">""AMD AM9217APC". I can't find a reference to them, does anyone know
>what they are?"
>
>2k x 8 static RAMs. Are they 24 pin?
Yes.
"
Sorry about that. Upper left corner of page 1186 of the 1979 IC
Master says "ROM" not "RAM"
gee... wonder what the bits in the ROMs were for?
On Feb 13, 14:14, Allison J Parent wrote:
> <marked "AMD AM9217APC". I can't find a reference to them, does anyone
know
>
> The only amd I could find was 9517 (DMA controller like 8237). The 92xx
> series has memories so it could be ram or prom type device.
>
> <what they are? Also they say "Proto" below the IC number. Does that
mean
> <that these are prototypes?
>
> Very likely.
AMD used 91xx for RAM, 92xx for mask ROM (with a couple of exceptions), and
97xx for EPROM. AM9217 is an NMOS 2048 x 8-bit ROM; A is the speed
(550ns), P means 24-pin plastic, C means commercial temperature range (0-70
Celcius). Pinout is the same as an 8316, 2716 compatible, but the chip
selects on pins 18,20,21 can be specified either active-high or active-low.
The AM9217 was superceded in the late 70's by the AM9218.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
<Other finds include some kind of CPU board with a 1802 Cosmac CPU, a HP 97
Describe it more.
<marked "AMD AM9217APC". I can't find a reference to them, does anyone know
The only amd I could find was 9517 (DMA controller like 8237). The 92xx
series has memories so it could be ram or prom type device.
<what they are? Also they say "Proto" below the IC number. Does that mean
<that these are prototypes?
Very likely.
Allison
On Feb 13, 8:46, Clint Wolff (VAX collector) wrote:
> On Sat, 12 Feb 2000, Chuck McManis wrote:
>
> > 1) Does the Red Light/Button on the right hand side in the "out"
position
> > mean "unload" ?
Yes, but watch the LEDS.
> Off means unlocked (you can lift the handle and remove the tape)
> Off also means no power (you can't lift the handle and remove the tape)
> On steady means tape loaded
> Flashing means rewinding or unloading or error (Grrrr)
>
> > 2) When does the green light come on (except on power up when it is
> > unloaded.) ?
>
> When the tape is loaded and ready
You really need to look at both LEDs together. Here's the table from the
User's Guide:
Green Red Drive state
--------------------------------------------------------------------
Off Off power off
Off On 1. After power-on, this condition occurs for 5-15s while
the drive is initializing. (Red goes off and green
comes on after initialization.)
2. Indicates handle is up, following cartridge insertion.
3. Indicates tape has almost completeed rewinding, and is
approaching the unload point. Red stays on during this
sequence (8-10s).
On Off OK to lift handle
NOTE: Only under this condition is it safe to lift the
handle. Under any other condition, lifting the handle may
damage the unit or cause a fault.
On On Tape is at BOT and drive ready to accept system commands.
Flash On Indicates tape motion during normal system operation.
Flash Flash Tape is rewinding to BOT.
Flash Fast Indicates a fault condition. See Chapter 5, Solving
Flash Problems. Pushing the LOAD/UNLOAD switch FOUR times
may clear the fault.
Chapter 5 suggests trying the four-presses two or three times. If that
doesn't work, power off and then on (it says to do this only once,
actually). If that doesn't work, it suggests calling your system
administrator, Field Service, or removing the drive to send to a Service
Centre. Not very informative or helpful, really. The only chapter that's
shorter is Chapter 4, "Uses For The TK50".
The load sequence is:
If the power is off, make sure the LOAD/UNLOAD button is in the OUT
(unload) position, and power up the drive.
Let the drive initialise: the red LED should be on for between 5 and 15
seconds, and then the green LED comes on and the red one goes off.
When the green LED is on and the red is off, lift the handle. "Caution:
never lift the handle if the red LED is on or blinking."
"Smoothly and completely insert the cartridge." [the manual doesn't say
where, but I'd be tempted to find the nearest convenient member of the TK50
design team, and ask them to turn round...] When it locks in place, the
red LED should go on and the green LED off.
Lower the handle. After several seconds, the green LED should come on
steady, and the red LED should go off. At this point, it's safe to operate
the handle again to remove the cartridge, or continue to load the tape.
Push in the LOAD/UNLOAD switch (the LOAD position is IN). The tape shuold
go through the load process, taking 5-8 seconds. Both LEDs come on steady
when it reaches BOT.
To unload a cartridge:
Set the LOAD/UNLOAD switch to OUT (UNLOAD position). If the tape isn't
already at BOT, both LEDs will flash *slowly* while it rewinds. If the
tape was very cose to BOT, you might not see them flash.
The red LED comes on while the tape is unloading from BOT. This should
take 8-10 seconds, then the red LED should go off and the green should come
on.
When the red LED is off and the green is on, left the handle, which
partially ejects the cartridge.
-----
The manual has some diagrams showing how the tape leader in the cartridge
should look, and how the take-up leader in the drive should be. From what
you wrote, I don't think you have any problems here, but for the sake of
completeness... I'm not going to attempt ASCII art for this, and I'm
afraid I can't get at a scanner ATM, so I'll try to describe them:
Cartridge:
Looking at it right-side-up, with the edge with the door towards you and
the hinge at the right, you should be able to release the door lock by
lifting up the release. Swing open the door; you should see the leader on
the left, with *nearly* all of the eye in the leader showing.
Drive:
With the handle down, looking into the cartridge slot, you should see the
take-up leader, with its notch roughly in the middle of the slot. To the
left of that notch, the take-up leader should be a little less than 1/2"
wide; to the right of the notch it narrows to a fraction of that (maybe an
1/8"), with a sort of fat arrow-head on the end.
A little hook on an arm behind the takeup leader (called the buckling link)
should be hooked through the notch. Just at the back of the hook, on the
buckling link, are a couple of vertical pins which prevent the takeup
leader sliding too far back up the buckling link.
The narrow part of the takeup leader should all be in front of the link,
and straight; it should not be displaced above the link, nor tangled in it,
nor unhooked.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
>I've just found a TI PC circa 1983, 8088 cpu but not IBM compatible.
>Can't find any references to it anywhere.
>
>Is the story of this and the founding of Compaq to be found anywhere >on
>the net. I gather they are related.
>
>This one came from a very fastidious former TI employee who seems to >have
>accumulated every bit of software for it he could. Includes >UCSD P-system,
>CP/M 86 and Concurrent CP/M 86 as well as all the DOS >compilers of the
>era.
>
>Hans
Here is all I know about the history of the TI-PC.
The TI-PC was released in 1984 not too long after the world famous TI-99/4A
rolled over & died. The machine itself is a partial IBM-PC clone, but is not
completely compatible as it uses a proprietary disk format (reminds me of an
AT&T PC 6300/6400), & it's own version of DOS (TI-DOS, to be exact). The
machine reportedly had excellent graphics hardware (for the day, anyway), &
one of the best early PC keyboards anywhere. I have only seen one of these
things "in the flesh", & that was a few years ago (either 1997 or 1998) in a
getting repaired (!) in a Radio Shack. Despite all this, however, the
machine failed to sell in large quantities & was abandoned by TI in less
than a year.
____________________________________________________________
David Vohs, Digital Archaeologist & Computer Historian.
Computer Collection:
"Triumph": Commodore 64C, 1802, Double FDD, GeoRam 512, Okimate 20.
"Leela": Macintosh 128 (Plus upgrade), Nova SCSI HDD, Imagewriter II.
"Delorean": TI-99/4A.
"Monolith": Apple Macintosh Portable.
____________________________________________________________
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com
>Due to the instruction set incompatibilities between the 11/20 and other
>11s, will they even run RT11 V30B with 8K core?
RT11 V03B ought to be OK, as long as you have enough memory. I know that
12K words core is enough (I have V03B on an 11/04 with 12K core), I suspect
it will fit in 10 or 8K.
If you try to run RT-11 5.5 or 5.6 on an 11/20, you'll get some complaint
because EIS instructions found their way into a few utilities and drivers.
This has been rectified for 5.7; see the 5.7 release notes for details.
--
Tim Shoppa Email: shoppa(a)trailing-edge.com
Trailing Edge Technology WWW: http://www.trailing-edge.com/
7328 Bradley Blvd Voice: 301-767-5917
Bethesda, MD, USA 20817 Fax: 301-767-5927
I would be interested in those HP-85 manuals
(and any other 85 stuff) if you are
interested in selling them.
Mike Porter
> From: Joe <rigdonj(a)intellistar.net>
> Subject: IC question and hamfest finds
>
> Hi,
>
> Mike Haas came down from jacksonville and we went to the first day of
> the Orlando hamfest. Mike scored big time! No less than 6 different TRS
> computers. Several are like new and in their original boxs with all the
> books. He also bought several other interesting toys!
>
> I picked up all five of the original E&L BugBooks. Only on looks like it
> was ever touched. The others are all in PERFECT condition. I also picked
> up another HP 3468 digital multimeter with the HP-IL interface. :-) Also
> several NEW manuals for the HP 85 computer. Also several Tektronix manuals
> relating to HP-IB programming using the Tektronic 4051 computer. Also found
> the user's manual for the Tektronix 4662 plotter that I have to go with my
> 4051. Also found a 1982 Tektronix catalog, you can guess what it shows :-)
> Other finds include some kind of CPU board with a 1802 Cosmac CPU, a HP 97
> manual and a Heathkit 4804 Byte probe. However the most surprising find
> was five boxs full of Intel 1702 EPROMs. In one box I found several ICs
> marked "AMD AM9217APC". I can't find a reference to them, does anyone know
> what they are? Also they say "Proto" below the IC number. Does that mean
> that these are prototypes?
>
> Joe
>
> ------------------------------
Ok, so I had an old TK50Z-GA that was marked "dead" and I ripped it apart
and discovered a couple of blow caps on the "heater" board :-) (some
adjunct to the PSU) replaced those and it seems to work somewhat again
(I've not hooked it up to SCSI, just powered it up to see the drive light up)
Anyway, I took my other drive that I was powering up on the bench and by
wiggling out the TK50 connector and the power connector I can now plug this
thing in an watch it in "real time."
This has yielded a bit more information about the failure mode of the
drive. With the cover removed I can watch what the drive is doing. This is
what I've found out.
The "hook up" leader was around the spool and out of the feed path. Now
when powered up the drive turns the spool a bit and then starts spinning it
making the leader thingy go whack whack whack on the edges. (DEC weed
whacker! :-) If I re-feed the take up lead through the tape path it moves
back and forth a bit and then stops with the red light flashing.
[Note to Tim: My test tape is a scratch tape]
Then I fed the tape in manually and hooked it up to the leader. Now the
tape was taken up on the spool a bit, then it rewinds to what might be the
load point and stops. Then the red button flashes. If I try the press and
release a few times leaving it in the unpressed position the drive feeds
some time then rewinds and stops just as the end of the actual tape
(beginning of the pick up lead) reaches the capstan.
[Reference Picture : http://home.mcmanis.com/images/tk50-2.jpg ]
In the reference picture I circled in Orange where the leader stops and in
red where I cleaned with a q-tip. I've confirmed with my IR detector that
the LED in the lower right side of the picture (more toward the rear) is
emitting.
So several questions come to mind. I'll pop out some of the obvious ones...
1) Does the Red Light/Button on the right hand side in the "out" position
mean "unload" ?
2) When does the green light come on (except on power up when it is
unloaded.) ?
3) It appears that a "working" unload sequence would have the tape leader
get sucked back
into the tape and the 'unhooker' should engage the hook leader. Why
would it stop
before it got that far?
--Chuck
