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Vintage Computers Any vintage computer systems, calculators, video games etc., but with an emphasis on 1980s and earlier equipment. |
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18th Jul 2007, 11:54 pm | #1 |
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Vintage computer IBM System 2 850 3002
Hi, A customer of mine has asked me to look at a vintage IBM monitor that has gone wrong. It is an IBM System 2 850 3002.
The monitor is black and white, I cant remove the back because the two top 'screws' are non standard, or are they sockets? The other thing is that the D connector of a modern monitor wont fit because the original D plug has a number of pins missing, and the socket wont accomodate a standard plug unless some of the pins are removed. If I bought a suitable monitor cable and cut those pins, would a modern colour monitor work? If I bridged all RGB pins and remove two of the 75 ohm resistors would a colour monitor work as a black and white monitor? |
19th Jul 2007, 9:18 am | #2 |
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Re: Vintage computer
Is this a green screen affair, with two rotary controls on the right hand side of the front panel?
If so, these are very easy to mend, on the whole, resembling a mono portable TV inside, although I've had one with a mains transformer that kept tripping my RCD. Can't remember about the security screws... Could you post a pic? Nick. |
19th Jul 2007, 10:23 am | #3 |
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Re: Vintage computer
No Nick, Its Monocrome ie Black & White
I think the security screws may be nuts rather than screws. |
19th Jul 2007, 11:24 am | #4 |
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Re: Vintage computer
Is this an IBM PS/2? They usually had a 2 digit model number, e.g. PS/2 Model 35 etc. There were heaps of PS/2's - the model numbers escape me - at Otago when I was there, and even though Ernst & Young was a Compaq shop we plus we had one at the local office running the MS Mail link.
This 'model' number or the IBM product code (4 or 4-3) would be handy. Re the monitor plug - if its a PS/2 then it will be VGA or possibly MCGA. I didn't think they did any mono-only ones, but could be wrong! What pins are knocked out? Pinout info is here. EDIT: I've just re-read the original message. Is the problem with a computer or just the monitor? |
19th Jul 2007, 2:16 pm | #5 | |
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Re: Vintage computer
Quote:
The number on the computer is 850 3002 Looking at the pins on the PLUG the following pins are there look at enclosed scan. |
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19th Jul 2007, 5:08 pm | #6 |
Nonode
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Re: Vintage computer IBM System 2 850 3002
Its probably m/c type 8503. model 002.
I could be thinking of another monitor, but is this the one which has some sort of slots on the top - if so, there was a special tool to depress the latches inside and release the cover ? ( long time ago now ! ) Andy |
19th Jul 2007, 5:26 pm | #7 |
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Re: Vintage computer IBM System 2 850 3002
I've found a Dell monitor on for £5, picking it up tommorrow, I'll also get an monitor extention lead, cut the pins off the plug and see what happens. All that can happen is I'll lose a few quid.
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19th Jul 2007, 7:25 pm | #8 |
Octode
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Re: Vintage computer IBM System 2 850 3002
Took a couple of these to the dump last week, they where mono vga, used to mess about with alot of this type of stuff. i also seem to remember you had to use a special took to depress two clips in the top to remove the back cover, you could do it with a long flat blade screwdriver but it was a bit fiddly. chopping the extra pins out of a standard lead should work fine.
Jay
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19th Jul 2007, 10:15 pm | #9 |
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Re: Vintage computer IBM System 2 850 3002
There is product information on the 8503-002 monitor here, its a paper white VGA monitor from 1987.
Are there more pins in the socket on the computer? I would have thought that it was compatible with colour monitors as well. |
19th Jul 2007, 11:25 pm | #10 |
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Re: Vintage computer IBM System 2 850 3002
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20th Jul 2007, 12:38 am | #11 |
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Re: Vintage computer IBM System 2 850 3002
Would I be right in assuming you are talking about a 9-pin D-SUB connector? I recenty aquired one of those monitors, and the owner told me that if a replacement monitor was needed, one could simply cut the pins off - as you suggest. But there are adaptors out there; one of the monitors he owned had one fitted.
I have a Compaq 386 that for some reason had only fourteen holes - I simply used a drill to make another one. Perhaps you could try that? |
20th Jul 2007, 11:24 pm | #12 | |
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Re: Vintage computer IBM System 2 850 3002
Quote:
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22nd Jul 2007, 8:11 pm | #13 |
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Re: Vintage computer IBM System 2 850 3002
Success! Got monitor, drilled hole in D socket, plugged monitor in and Bingo. Another happy customer.
Does anyone want a dead monochome monitor. |
23rd Jul 2007, 7:48 am | #14 |
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Re: Vintage computer IBM System 2 850 3002
Well done Michael... and Liam
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