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
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
In einer eMail vom 12.02.00 22:42:55 (MEZ) Mitteleurop?ische Zeit schreibt
mrdos(a)swbell.net:
> I recently acquired a Honeywell Level 6 Mainframe, printer, and numerous
> terminals. I was wondering if anyone had any software, documentation, or
> general knowledge of it. Any help would be greatly appreciated.
>
I have a Bull DPS-6000, which really is a Honeywell. If there would be a
correspondence between the machines, I would have docs and software.
Do you have any idea if these might be the same machine ?
Regards
John G. Zabolitzky
P.S. Any takers for the Convex so far ?
If anybody needs one, I've got this old suitcase-sized SMD tester. If
you're planning to do any maintenance I'm told they're useful. I got this
only a few weeks before getting rid of the last of my SMD hardware. That
was twenty years ago. I've never had occasion to use it. THe only place I
ever used SMD was on my old Systems Group S-100 setup, together with a Konan
SMC-100 controller.
Dick
-----Original Message-----
From: jeff.kaneko(a)juno.com <jeff.kaneko(a)juno.com>
To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org>
Date: Saturday, February 12, 2000 7:42 PM
Subject: CDC 9448 "Phoenix" Spares Kit
>Guys:
>
>I have a bunch of stuf that (more or less) makes up
>a spares kit for the the CDC 9448.
>
>Stuff includes:
>
>I/O Circuit Card
>CNTL/MUX Card
>Servo Coarse Board
>Servo Fine Board
>Read/Write Card
>Extender Board
>3 R/W Heads
>Maintainence Manual (including schematics).
>
>As far as I can tell, all of this stuff is
>new, except for maybe one of the R/W heads.
>I can't use it, maybe someone here can.
>
>If there's any interest in this, please contact me
>privately.
>
>
>Thanks.
>
>
>Jeff
>
>
>
>________________________________________________________________
>YOU'RE PAYING TOO MUCH FOR THE INTERNET!
>Juno now offers FREE Internet Access!
>Try it today - there's no risk! For your FREE software, visit:
>http://dl.www.juno.com/get/tagj.
In a message dated 2/12/2000 7:14:14 PM Pacific Standard Time,
rigdonj(a)intellistar.net writes:
> arked "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?
>
My 1983 Almac catalog says they are 16K ROMs, organized as 2048X8. The 'A'
is 550 ns., 5 V., 368mW. Since they say proto I suspect they are
pre-programed ROMs.
Paxton
-----Original Message-----
From: Megan <mbg(a)world.std.com>
To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org>
Date: Saturday, February 12, 2000 9:28 PM
Subject: Re: RX01 Bootstrap Loader
>
<snip>>Taken with what you mentioned elsewhere in the message, I suspect
that
>XXDP does PIO while RT uses interrupt-driven IO
That's right. You can set the vector to anything you want (well, almost) and
XXDP will boot and talk to the console - no matter the kind. M9312 will talk
to a single interrupt teletype card as it too does PIO. I find that out
every time I pull out a DL11-W and the vectors get messed up because the dip
switches brush against another board.
DEC *must* have done something for customers who did not wish to upgrade
their old KL11s (M780 cards).
After going through tech notes and FCOs I found that DEC switched from
M780 -> M782 -> M7821 . Since a DL11-B,C,E, or -W can not be installed in
the PDP-11/20 (because no +15V) a decision was made to add a G8000 module
that would filter the 8V lamp voltage and use it as +15, add a couple of
wires.. and a DL11 with EIA could work.
As a result of RT11, DEC produced a new interrupt module M7820 (old one was
M782). The new module handled two interrupts. :-)
I just found a box of them :-) and the PDP-11/20 just booted RT11-V3.0B!!!
and.. I just tried to boot RT11-V4.00 . Boots okay but there is not enough
memory to run Basic. Those MM11-Es are a dogs breakfast. I can live with
tuning 4K of core memory in a PDP-8 but tuning a bunch of core sets in a
pdp-11!??!?! Yuck.
executing "Show All" returns the mini is a "PDP-11/15,20 Processor".. after
that it says "no device 012056". Guess I have to sysgen a 30b and a 4 for
the 11/20s.
>, and without the other
>interrupt working, it won't work. I have an idea of how it could be made
>to, though... contact me off-line...
Thanks for the help...
I am happy that the PDP-11/20s will continue to use the initial KL11 board
set but I will contact you off list so that maybe the original M782 module
can be used.
john
PDP-8 and other rare mini computers
http://www.pdp8.com
>
> Megan Gentry
> Former RT-11 Developer
>
>+--------------------------------+-------------------------------------+
>| Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com |
>| Unix Support Engineering Group | (home): mbg!world.std.com |
>| Compaq Computer Corporation | addresses need '@' in place of '!' |
>| 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ |
>| Nashua, NH 03062 | "pdp-11 programmer - some assembler |
>| (603) 884 1055 | required." - mbg |
>+--------------------------------+-------------------------------------+
>
>
>
-----Original Message-----
From: Megan <mbg(a)world.std.com>
To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org>
Date: Saturday, February 12, 2000 9:28 PM
Subject: Re: RX01 Bootstrap Loader
>
<snip>>Taken with what you mentioned elsewhere in the message, I suspect
that
>XXDP does PIO while RT uses interrupt-driven IO
That's right. You can set the vector to anything you want (well, almost) and
XXDP will boot and talk to the console - no matter the kind. M9312 will talk
to a single interrupt teletype card as it too does PIO. I find that out
every time I pull out a DL11-W and the vectors get messed up because the dip
switches brush against another board.
DEC *must* have done something for customers who did not wish to upgrade
their old KL11s (M780 cards).
After going through tech notes and FCOs I found that DEC switched from
M780 -> M782 -> M7821 . Since a DL11-B,C,E, or -W can not be installed in
the PDP-11/20 (because no +15V) a decision was made to add a G8000 module
that would filter the 8V lamp voltage and use it as +15, add a couple of
wires.. and a DL11 with EIA could work.
As a result of RT11, DEC produced a new interrupt module M7820 (old one was
M782). The new module handled two interrupts. :-)
I just found a box of them :-) and the PDP-11/20 just booted RT11-V3.0B!!!
and.. I just tried to boot RT11-V4.00 . Boots okay but there is not enough
memory to run Basic. Those MM11-Es are a dogs breakfast. I can live with
tuning 4K of core memory in a PDP-8 but tuning a bunch of core sets in a
pdp-11!??!?! Yuck.
executing "Show All" returns the mini is a "PDP-11/15,20 Processor".. after
that it says "no device 012056". Guess I have to sysgen a 30b and a 4 for
the 11/20s.
>, and without the other
>interrupt working, it won't work. I have an idea of how it could be made
>to, though... contact me off-line...
Thanks for the help...
I am happy that the PDP-11/20s will continue to use the initial KL11 board
set but I will contact you off list so that maybe the original M782 module
can be used.
john
PDP-8 and other rare mini computers
http://www.pdp8.com
>
> Megan Gentry
> Former RT-11 Developer
>
>+--------------------------------+-------------------------------------+
>| Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com |
>| Unix Support Engineering Group | (home): mbg!world.std.com |
>| Compaq Computer Corporation | addresses need '@' in place of '!' |
>| 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ |
>| Nashua, NH 03062 | "pdp-11 programmer - some assembler |
>| (603) 884 1055 | required." - mbg |
>+--------------------------------+-------------------------------------+
>
>
>
"What does the formatter box look like?"
Pertec formatters are about 3" high very boring looking rack mounted
boxes. They may have been used with an internal 2315 style disc interface
in the 316. The drives themselves are 2.5 mb (or 5 if there's a fixed
disc underneath the removable) 2315 style devices. If they're the original
Pertec Blue, I would suspect someone would want them for their Altair 8800b's
Well I discovered the problem. The extender arm that is engaged by the
cartridge when it is inserted has been bent. (Perhaps someone tried to
shove a cartridge in without the handle lifted.) Anyway, without a
replacement part the TK50 is not going to work again. Strangely, I went
into another pile and came up with another E4 rev TK50 that had a different
problem thinking that I might get the piece I need. No such luck, the
mechanisms are quite different. There must be a zillion ECOs on the TK50, I
don't think any two out of 6 present are identical. Well I've got four
working ones and two dead ones. Other than the leader grabber, what other
parts might be good salvage? (The hulks will stay in my scrap pile but at
least they are now 'down for the count.')
--Chuck
I have several TRS-80 user manuals with the original software to trade or
sell. I would like to trade them for something of a vintage computer nature.
I'm a general collector of vintage computers so anything of interest will be
considered. If no one wants them, then I'll stick them on Ebay. These
manuals are all in good condition, and the disks are all 5.25 size.
1. Model 4 Disk Sciptsit Ver. 1.00 -this is a word processing program for
the TRS-80 Model 4.
It lets you type, proof-read, revise, print, and save. This program is in
it's original :SFD
box, with the user manual, reference card, registration card, etc., and
the original software
disk (for TRSDOS 6.01.00.) (1983)
2. Model 4 TRSDOS 6.2 Utilities Manual -this is the original large, brown
vinyl notebook binder
(catalog #26-0315.) It includes the original TRSDOS 6.2 Utilities disk,
in the inner sleeve
pocket. (1983)
3. Model 1/3 Hard Disk Operating System Manual -this is the original large,
brown vinyl notebook
binder (catalog #26-1130.) This manual explains how to setup, install,
and operate the Hard
Disk System using LDOS, on the Model 1 and Model 3 computers. This is a
thick user manual, and
it includes two original disks -Model 3 Hard Disk Operating System LDOS
Ver. 5.1.3, and the
Model 3 Hard Disk Operating System Initialization Disk LDOS Ver. 5.1.3.,
in the inner sleeve.
4. Model 4 Disk System Owner's Manual -this is the original large, brown
vinyl notebook binder
(catalog #26-0316 I think.)This manual explains how to use the Model 4
(with floppy disks,)
and how to use TRSDOS Ver. 6. It includes the original TRSDOS Ver. 6 and
BASIC Interpreter
Disk. (1983)
5. Model 4 VideoTex Plus User Manual -this is the original large, brown
vinyl notebook binder
(catalog # 26-1598.) This manual is in three parts -the Dow Jones
Information Service User
Guide, the CompuServe Information Service User Guide, and the VideoTex
Plus User Guide.
VideoTex Plus is a communications program for communicating with
information services, and
other host computers. It includes the original VideoTex Plus program disk
for TRSDOS 6.
(1983.)
6. Model 4p (portable) -original MODELA/III File program disk -for use with
TRSDOS 1.3 only.
(catalog # 700-3213.)
7. Several non-original program disks on Radio Shack TRS-80 Brand Floppy
disks. I don't know what
versions or OS these disks are but they are for the TRS-80 (Model
unknown)
-PFS Report on bootable disk
-PFS File on bootable disk
-PFS File Backup (non bootable)
-VisiCalc on bootable disk
-VisiCalc on bootable disk (2nd)
-VisiCalc Backup (non bootable)
-Scriptsit on bootable disk
-BASIC 2c GoldKey Revision 1.03.00 (3/85)
Let me know if you're interested, and you can contact me directly at
ernestls(a)home.com or leucoplast(a)seanet.com.
Thanks,
Ernest
