IBM PC XT

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martinw
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IBM PC XT

Postby martinw » Sat Mar 18, 2017 1:08 pm

I've always fancied one of these since I was on my sandwich degree placement in France at Alcatel and there was one, or maybe a couple in the workshop, it was a long time ago, late 80's, early 90's.

It needs a bit of a clean ...

Inside.jpg


... but it looks like it's working :shock:

Buddies.jpg


Does anybody know what it's booting into and how I get out of it to look at what's on the hard drive?

Screen.jpg


This thing is pretty impressive for the early 1980s :shock: 8)

Martin

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hoglet
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Re: IBM PC XT

Postby hoglet » Sat Mar 18, 2017 1:44 pm

It's actually booting into IBM Basic :shock:

I have a couple of original IBM PCs (Model 5150). They have different hard drive interface cards. One contains a BIOS extension ROM, and that allows the BIOS to recognise the hard drive on boot. The other contains no ROM, and the hard drive is ignored. I think in the later case you have to boot IBM DOS from floppy and the floppy is expected to contain additional drivers.

What model number is yours? IBM 5160?

Dave

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martinw
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Re: IBM PC XT

Postby martinw » Sat Mar 18, 2017 2:06 pm

Hi Dave,

Yes it's a 5160.

As it boots (after it's checked the memory), the floppy drive light comes on for a second, then the hard drive light for a second, then this pops up.

Do you think it's from the hard drive, or a ROM?

Martin

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hoglet
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Re: IBM PC XT

Postby hoglet » Sat Mar 18, 2017 2:08 pm

martinw wrote:Yes it's a 5160.

As it boots (after it's checked the memory), the floppy drive light comes on for a second, then the hard drive light for a second, then this pops up.

Do you think it's from the hard drive, or a ROM?

I think it's from ROM.

Dave

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hoglet
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Re: IBM PC XT

Postby hoglet » Sat Mar 18, 2017 2:17 pm

There is some useful info on 5160 BIOS versions here:
http://www.minuszerodegrees.net/5160/bi ... isions.htm

The later ones support larger (720K and 1.2MB) floppy disks.

Dave

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martinw
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Re: IBM PC XT

Postby martinw » Sat Mar 18, 2017 2:33 pm

Thanks for that Dave :D

Martin

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Re: IBM PC XT

Postby martinw » Sun Mar 19, 2017 8:14 pm

Woohoo the hard disk is now working and full of stuff! Including games !!! :shock: :D 8)

Digger.jpg


Although I'm having to use the composite output at the moment, anybody got any suggestions for a good CGA monitor?

Martin

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martinw
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Re: IBM PC XT

Postby martinw » Mon Mar 20, 2017 8:59 am

They don't make em like this anymore ...

12th May 1986.jpg

Chassis Plus Motherboard.jpg

Chassis.jpg

Colour Graphics Card.jpg

Everything Back In.jpg

Floppy Drive Controller.jpg

Floppy Drive Unit.jpg

Hard Drive Controller.jpg

Hard Drive Unit.jpg


...

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martinw
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Re: IBM PC XT

Postby martinw » Mon Mar 20, 2017 9:01 am

...

Motherboard.jpg

Parrallel Port.jpg

Serial Port.jpg

Tape Backup Controller.jpg

Tape Backup Unit.jpg

IBM Personal Computer.jpg


It was funny it so reminded me of building personal computers from bits in the noughties 8)

Martin

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SimonSideburns
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Re: IBM PC XT

Postby SimonSideburns » Mon Mar 20, 2017 1:24 pm

I do love the look of full size 8-bit ISA cards.

This was back when it must have worked out a whole lot cheaper to build stuff out of standard logic chips instead of custom ULAs or the like.

At one point I had a clone XT with 20Mb HDD and 1 full height 5.25" floppy with a hercules monitor and if I remember rightly the Hercules graphics card also included the parallel printer port. Seemed such a strange combination.

If I remember rightly, there was a TSR you could load that allowed the Hercules card to emulate CGA (there were plenty of pixels available) and it represented each pixel of a CGA screen by 4 (2x2) Hercules ones, so it even showed the difference in colours by dithering the pixels.

It allowed you to play some simple CGA based games on the XT and I don't recall it being all that much slower.

The particular machine I had even included a turbo mode to change from the default 4.77 MHz to something like 8 Mhz.

I don't remember what I ever used it for (probably not a lot) but I think I smashed it to bits for the pure hell of it once I'd moved on to newer and faster systems, which was a real shame and something I deeply regret. The thing was built so solidly it would likely have outlived me still working perfectly.
I'm writing a game where you can change your character from a Wizard to a monkey to a cat.

Well, Imogen that!

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martinw
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Re: IBM PC XT

Postby martinw » Mon Mar 20, 2017 4:00 pm

Interesting stuff Simon =D>

I don't know how you smashed it to bits though, must have been with a sledge hammer as it's very well made and weighs a bleeding ton :shock:

I think I'm going to try it with my spare CUB monitor, although I won't get the benefit of the "intensity" signal I don't think.

The fan bearings have gone in the PSU fan so I'll be replacing that eventually.

Martin

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Re: IBM PC XT

Postby SarahWalker » Mon Mar 20, 2017 5:57 pm

Very nice!

It might be worth sticking with composite for now - there are quite a few games that support 16 colours on composite CGA.

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martinw
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Re: IBM PC XT

Postby martinw » Mon Mar 20, 2017 8:29 pm

Thank you Sarah, that's good to know, I didn't realise (so I may have to swap between the two now) ... although I have realised why I have 3 CUB monitors in my possession, one for the Beeb, one for the Master and now one for the IBM PC XT 8)

Buddies II.jpg


Cub Monitor III.jpg


I knew it would come in useful at some point =D>

Triplets.jpg


Martin

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martinw
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Re: IBM PC XT

Postby martinw » Sat Mar 25, 2017 1:04 pm

I've been buying a bit more stuff for this PC and also doing a bit more work on it too.

Cleaned out the PSU (was full of 30 odd years of dust).
PSU Cleaned.jpg


Installed a new fan (after drilling out the old rivets), really quiet now compared to what it was like :D
New Fan Installed.jpg


Also had a change of heart on the monitor ... now it's 4K :shock:
CGA On 4K Monitor 1.jpg


I bet in 1983 the person who wrote this software never thought it would look like this! 8)
CGA On 4K Monitor 2.jpg


CGA on a 4K monitor :lol: :lol: :lol: :lol:

Martin

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-B-
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Re: IBM PC XT

Postby -B- » Mon Mar 27, 2017 8:43 am

Hello,
I made a CGA to RGB SCART converter for use with my XT clones (Sinclair PC200 and Olivetti PC1) based on the first of the circuits on this site....
http://www.geeksden.info/Sinclair/PC200/CGA2SCART.html

I then have a SCART to HDMI and VGA converter so I can use the many spare VGA monitors I have.

Image

Image

Neil
BBC Model A, BBC Model B, Electron MRB AP3/4 AP6 MGC, PC128S.

Prime
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Re: IBM PC XT

Postby Prime » Mon Mar 27, 2017 9:45 am

martinw wrote:I've been buying a bit more stuff for this PC and also doing a bit more work on it too.

Cleaned out the PSU (was full of 30 odd years of dust).
PSU Cleaned.jpg

Installed a new fan (after drilling out the old rivets), really quiet now compared to what it was like :D
New Fan Installed.jpg

I Have a couple of those Schrack PSUs fail in the same way where they would run the fan but be otherwise dead, on putting a meter accross the output I found that the (I think) 12V line was shorted to GND, the culpret was the gold coloured capacitor in the centre of the picture of the PSU open.

Cheers.

Phill.

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Re: IBM PC XT

Postby SimonSideburns » Mon Mar 27, 2017 1:27 pm

Doesn't Starquake look good. Never knew it was published on the PC.
I'm writing a game where you can change your character from a Wizard to a monkey to a cat.

Well, Imogen that!

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martinw
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Re: IBM PC XT

Postby martinw » Mon Mar 27, 2017 5:59 pm

-B- wrote:Hello,
I made a CGA to RGB SCART converter for use with my XT clones (Sinclair PC200 and Olivetti PC1) based on the first of the circuits on this site....
http://www.geeksden.info/Sinclair/PC200/CGA2SCART.html

I then have a SCART to HDMI and VGA converter so I can use the many spare VGA monitors I have.

Image

Image

Neil


Nice 8)

Martin

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martinw
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Re: IBM PC XT

Postby martinw » Mon Mar 27, 2017 6:00 pm

Prime wrote:
martinw wrote:I've been buying a bit more stuff for this PC and also doing a bit more work on it too.

Cleaned out the PSU (was full of 30 odd years of dust).
PSU Cleaned.jpg

Installed a new fan (after drilling out the old rivets), really quiet now compared to what it was like :D
New Fan Installed.jpg

I Have a couple of those Schrack PSUs fail in the same way where they would run the fan but be otherwise dead, on putting a meter accross the output I found that the (I think) 12V line was shorted to GND, the culpret was the gold coloured capacitor in the centre of the picture of the PSU open.

Cheers.

Phill.


Good to know ... thanks :D

Martin

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martinw
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Re: IBM PC XT

Postby martinw » Thu Mar 30, 2017 8:04 am

30 year old hard drive still going strong :D

Hard Disc Contents.jpg


No Bad Blocks.jpg


Clean Bill Of Health.jpg


20 Meg Hard Drive Stats.jpg


Martin

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vanpeebles
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Re: IBM PC XT

Postby vanpeebles » Fri Mar 31, 2017 3:19 pm

You could spin those old winchesters up on a Sunday and read/write all week :lol:


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