In case anyone is interested:
I have posted the utilities I created to read paper tapes to my site in the
Software/Images section (near the bottom of the main page):
Paper Tape Reader (PTR) reads data from a reader connected to a PC
parallel port. It was tested with an OAE OP-80A, however it should work
with any reader which provides parallel data, a "data ready" strobe, and
accepts an ACK pulse to reset for the next byte.
Paper Tape Compare (PTC) is a utility to identify differences between
paper tape image files. It a little brighter than "comp" for examining
paper tape streams - useful to confirm multiple reads.
Source code is included so you can modify to suit your own setup as
required.
I have also started a section of Paper Tape Images - currently only the
processor technology VDM drivers are there, however I anticipate obtaining
and reading addional tapes later this fall - as always, submissions to the
archive from other sources would be very welcome.
--
dave06a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Collector of vintage computing equipment:
http://www.classiccmp.org/dunfield/index.html
Roger Merchberger wrote:
Ah, no. The latest transfer rate is Ultra 320 - it's been out for at least
a few years now.
>I think the 80 pin SCA is only a matter of the hot plug
>spec and connector, and can be dealt with by adapters
>from the 50 pin or 68 pin cables to the SCA back
>plane connectors. It also deals with the device address
>in the connector.
Although there are 50-pin to 80-pin adapters, remember that 50-pin is only
an 8-bit-wide bus and so your throughput would not be any faster than with
an 8-bit-wide device (of the same bandwidth).
Hope this helps,
Roger "Merch" Merchberger
------------------------------------------------------------------------
Billy:
I first started working on Ultra 320 at Quantum in 1999; but they never
shipped a product until 2001. 160 wasn't a clean intro - lots of
controller/system problems. Don't know how 320 was on initial release, but
given the same cast of characters, it might have been rough too.
SCA 80 pin has a lot of adaptors to go to/from 68 pin. I even have an old
Apple system using an SCA drive on a 50 pin bus via an adaptor PCB. If
using SCA, key point to remember is that power is inside the 80 pin
connector. SCA drives don't normally have the legacy 4 pin Molex power
connector.
And I'm surprised that nobody has mentioned the early Apple SCSI, that was
25 pin. I'm still using some 50 to 25 pin cables on my G4 to drive some old
Epsom scanners. And even have one scanner on an Initio wide controller
doing a double conversion, 68 pin to 50 pin, then a 50 pin to 25 pin cable!
SCSI is FUN! - Old lapel pin I picked up at some Comdex.
Billy
Roy J. Tellason wrote:
________________________________
I've been going through a whole mess of stuff trying to get a CD burner
working here, one I have won't work at all, one won't open and close its
drawer reliably, and what I finally got to work was an external unit, a
Yamaha CRW4260tx. Not new, but hey, it works...
The thing is, I've currently got it hooked up by having the cover off,
using
a 50-wire ribbon cable from the rear of the actual drive assembly to the
internal connector of the Adaptec 2940 that's in the computer, which also
has its cover off. I'd like to put the covers on again, particularly since
someone mentioned in here that cooling is critical with those drives, but
to
do that I need the right cable.
The person I got this stuff from gave me *all* of their SCSI stuff, they
ssy.
And included in that was a ribbon cable, but that's apparently for internal
use as it has three connectors on it and they're all the same size. I do
have the book for the burner handy, and the cable shown in there is round.
And the connector on the burner (2 of them actually) is *smaller* than the
external connector on the 2940, I don't know exactly what you'd call this
one.
Anybody have such a cable they'd be willing to part with? I don't have much
cash to work with at all, but could probably cover postage, or maybe trade
some stuff.
--------------------------------------------------------------------
Roy,
I've read this twice but couldn't figure out which cable you need. Where
does the cable go - drive to external box, external box to PC connector or
internal to PC? How many pins on each end, what kind of connector etc.
I can help you, albeit slowly, since the stuff is up North, 400 miles away.
I have three of the Yamaha units that you are welcome to. I'll even ship
them free. But all three have a bad laser diode. It was one of the early
burner designs and has a limited number of on-hours. I really liked the
Yamaha externals, but they wore out quickly.
The flat cable with the three connectors was used on one of the Yamaha boxes
to go from the drive to the TWO connectors on the back of the external box.
My other two Yamahas had the two rear connectors soldered together with
loose wires going into a 50 pin connector plugged into the back of the
drive.
I also have boxes of SCSI cables, all types, and terminators. But because
of the wide variation in types, I need to know exact pin count and connector
types. I have a few down here in Orange County, so maybe we'll be lucky.
Just send me a detailed description.
So let me know exactly what you are looking for. And if you want the other
Yamahas, I'll be going up 3rd week in October and can send them to you then.
Billy
>Date: Tue, 26 Sep 2006 19:19:55 -0400
>From: "Roy J. Tellason" <rtellason at verizon.net>
>On Tuesday 26 September 2006 07:03 pm, Sridhar Ayengar wrote:
>> Roy J. Tellason wrote:
>> >> I do have the book for the burner handy, and the cable shown in there
>> >> is round. And the connector on the burner (2 of them actually) is
>> >> *smaller* than the external connector on the 2940,
>>
>> If I'm right that you're running a 2940W (or 2940UW or 2940U2W) instead
>> of a 2940, the cable you're looking for is HONDA68 -> HONDA50 *with
>> high-byte termination*.
>
>I understand the need for the high-byte termination you mention here, as that
>may be at the root of some of the problems that I've seen others mention in
>this thread. What I don't understand is why a card that has only a 50-pin
>internal connector would have a 68-pin connector on the external bracket.
>
>It also came as a bit of a surprise to me that when I pulled out my box of
>those cards I found that even though all three of them had the same model
>number that they were apparently three different cards...
Adaptec used the same circuit board for several different products.
In every case the circuit board has the same markings, but by
populating the board in different ways they made different products.
I'm going from memory here, so if I get some details wrong feel free
to nitpick me.
The 2940UW has an external HD68 pin connector with screw fasteners
and internally it has an IDC50 ribbon cable connector and a 68 pin
ribbon cable connector.
The 2940U has an external HD50 connector (with clips) and an IDC50
ribbon cable connector internally.
The Macintosh version of the 2940UW is just like the PC version,
except it has a 1Mb (as opposed to 512Kb) Flash chip programmed with
different firmware.
There was also a Sun version of the card with Open Firmware code on
board. You used to be able to download the firmware updater back in
the good old days when Adaptec had a very comprehensive ftp site
accessible to the public (why did so many companies shut down their
public ftp sites?).
I think there was also a differential (HVD) version of that card on
that board, but I may be misremembering.
The 2940 (no U) is a slightly different card because there's only a
position on board for a DIP packaged Flash (or EPROM) chip and no
PLCC nor (I think) SOIC position.
To further complicate matters there were at least two later variants
of the 2940UW, the 2940UW Dual and the 2940UW Pro. AFAICT, these
two later variants used a different controller chip than the
X940U[W]. The X940U[W] uses an AIC-7880. I think the two later
variants use a 7895, but that's a low reliability memory on that last
part number.
While the 2940UW uses a 68 pin external connector with screw
fasteners, there are versions of the 68 pin external connector with
clips. It is found on the FWB (Stream Logic) NuBus JackHammer SCSI
card, for example. And 68 pin external terminators exist in both
variants to correspond with both types of connectors found in the
wild.
Jeff Walther
> Out of interest, are the stats for daily list traffic recorded anywhere?
>I've not seen any obviously missing messages, I just don't seem to be
>seeing much list traffic right now (since hopping the pond a couple of
>weeks back and using a different ISP)
The digests haven't been quite right, I've missed a couple (issue 51 just recently), so it's possible that stuff's being lost somewhere.
>
>Subject: RX02 Problem solved...
> From: Gary E Kaufman <gkaufman at the-planet.org>
> Date: Tue, 26 Sep 2006 22:10:26 -0400
> To: cctalk at classiccmp.org
>
>Tony and others -
>
>The head load pad looks visually fine. The head load spring tension
>appears pretty normal , and the solenoid pulls in nicely.
>
>The drive consistently reads the first 10 or so tracks, then tosses
>various number of errors as it goes further out.
>
>I've cleaned the head, and cleaned/lubed the spindle. The track 0
>sensor appears fine.
Also make sure the rails the head travels on are clean. The whole
mess should move very smoothly.
>It is indeed possible that the alignment is off - that would probably
>explain the poor performance as it steps out.
If it's bad on the outer tracks then it will be bad elsewhere. The only
way it can get worse is if the lead screw or the follower is worn to the
point of looseness.
>I guess a worn out head would have the same symptoms.
That can be visually inspected under a magnifier. Never seen that happen.
> I the 70's I had a neat Dysan digital alignment disk that I used to
>realign a few SA901 and SA801 drives.
>Unfortunately I no longer have it. I suppose I could mark the position
>of the stepper and slightly rotate it in each direction to see if it
>improves things.
Shugart made one too.
>
>If someone can point me to an actual alignment procedure I'm game - I
>have reasonable scopes etc here.
Without the disk or a known good disk you not going to get the best results.
Allison
>
>Subject: Re: RX02 Problem solved...
> From: "Roy J. Tellason" <rtellason at verizon.net>
> Date: Tue, 26 Sep 2006 13:35:52 -0400
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>On Monday 25 September 2006 03:30 pm, Allison wrote:
>> Before I'd run out and kill a RX. I'd try cleaning and relubing the
>> leadscrew and making sure the head load pad is still there.
>>
>> I had one that once both were taken care of it was perfect.
>
>Speaking of head load pads, way back when I was still bumping into a lot of
>single-sided stuff I had one heck of a time tracking any of those down. I
>have *no* idea now, several decades later, where the heck I got 'em from.
>Are they available anyplace? And how critical are their characteristics,
>anyhow?
>
>Not that I have any particularl *need* for them right now, just wondering...
I use a peice of felt, real stuff not any of the cheap fakes..
Allison
>
>Subject: RS DRAM chips?
> From: "Roy J. Tellason" <rtellason at verizon.net>
> Date: Tue, 26 Sep 2006 13:43:48 -0400
> To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org>
>
>I have some chips here, I'm pretty sure they're DRAM, marked with both a
>Motorola logo and a "T/C" (Tandy Corp.?) logo, and with the part number
>8040016 followed by what I'm pretty sure is a data code of QQ8301. Anybody
>know what these are, exactly?
>
>I have a bunch of them, and no particular use for them, if anybody needs
>some, though I'm curious as to what they are.
Those are moto housenumbered 4116 16kx1 three voltage dynamic rams used in
TRS80 and other machines of the time. Note: RS used slow parts.
Allison
Hey Guys,
I have several PCBs that have damaged runs. The damage was done as a result of dirt/moisture in contact with the boards while energized. I am going to fix the boards by splicing a short piece of copper wire to the existing runs, bridging the section where the run is broken. That's no problem.
In order to physically secure the patch to the board and protect the exposed copper from corrosion, I need to apply some kinda coating / adhesive. What would you recommend? I don't want to spray the whole board with lacquer or anything like that. Just the areas where the copper is exposed. I was wondeing if something like fingernail polish would work? Any suggestions?
Thanks, SteveRob
