Parent Allison via cctalk wrote:
Maybe...
The only device I know of like that was trs80 to a printer (Centronics or compatible ).
Radio Shack used 34 pin for "Centronics" compatible printer cables.
(#26-1401 was a cable with 34 pin card edge to 36 pin Blue Ribbon)
3:38 p.m.
On Wed, Apr 12, 2017 at 8:15 PM, Fred Cisin via cctalk
<cctalk at classiccmp.org> wrote:
There was a 'cable' (containing a few TTL ICs) to link a Centronics
printer to a Model 1 CPU/keyboard unit without needing an expansion
interface.
It was in 2 parts. The short one included the logic and had a 40 pin edge
connector on a short length of ribbon cable connected to the box
containing the logic. The PCB in said box had a _40 way_ card edge coming
out through the side with a slot after 34 contacts. There was a longer cable
with a 40 way edge connector (with a polarising key after 34 contacts,
between the contacts) on one end and a 36 pin microribbon connector
(to go to the printer) on the other. You connected the long cable to the card
edge on the box of logic, plugged the short cable from that into the expansion
bus connector on the keyboard and plugged the other end of the long cable
into the printer (which had to supply the +5V needed for the logic in the
cable).
If you then bought an EI, you could connect the long cable (only) to the
34 pin card edge on the EI.
The only problem was that if you did this, you couldn''t fit the 'hood'
over
the connector (as it was designed for a 34 pin connector). And the cable
didn't fit the M3 or M4.
I had one. In the end (after getting an EI and later a M3), I replaced
the connector
with a 34 pin one. It then didn't fit the original short cable/logic
(which I had no
use for), but did work with the EI and M3.
-tony
>> of
which I don't know. It is a 40 pin to 50 pin ribbon cable with a
>> black box connecting them that is labeled TANDY. I know of nothing
>> the Tandy made that used a 50 pin connector other than a hard disk.
On Wed, 12 Apr 2017, Parent Allison via cctalk wrote:
Maybe...
The only device I know of like that was trs80 to a printer (Centronics or
compatible ).
Radio Shack used 34 pin for "Centronics" compatible printer cables.
(#26-1401 was a cable with 34 pin card edge to 36 pin Blue Ribbon) 
10:13 p.m.
Descriptions are in French, but Google Translate works well enough.
Model I Buffered EI Cable (40 to 40 pin):
http://prof-80.fr/carte-tandy-1700077-c/buffered-ei-cable
http://prof-80.fr/carte-tandy-1700077-c/buffered-ei-cable/prototype-buffer-…
(Schematics and Gerbers available)
Model I Printer Interface Cable (40 to 40 pin):
http://prof-80.fr/interface-parallele
http://prof-80.fr/interface-parallele/prototype-printer-interface
(Schematics and Gerbers available)
Model I Hard Disk Adapter (40 to 50 pin):
http://prof-80.fr/interface-hd-modele-1-n-26-1132
Scott.
10:29 p.m.
On Wed, Apr 12, 2017 at 10:13 PM, Scott Kevill via cctalk <
cctalk at classiccmp.org> wrote:
Descriptions are in French, but Google Translate works
well enough.
Model I Buffered EI Cable (40 to 40 pin):
http://prof-80.fr/carte-tandy-1700077-c/buffered-ei-cable
http://prof-80.fr/carte-tandy-1700077-c/buffered-ei-cable/
prototype-buffer-expansion
(Schematics and Gerbers available)
Model I Printer Interface Cable (40 to 40 pin):
http://prof-80.fr/interface-parallele
http://prof-80.fr/interface-parallele/prototype-printer-interface
(Schematics and Gerbers available)
Model I Hard Disk Adapter (40 to 50 pin):
http://prof-80.fr/interface-hd-modele-1-n-26-1132
Scott.
I have some of these above described cables if anyone is interested,
contact me directly with what you're looking for. I actually did not know
what the 40 to 50 pin cables were for either :-) I thought they were all
for some sort of printing only.
Bill
13 Apr
13 Apr
8:23 p.m.
On 4/12/2017 10:13 PM, Scott Kevill via cctalk wrote:
Descriptions are in French, but Google Translate works
well enough.
Model I Buffered EI Cable (40 to 40 pin):
http://prof-80.fr/carte-tandy-1700077-c/buffered-ei-cable
http://prof-80.fr/carte-tandy-1700077-c/buffered-ei-cable/prototype-buffer-…
(Schematics and Gerbers available)
Model I Printer Interface Cable (40 to 40 pin):
http://prof-80.fr/interface-parallele
http://prof-80.fr/interface-parallele/prototype-printer-interface
(Schematics and Gerbers available)
Model I Hard Disk Adapter (40 to 50 pin):
http://prof-80.fr/interface-hd-modele-1-n-26-1132
Nope, it's none of those.
bill
9:07 p.m.
> Model I Hard Disk Adapter (40 to 50 pin):
> http://prof-80.fr/interface-hd-modele-1-n-26-1132
On Fri, 14 Apr 2017, Bill
Gunshannon via cctalk wrote:
Nope, it's none of those.
Can you describe in what ways it differs?
14 Apr
14 Apr
8:31 a.m.
On 4/13/2017 9:07 PM, Fred Cisin via cctalk wrote:
OK. I just opend the little plastic box.
It isn't shown, but I assume the end of the cable is a female
edge connector. Your other end is a male coming out of the box.
I have cables on both ends both ending in female connectors.
The PC board shows two resistors and two transistors. Mine has
four resistors and two disk capacitors.
Obviously not even similar.
On another note, the box is labeled "To EI Screen Printer Port".
Not sure what that means as the EI has a "Line Printer Card Edge"
and not something specific to the Screen Printer.
bill
> Model I
Hard Disk Adapter (40 to 50 pin):
> http://prof-80.fr/interface-hd-modele-1-n-26-1132
On Fri, 14 Apr 2017, Bill
Gunshannon via cctalk wrote:
Nope, it's none of those.
Can you describe in what ways it differs? 
9:11 a.m.
-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Bill Gunshannon via
cctalk
Sent: Friday, April 14, 2017 8:32 AM
To: cctalk at classiccmp.org
Subject: Re: TRS-80 curiosity
On 4/13/2017 9:07 PM, Fred Cisin via cctalk wrote:
<SNIP>
> Model I Hard Disk Adapter (40 to 50 pin):
> http://prof-80.fr/interface-hd-modele-1-n-26-1132
On Fri, 14 Apr 2017, Bill
Gunshannon via cctalk wrote:
Nope, it's none of those.
Can you describe in what ways it differs? On another note, the box is labeled "To EI Screen
Printer Port".
Not sure what that means as the EI has a "Line Printer Card Edge"
and not something specific to the Screen Printer.
Well, that explains it all then.
http://www.trs-80.org/trs-80-screen-printer/
The screen printer connected to the expansion interface via a dedicated cable.
9:35 a.m.
On Apr 14, 2017, at 9:11 AM, Kelly Leavitt via cctalk <cctalk at classiccmp.org>
wrote:
The EI expansion port was originally called the Screen Printer port because that was the
only accessory that connected directly to the TRS-80 bus.
I?m not sure if this cable was for the Screen Printer as I always thought that was a
straight through cable. But, the manuals do not indicate either way.
On another note, the box is labeled "To EI
Screen Printer Port".
Not sure what that means as the EI has a "Line Printer Card Edge"
and not something specific to the Screen Printer.
Well, that explains it all then.
http://www.trs-80.org/trs-80-screen-printer/
The screen printer connected to the expansion interface via a dedicated cable.
11:15 a.m.
On Fri, 14 Apr 2017, Peter Cetinski via cctalk wrote:
The EI expansion port was originally called the Screen
Printer port
because that was the only accessory that connected directly to the
TRS-80 bus.
Originally.
Later, the Voice Output device (repackaged Votrax?) used the bus
connector.
Later, the Voice Input device used the bus connector.
After we (Elcompco) built a 4 port "Bus Extender" (with active
termination), we found that the Voice Input device had a hidden
undocumented pass-through of the bus. All essential to connecting an X-10
interface and being able to say, "LET THERE BE LIGHT!", with a response of
X-10 "all lights ON", and a voice responce of "BY YOUR COMMAND". Thus
demonstrating the level of practical applicability of a home computer.
12:30 p.m.
On Apr 14, 2017, at 11:15 AM, Fred Cisin via cctalk
<cctalk at classiccmp.org> wrote:
On Fri, 14 Apr 2017, Peter Cetinski via cctalk wrote:
Correct, originally.
Lot?s of 3rd party devices that connected to the bus appeared soon thereafter. A few
interesting ones I have other than the Voice Synthesizer and the Vox Box are an Exatron
Stringy Floppy and a Cryptext hardware encryption device.
The EI expansion port was originally called the
Screen Printer port because that was the only accessory that connected directly to the
TRS-80 bus.
Originally.
Later, the Voice Output device (repackaged Votrax?) used the bus connector.
Later, the Voice Input device used the bus connector.
12:53 p.m.
On Fri, 14 Apr 2017, Peter Cetinski wrote:
Lot?s of 3rd party devices that connected to the bus
appeared soon
thereafter. A few interesting ones I have other than the Voice
Synthesizer and the Vox Box
Those were sold under the Radio Shack name. There were also some similar
and better ones from third parties.
are an Exatron Stringy Floppy and a Cryptext
hardware encryption device.
There was a software intensive third party expansion bus serial printer
interface early on.
It was supplanted by the TRS-232 (cassette port to serial printer!)
(Not to be confused with numerous other products named "TRS-232")
In Googling for it, I stumbled on
http://ianmav.customer.netspace.net.au/trs80/
who makes a Model 1 to hard disk cable, a doubler, a CP/M "mapper", etc.
9:57 a.m.
On 4/14/17, 2:31 PM, "cctech on behalf of Bill Gunshannon via cctech"
<cctech-bounces at classiccmp.org on behalf of cctech at classiccmp.org> wrote:
OK. I just opend the little plastic box.
It isn't shown, but I assume the end of the cable is a female
edge connector. Your other end is a male coming out of the box.
I have cables on both ends both ending in female connectors.
The PC board shows two resistors and two transistors. Mine has
four resistors and two disk capacitors.
Obviously not even similar.
On another note, the box is labeled "To EI Screen Printer Port".
Not sure what that means as the EI has a "Line Printer Card Edge"
and not something specific to the Screen Printer.
Bill
Does it look like the cable in this eBay listing:
http://www.ebay.com/itm/Radio-Shack-TRS-80-Screen-Printer-26-1151-w-Sealed-
Paper-Manual-EXTREMELY-RARE-/201867426619?
10:36 a.m.
________________________________________
From: Camiel Vanderhoeven [camiel.vanderhoeven at vmssoftware.com]
Does it look like the cable in this eBay listing:
http://www.ebay.com/itm/Radio-Shack-TRS-80-Screen-Printer-26-1151-w-Sealed-
Paper-Manual-EXTREMELY-RARE-/201867426619?
_____________________________________
Sorry, I didn't see any cable in that item. Just an extremely overpriced printer.
Or should I say firestarter?
bill
10:40 a.m.
On 4/14/17, 4:36 PM, "cctalk on behalf of Bill Gunshannon via cctalk"
<cctalk-bounces at classiccmp.org on behalf of cctalk at classiccmp.org> wrote:
________________________________________
From: Camiel Vanderhoeven [camiel.vanderhoeven at vmssoftware.com]
Does it look like the cable in this eBay listing:
http://www.ebay.com/itm/Radio-Shack-TRS-80-Screen-Printer-26-1151-w-Sealed
-
Paper-Manual-EXTREMELY-RARE-/201867426619?
_____________________________________
Sorry, I didn't see any cable in that item. Just an extremely overpriced
printer.
Or should I say firestarter?
bill
Terribly overpriced, I agree. The cable is shown in the 4th photo (from
the back of the printer)
10:46 a.m.
On Apr 14, 2017, at 10:36 AM, Bill Gunshannon via
cctalk <cctalk at classiccmp.org> wrote
Sorry, I didn't see any cable in that item. Just an extremely overpriced printer.
Or should I say firestarter?
bill
Here's the pic of the cable
http://imgur.com/UhvJ2Ed
12:58 p.m.
________________________________________
From: Peter Cetinski [pete at pski.net]
Sent: Friday, April 14, 2017 10:46 AM
To: Bill Gunshannon; General Discussion: On-Topic and Off-Topic Posts
Subject: Re: TRS-80 curiosity
On Apr 14, 2017, at 10:36 AM, Bill Gunshannon via cctalk <cctalk at
classiccmp.org<mailto:cctalk at classiccmp.org>> wrote
Sorry, I didn't see any cable in that item. Just an extremely overpriced printer.
Or should I say firestarter?
bill
Here's the pic of the cable
http://imgur.com/UhvJ2Ed
_________________________________
That's it. I was pretty sure it wasn't for a hard disk.
Now I know it's worthless.
bill
10:54 a.m.
On Fri, 14 Apr 2017, Bill Gunshannon via cctalk wrote:
The PC board shows two resistors and two transistors.
Mine has
four resistors and two disk capacitors.
Obviously not even similar.
Possibly very similar, Have you counted the pin numbers to determine
which traces the parts are connected to?
If the component resistors, transistors and capacitors perform compatible
"buffering" functions, they may be functionally compatible.
Both designs sound like kludges to deal with problems that surfaced when
straight-through cables were used.
If you count pins and identify the components, or take a picture, then
Allison might be able to identify the details!
On another note, the box is labeled "To EI Screen
Printer Port".
Not sure what that means as the EI has a "Line Printer Card Edge"
and not something specific to the Screen Printer.
That's due to a fluke in TRS-80 history.
Even before the EI was available, RS had a "screen printer" that connected
to the 40 pin expansion bus of the CPU.
"To avoid confusion", and to avoid explaining what a bus was,
RS therefore, called that 40 pin connector the "Screen Printer Port".
http://www.trs-80.org/trs-80-screen-printer/
It sold for $599 (as much as the computer!)
That continued to be available for a while after the EI came out. Owners
of it "had to be" supported. The EI has a continuation of the 40 pin
expansion bus. But, rather than try to explain it, RS simply showed them
a picture of where the EI 40 pin expansion bus "continuation"/"output"
connector was, and told them to plug their 40 pin screen printer into that
connector. "To avoid confusion", and to avoid explaining what a bus was,
RS therefore, called that 40 pin connector the "EI Screen Printer Port".
Because RS had PROBLEMS with the EI,
http://www.trs-80.org/radio-shack-expansion-interface/
they ended up coming out with multiple versions of the cabling,
including the "Screen Printer" cable specifically including "buffered"
cable with a box.
I think that the screen printer cable was 40 pin to 40 pin?
They also made a 40 pin to 34 pin adapter for connecting "Centronics
style" printers to the CPU bus. It also would probably have been labelled
"screen printer port",
http://www.trs-80.org/printer-interface-cable/
One 50 pin to 40 pin adapter would be the one to connect the screen printer to
the model 3. Insane thing to do, but we, the TRS-80 users, were rarely
accused of sanity.
Another 50 pin to 40 pin adapter would be Model 1 to hard disk. The
connector on that for the model 1 would probably have been labeled "EI
Screen Printer Port".
All of these cables would have been easiest to build as a board with two
gold-plated card-edge connectors, and then use female card-edge to female
card-edge cables for connection (except 26-1401 female card-edge to
"blue-ribbon" for "Centronics style" printers). But, RS cut corners
and
did not gold-plate the EI connectors! That came back to bite them on the
ass (similarly to the way Apple's crappy sockets bit them), and therefore,
rather than risk another card-edge bad connection, some of their stuff was
made with attached cables, instead.
--
Grumpy Ol' Fred cisin at xenosoft.com
1:10 p.m.
________________________________________
From: cctalk [cctalk-bounces at classiccmp.org] on behalf of Fred Cisin via cctalk [cctalk
at classiccmp.org]
Sent: Friday, April 14, 2017 10:54 AM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: TRS-80 curiosity
On Fri, 14 Apr 2017, Bill Gunshannon via cctalk wrote:
The PC board shows two resistors and two transistors.
Mine has
four resistors and two disk capacitors.
Obviously not even similar.
Possibly very similar, Have you counted the pin numbers to determine
which traces the parts are connected to?
If the component resistors, transistors and capacitors perform compatible
"buffering" functions, they may be functionally compatible.
Both designs sound like kludges to deal with problems that surfaced when
straight-through cables were used.
If you count pins and identify the components, or take a picture, then
Allison might be able to identify the details!
On another note, the box is labeled "To EI Screen
Printer Port".
Not sure what that means as the EI has a "Line Printer Card Edge"
and not something specific to the Screen Printer.
That's due to a fluke in TRS-80 history.
Even before the EI was available, RS had a "screen printer" that connected
to the 40 pin expansion bus of the CPU.
"To avoid confusion", and to avoid explaining what a bus was,
RS therefore, called that 40 pin connector the "Screen Printer Port".
http://www.trs-80.org/trs-80-screen-printer/
It sold for $599 (as much as the computer!)
That continued to be available for a while after the EI came out. Owners
of it "had to be" supported. The EI has a continuation of the 40 pin
expansion bus. But, rather than try to explain it, RS simply showed them
a picture of where the EI 40 pin expansion bus
"continuation"/"output"
connector was, and told them to plug their 40 pin screen printer into that
connector. "To avoid confusion", and to avoid explaining what a bus was,
RS therefore, called that 40 pin connector the "EI Screen Printer Port".
Because RS had PROBLEMS with the EI,
http://www.trs-80.org/radio-shack-expansion-interface/
they ended up coming out with multiple versions of the cabling,
including the "Screen Printer" cable specifically including
"buffered"
cable with a box.
I think that the screen printer cable was 40 pin to 40 pin?
They also made a 40 pin to 34 pin adapter for connecting "Centronics
style" printers to the CPU bus. It also would probably have been labelled
"screen printer port",
http://www.trs-80.org/printer-interface-cable/
One 50 pin to 40 pin adapter would be the one to connect the screen printer to
the model 3. Insane thing to do, but we, the TRS-80 users, were rarely
accused of sanity.
Another 50 pin to 40 pin adapter would be Model 1 to hard disk. The
connector on that for the model 1 would probably have been labeled "EI
Screen Printer Port".
All of these cables would have been easiest to build as a board with two
gold-plated card-edge connectors, and then use female card-edge to female
card-edge cables for connection (except 26-1401 female card-edge to
"blue-ribbon" for "Centronics style" printers). But, RS cut corners
and
did not gold-plate the EI connectors! That came back to bite them on the
ass (similarly to the way Apple's crappy sockets bit them), and therefore,
rather than risk another card-edge bad connection, some of their stuff was
made with attached cables, instead.
___________________________________________
Well, I don'c consider something passive (having only inert parts) to be
similar to a device with active parts, but that's just my opinion. :-)
Mine is 40 pin to 50 pin, definitely for the Model I and looks exactly like the
Screen Printer cable in the last picture I was sent.
I just cheked both the manual and looked at the E/I itself and the Line
Printer Port is 34 pins and Centronics signals so no special cable there.
I know that was the case on the Model 3 and Model 4.
bill
1:45 p.m.
On Fri, 14 Apr 2017, Bill Gunshannon via cctalk wrote:
Well, I don'c consider something passive (having
only inert parts) to be
similar to a device with active parts, but that's just my opinion. :-)
dissimilar designs can be done for functionally compatible systems.
Mine is 40 pin to 50 pin, definitely for the Model I
and looks exactly like the
Screen Printer cable in the last picture I was sent.
Great! Curiousity assuaged.
I had thought that both ends of the Screen printer cable would be 40 pin,
That's why I had speculated on Model 3.
But I never spent $599 for one.
(instead, I struggled with interfacing a DTC-300 HyType 1 serial printer)
I just cheked both the manual and looked at the E/I
itself and the Line
Printer Port is 34 pins and Centronics signals so no special cable there.
I know that was the case on the Model 3 and Model 4.
Yes, the model 1, 3, and 4 parallel printer ports ("Line Printer Port")
are essentially the same. If you examine the circuitry in the interfaces,
you might not think that they are "similar" :-) They all use the
#26-1401 printer cable (34 pin IDC card-edge to 36 pin "blue ribbon")
My homemade 34 pin to 50 pin cables for 8" drives (crimp with a couple of
wires moved) is functionally similar to D-Bit's FDADAP, but electrically
dissimilar, in that I don't implement TG43, when used in a read-only
situation. If that were to have been available at the time, it would
have saved me a lot of wasted time bread-boarding a totally unnecessary
"break-out".
9:16 p.m.
On 15/04/2017, at 1:45 AM, Fred Cisin via cctalk <cctalk at classiccmp.org> wrote:
I had thought that both ends of the Screen printer
cable would be 40 pin, That's why I had speculated on Model 3.
But I never spent $599 for one.
(instead, I struggled with interfacing a DTC-300 HyType 1 serial printer)
I never had a Screen Printer either, but I don't think it would even be possible to
use with a Model III.
I assumed the way it worked on the Model I was by either watching the CPU bus and sniffing
writes to the video memory (mirroring to its own copy continuously), or reading the video
memory when needed (trickier with synchronisation).
Unfortunately, despite the Model III having 50 pins instead of 40, 25 of them were ground
and A0-A7 of the address lines were exposed. Even that was only enabled for IO ports via
software first. The Model I was much for flexible for add-ons.
Scott.
12 Apr
12 Apr
11:45 a.m.
Isn't this the buffered expansion cable?
2017-04-12 12:31 GMT-03:00 Tony Duell via cctalk <cctalk at classiccmp.org>:
On Wed, Apr 12, 2017 at 3:51 PM, Bill Gunshannon via
cctalk
<cctalk at classiccmp.org> wrote:
So, I just picked up an MISE from Bartlett Labs (cause I really liked
the M3SE I had) and decided to revive one of my TRS-80 MOdel I's.
In my box of "stuff" I found an interesting ribbon cable the function
of which I don't know. It is a 40 pin to 50 pin ribbon cable with a
black box connecting them that is labeled TANDY. I know of nothing
the Tandy made that used a 50 pin connector other than a hard disk.
Could that be what this is for? Anybody ever seen one? I no longer
have any Tandy External HD's but then, with things like MISE and FreHD
why would one still want one other than for nostalgia.
bill
Although I never had one, I beleive Tandy made an adapter that plugged
into the Model 1 expansion bus (40 pin) and gave you a (cut down?)
Model 3 expansion bus (50 pin). As you suggest it was commonly used
to connect Model 3 hard disks to the Model 1, but I think it worked with
some other devices too.
-tony
11:51 a.m.
On Apr 12, 2017, at 11:45 AM, Alexandre Souza via cctalk <cctalk at classiccmp.org>
wrote:
That cable had the same connector on both ends and labels! The later version added a pair
of cables with 5pin connectors. Later they redesigned the EI to work right as the early
versions were timing critical for the Dram (bad implemntation).
Allison
3:36 p.m.
So, I just
picked up an MISE from Bartlett Labs (cause I really liked
the M3SE I had) and decided to revive one of my TRS-80 MOdel I's.
In my box of "stuff" I found an interesting ribbon cable the function
of which I don't know.? It is a 40 pin to 50 pin ribbon cable with a
black box connecting them that is labeled TANDY.? I know of nothing
the Tandy made that used a 50 pin connector other than a hard disk.
Could that be what this is for?? Anybody ever seen one?? I no longer
have any Tandy External HD's but then, with things like MISE and FreHD
why would one still want one other than for nostalgia.
bill
Although I never had one, I beleive Tandy made an adapter that plugged
into the Model 1 expansion bus (40 pin) and gave you a (cut down?)
Model 3 expansion bus (50 pin). As you suggest it was commonly used
to connect Model 3 hard disks to the Model 1, but I think it worked with
some other devices too.
-tony
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alexandre.tabajara＠gmail.com -
allisonportable＠gmail.com -
ard.p850ug1＠gmail.com -
bill.gunshannon＠hotmail.com -
billdegnan＠gmail.com -
camiel.vanderhoeven＠vmssoftware.com -
cisin＠xenosoft.com -
kelly＠catcorner.org -
pete＠pski.net -
scott＠kevill.com