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Toshiba 1200, bios image & caps values

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Hi all,
I have dug out my Toshiba T1200 in preparation for recapping and cleaning. I have not found much info on cap values and internal batteries on the net so I will post some here for future reference.

First problems with my machine are dead CMOS and RTC batteries. I mesured them and they both come dead. Gladly none leaked. I did not take these batteries appart, only mesured them and compared to avaiable ones to get cells dimensions. Part numbers and specs:

  1. CMOS: XZ0075P04, TOSHIBA 9001R, 4.8V, it is a bank of 4 1/3AA size NiCd cells, spot welded together, wired using 24AWG wire with JST PH 2mm pitch 2 pole connector, length approx 30cm, unknown capacity
  2. RTC: MEMO POWER Sealed NiCd Battery, 2-5IFT-B 129, 2.4V 50mAh by Yuasa Battery Co., LTD. This is bank of two NiCd cells spot welded together (Ø15,4x5,8mm), connected via 26 AWG wire about 17cm long. It uses the same connector as CMOS one.
  3. Main battery: MODEL NO. PA7491U, DC 7.2V 2200mAh, it seems to be 6 cell series pack. Case glued or ultrasonicly welded. It would be possible to 3D print some holder for 6pack of AA or C NiMH cells to fit.

P1550496.jpgbattery.jpg

I have taken out BIOS ROM, it is AM27C256-205DC made by AMD. I have backed up contents and attach it here. Here is pic of ceramic BIOS ROM package and main CPU by OKI, 80C86A-2 - cmos version of Intel 8086
bios_cpu.jpg

Caps are from Nichicon and Elna

List of electrolytic capacitors on PSU Board:
  1. 10uF 25V 85°C 2.5mm pitch, x1
  2. 150uF 35V 105°C 5mm pitch, x1
  3. 220uF 25V 105°C 3.5mm pitch, x1
  4. 470uF 25V 105°C 5mm pitch, x3
  5. 1800uF 10V 105°C 5mm pitch, x2


List of electrolytic capacitors on Main Board (pitch of smaller caps based on PSU small cap):
  1. 10uF 25V 85°C 2.5mm pitch, x3
  2. 33uF 25V 85°C 2.5mm pitch, x2
  3. 4700uF 10V 85°C 7.5mm pitch, x1


Power brick is 12V@2.2A center positive, rated 40W. It seems to have 6.5mm outer diameter and about 3mm inner diameter.
brick.jpg
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Expanded Memory on 286 running Wing Commander

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I'm running into an issue trying to run Wing Commander. If I load without EMS it runs fine, but without the extra effects. When I set the 286 up to use 1 mb of EMS it freezes before loading. It recognizes that there is expanded memory and that it is fully used but doesn't load. I've included a screenshot showing that EMS is setup. IMG_20181123_190731.jpg
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Black Thursday/Friday - more lamo every year?

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Seems that way to me. Nothing excites me about it anymore. Yet I always look forward to it. I mean if you obsessively horde large screen TV's then it's exciting. Yuck tv doesn't interest me. The one in the living room hasn't been on in months! I remember getting cool software, hardware, all sorts of odds and ends. I didn't even leave the house this year, until today, I had quality time to spend with strombollis.

Linux Pro Magazine 10/18 + 214 issue archive DVD

74LS30 Testing Failures

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In recovering failed or erratically functioning S-100 boards, one of the things
that I do is chip test as many of the 74xx TTL chips that I can. I use a breadboard
set up with a 555 timer and a 7493 4-bit binary counter to provide input signals for
the chips to be tested. On chips with more that 4 inputs, I pair up the inputs so
that the whole chip can be tested at one time. One thing I have noticed over time
is a high failure rate of the 74LS30 chip, even on orders of new chips from suppliers.
First, let me define 'failure' as I see it in this case. Perhaps someone can
tell me if these are in fact failures. In my testing I check first to make sure that
any chip is functioning as it is designed, and then I watch for clean HIGH-LOW
transitions in the outputs of the chips. The 74LS30, an 8-input positive-nand gate,
seems to 'fail' often in that the output doesn't do a clean HIGH-LOW transition but
instead does a HIGH-DIM-LOW transition. I have been assuming that a HIGH-DIM-LOW
transition in any chip would produce an invalid logic state in a circuit for the period
of time that the DIM state exists. So, I replace the chips that produce these results
as well as any obviously bad chips.
I find these 'failing' 74LS30 chips often on boards that I am chip testing but I
also find that in orders of 74LS30 chips, many of them are also 'failing'. I may
get as many as half or more of the chips I have ordered to produce this HIGH-DIM-LOW
output. Other chips such as the 74LS240 or 74LS244 may show the HIGH-DIM-LOW
transitions as they begin to fail but I rarely see such HIGH-DIM-LOW outputs on
orders of any other new chips. Has anyone else seen such a high failure rate in
74LS30 chips?

Phillip

How well do socket g34 amd c32 Opterons run non-server Windows OS?

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Can they run Windows XP or 7, or 8.1 without issue as a home PC or gaming PC, even though they were designed to be number crunchers? I was thinking on building a server as a home PC to have the most reliable hardware.

Also, do the multi cpu socket motherboards need a cpu terminator board installed if you want to use only one cpu?

DIP Switch Story.

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I have been working through a number of faults on some Processor Technology memory cards and I came across a familiar problem. Familiar in that I have seen it before in other equipment with gold plated switch contacts where there are no sliding motions between the contacts, just touching of surfaces and the switches are operating at low voltages & currents.

One of the contact pairs in a CTS DIP switch on a PT 16KRA board (memory address select) was not making contact even though in the on position. Spraying cleaner into it and exercising it had no effect.

It is a 40 year old switch. I removed the switch and disassembled it for inspection. In this type of switch the contacts touch by spring force until a small plastic arm pushed them apart in the off state. The contacts are Gold plated. Two types of corrosion are present. Small dark areas where the Gold had obviously failed and the phosphor bronze had gone a dark green to black color. But this was not the main problem. The gold had developed a thin white microscopic frosty-white coating. Gentle touching with a probe made from small clean conductors showed it to be an insulating layer. Even though Gold is not supposed to "oxidize" it had, microscopically at least. A small abrasive force breaks through this coating, but in this switch design the plastic that slides between the contacts was not hard enough to break the surface layer.

These are the places I seen this gold contact problem before:

1) Tektronix Oscilloscope attenuators where Gold touches Gold with no sliding.. the fix being to close the contact over a small piece of contact cleaner soaked paper and withdraw the paper parallel to the surface, so that abrasive forces from the paper clean the Gold surfaces.

2) The multiple Gold plated pins on Athlon 64 processors which reside in ZIF sockets (causing all sorts of intermittent computer failures)... the fix here is to immerse the IC in cleaner and brush the pins for 20 min and on socket re-insertion, partially close the socket locking arm while the IC is about 1mm projecting out of the ZIF socket, then push it home, the abrasive sliding forces clean the socket's gold contacts too.

3) On the gold plated target electrode of vintage single tube color cameras. When resistance develops here if creates a low pass filter with the pre-amplifier's input capacitance, the 7+ MHz carrier disappears and the picture out of the camera goes green...at least easy to clean.

Unfortunately, the DIP switches are not easy to clean. The same type and the same age switches are used on the SOL-20 motherboard, for example in the baud rate/parity circuits and other places. Of course the effect of a faulty DIP switch will only show if it happens to be one that is supposed to be on.

This suggests it would be wise to replace all of these DIP switches, or at a bare minimum make sure to check them for continuity. However, the Ram card I have with this switch fault was working initially I had thought before it failed and a section of memory dropped out. But I think I had altered its address. These 40 year old DIP switches are a recipe for intermittent problems and a big worry. They are not too difficult to remove & replace, it requires a good solder sucker.

I wonder if any DIP switches out there have a sliding contact design so they are self cleaning ?

ACME Portable PII/III, an industrial luggable

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I wanted a desktop machine that was not-too-modern to bridge the gap between my older hardware and more modern hardware. I found this on eBay and it looked like a good contender, so I ensured it!
Slot 1 PIII 850, 1GB RAM maxed from 256MB, 32GB SD up from 9GB HDD

TpiM2xZb.jpg Convenient Tote Bag

58iyxIab.jpg Rear: L/R Volume, PSU, Back panel

qmyIiwVb.jpg Access panel for Serial, Parallel, and USB. I had to cut the opening a little larger to fit the USB ports, it used to be identical to the square on the left. Originally none of these holes were used and had their blanks in place, and USB wasn't even hooked up.

htNl22sb.jpg My installed cards: GPIO, (Empty ISA), SCSI, Soundblaster, Ethernet, Dual PCMCIA, VGA, (Mouse reroute), Extra 3.5" bay left open to expose IDE cables and power, 1.44 3.5" Disk, 1.2 MB 5.25" Floppy
The dangly IDE cables and power are for imaging old drives, and/or hooking up a CD-RW if needed

UjUUhiGb.jpg Keyboard detached from front. The LCD frame was cracked, which I repaired.

uI8UQ0Bb.jpg The connectors are stowed in this little hatch. AT Mechanical Keyboard, PS/2 Touchpad Mouse

dG8i5fOb.jpg BIOS overview

VU4SPMgb.jpg I multi-boots DOS 6.22+Win3.1, Windows 98SE, Windows XP, and Arch Linux via System Commander from the SD card. Stereo speakers exist below/behind the LCD frame on the main unit.

WuAwjqEb.jpg Final iteration of my filled-out ACME Portable, an industrial luggable booted into XP.
I call it my babelfish because it has all the ports, cards, and connectors I need to interface with all my old hardware/accessories


And here is a small gallery with the original specs and cards https://imgur.com/a/tjslS9U
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Compaq LTE Lite/25 w/ Docking Station

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Proud owner of this beastly combination...

4KIUAiWb.jpg The battery still works! Featuring a 386 25MHz, 8MB RAM, 200MB HDD, 640x480 greyscale LCD (2810) Running Windows 3.11 for Workgroups

gbY8TEkb.jpg Sexy backside shot. Serial, Parallel, VGA, Expansion, Audio, Power

v83QxZSb.jpg OOPS! I accidentally UN-portableized it.

w8pWu0mb.jpg Look at that beast. 1.5x 5.25" drive bays

CQkVxzyb.jpg Industrial eject lever, phat power switch

1KedgxKb.jpg Meaty backside. Serial, 2xPS/2, Parallel, VGA -- ISA Network card (10Base2, AUI)

f30G1Wqb.jpg Had to disassemble the thing to get to the CMOS battery, I only had CR2032 on hand so I made it fit.
The case is entirely snap-together. Once inside I had to unscrew the keyboard and then everything just falls out
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Vintage Compaq SLT 286 Computer Manuals 1988 - $10

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These four pieces are original Compaq items from 1988. No tears or holes. The Battery Pack Information Card is the most bent piece but could easily be flattened out with the others. $10 plus Media Mail shipping from 80138. Thank you.

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2.jpg
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4.jpg
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6.jpg
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Dell Precision 220

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This is a old twin Pentium 3 desktop that Ive had for years then last year the PSU went and I wasnt at the time, able to track down the fault. Well i saw one come up on Ebay cheap si snapped it up. After fitting it I tried to power it up but it only turned on briefly 1-2 secs then turned off. I tried removing all drives cards etc buts still does it. I was wondering if the caps on this old thing are maybe causing this.
Everything looks good, no bulging etc and it all looks perfect. See these pictures.
Anyone know what it might be causing this?
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Symbols, Icons and Diskette Labels from Apple

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I have two things on the go here but the first is I am trying to figure out if there is somewhere online where I can find all of the little graphical elements they made over the years to indicate devices, represent notifications and program icons. Stuff like or or

At the same time I am wondering if someone has already gone and scanned in or reproduced diskette labels. I could of sworn this was a thing at one point and you could just print them out and slap them on a new floppy disk.

Pin Out for Power Supply Commodore 64 ?

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The pin out for my Commodore 64 Power Supply shows 2 = GND, 5 = +5V, 6,7 = +9V. When I put my meter probes on 2 and 5, it shows 5 Volts. However on pins 2 and 6, as well as 2 and 7, it shows 0 V. What happened to the +9 Volts? The Power Supply seems to work fine and shows games (e.g "Star Post" ) in good color and sound???

Thanks for any insight. (I'm trying to determine if a separate Power Supply has failed and should be thrown out.)

WTB: 110mhz microSPARC CPU from SPARCstation 5

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Long shot but I'm looking for the 110mhz microSPARC-II CPU from a SPARCstation 5. CPU only and one from the socket version obviously (early ones were not removable or something).

P6SBU Help

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I have a supermicro P6SBU. Board runs fine with a PII 450 installed. The manual says it supports Pentium III processors as well but my 650 and 750 both dont work on the board, both refusing to post. I know the processors are good because they work in my SE440bx2. I have also seen a few posts on vogons about this board and people running a PIII on it so I was wondering if I could get some assistance. I have tried jumper settings but no avail

Intel P1 120Mhz Processor - A80502120 SY033 - $10

Fujitsu M2553 5 1/2" floppy drive red light stays on?

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I can't get this drive to work. I know all of the cables are in correctly, and the light stays on even if it's not plugged in. Any ideas about what could be wrong? Thanks!

are the IBM PS/1 model 2011 and 2121 monitors interchangeable?

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These are the PS/1s that have the power supply for the computer built into the monitor. Does anyone know if a monitor that shipped with the newer 2121 (in this case a 386sx-20 model) fit the older 286 based 2011? the connectors appear to be the same, but i'd rather not fry something on the off chance IBM decided to change pinouts and voltages.

thanks in advance!

Help me identify this particular TRL (Royal Information Electronics) monitor

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I've recently picked up this monitor from a friend of mine.
At the rear it states that is was manufactured by Royal Information Electronics but, I'm not sure what the model number is or, what the exact specifications of the monitor is.
I know that is a colour monitor but, I'm not sure whether it also supports EGA.

I found a reference to a monitor that looks very close to this one with an indicated model number of CT-1469 (or just CT1469).
However, since there is no model number printed on the monitor, I'm not sure whether it's the same.
Another website indicates that the monitor is also EGA capable.
The horizontal positioning of the image is a bit off but, I'll look into this later. Is it possible that it's because the horizontal refresh rate of the CGA card is at 15 KHz & that it's trying to refresh at 21 KHz (EGA)?
Front.jpgRear.jpgSide.jpg
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My collection. Result of 12 years retrocomputer adventure.

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Hi to all from Moscow, Russia !)

In September, 2006 my friends were about to trash a Compaq Contura 430cx486 notebook they have found in the atticks and were sure it can't be used anymore in "modern world". I took it home - and realised then that "all that computers I dreamed of in my childhood and youth "can be found that way and maybe just gathering dust on somebody's atticks, garage or basement)
Now I have PC's from IBM 5150 to PIII's, Amiga 3000, 1989-1999 macs, Curta and good old 8-bit Kaypro-10. Here's howased on it looks at my place - I have long table for 4 vintage desktops on it, as well as place for my modern desktop. And the list of all my curent machines. In future hope to find C64, which is common, but I like it as a good 8 bit machine and soviet home computer BK11m, based on PDP-11 architecture). Of course I like good old games, then Photoshop, Corel Draw on 486-p1/macintosh Centris, learning Turbo Pascal 7.0 for dos (yes I know C is much better - hope to learn it, too). Also I try to take my computers to festivals, not only computer or retro related - to let people understand, realise that old computers are not junk - but product of human mind - as well as "oficial antiques", like 1914-1980 cars or 18-19 century watches...)

rs0.jpg

rs1.jpg


I. IBM compatible desktops/towers

01 IBM 5150 8088 4.7mhz
02 IBM 5170 286 6mhz
03 IBM PS/2 40sx 386SX
04 286/20 "AHEAD/AVGA104kb"
05 286/20
06 286/20
07 286/16 "ACU-MOS_VGA_512kb"
08 286/16 "HGA"
09 286/16 "EGA"
10 Digital Venturis 466 DX2-66
11 Digital LPV 486DX2-66
12 Digital /AMD/
13 Digital Starion 300i P1-75
14 Compaq Deskpro DX5-133
15 Compaq Deskpro P1-120
16 IBM Desktop P1
17 Mikro Mikko Ergo P1-75
18 Siemens Nixdorf P1-75
19 Dell XPS R400 PII-400/AGP
20 PIII Asus P3bf PIII-550mhz
21 P1 tower P1-166
22 PIII 1000mhz

II. IBM compatible notebooks, laptops...

23,24 Compaq Contura 430cx
25 Compaq Contura 410cx
26 Compaq Elite 486DX2-50
27 Dell P1
28 IBM Thinkpad 755CD
29 IBM Thinkpad 345c
30 Compaq Armada 1590DMT
31 Compaq Armada P1
32 Compaq Armada P1
33 Zenith p1-120
35 ZEnith 386sx
36 Texas Instruments
37 IBM Thinkpad E600
38 IBM Thinkpad T20
39 Compaq Armada M700
40 Goulipin 286 286/16/EGA

III Apple Macs



41 MacintoshIIci
42 LC III
43 Centris 650
44 PowerBook 3400
45 G3 PowerBook
45 Ibook Clamshell orange
46 8600/300
47 G3 tower (G4 ugrade)

IV "All "other" platforms" /

48 Kaypro 10(1983) Z80A/4mhz
49 Commodore Amiga 3000
50 Curta
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