Author Topic: IBM 5150 Restoration (Read 45398 times)

simmiv · « **Reply #25 on:** May 11, 2015, 12:29:03 pm »

Hi,
If you are still getting the memory errors, it's hard to continue with booting the floppy as it may fail.. I see you were getting 1054 201 error at bootup.. The service manual map to follow is this one.. http://www.minuszerodegrees.net/hms/HMS%20-%206280087%20-%20Maps%20-%200200.pdf It seems to take you the check the switch settings..
Rgds,
Simmi

simmiv · « **Reply #26 on:** May 11, 2015, 12:44:27 pm »

Hi, I also noticed that you have memory chips in all the rows, thus you should have 64kb of RAM.. The bootup says 28,363 bytes, which might indicate the MB switch settings are set to 32kb and the last two rows aren't switched on.
Simmi

TheEPROM9 · « **Reply #27 on:** September 01, 2018, 01:39:01 am »

joeqsmith · « **Reply #28 on:** September 01, 2018, 02:44:15 am »

Good to see you have not given up on the old PC. Have a look at the first board I show and see if it looks like the one you are asking about.

https://www.eevblog.com/forum/vintage-computing/old-ibm-compatible-pcxtat-cards/

TheEPROM9 · « **Reply #29 on:** September 08, 2018, 10:20:47 pm »

I try & work on it when I get time. Just lead a bussy life these days.

chris_leyson · « **Reply #30 on:** September 08, 2018, 11:32:23 pm »

Good luck with the restoration. Wow holy crap that brings back memories. Not a bad machine for it's day and well hackable and a lot of software was still wrtten in assembler. I bought an IBM PC for something crazy like £900 with a CGA monitor back in the day. Stuffed a Hercules graphics card in and used a Hanterex green screen monitor with a long persistance phosphor, P39 maybe. Now you're talking hi-res graphics. Popped a hard disk controller in and a 6Mbyte hard drive so now I've nearly got an XT. Put some half height floppy drives in and punch a hole in the sleve now I've got 720k floppires, overclock it and it's nearly an IBM AT. A few years later and I managed to fit an IBM AT mother board into the chassis. Those were days.

I think back then the 110W power supply was a classic Royer converter or more accurately a Jensen converter which was a more efficient improvement on the Royer. The saturating base drive transformer was smaller and wired in parallel with the main transformer. Also, avoid the IBM MDA display adaptor, the horizontal drive wasn't free running and needed a video signal to work properly, the other gotcha was the two screws hidden under a label which held the CRT PCB in place, oops.

The 5161 expasion card with the crazy 68 way connector, damn, should have kept it, isn't hindsight wonderfull. Also passed up an opportunity on original ring bound service manuals

TheEPROM9 · « **Reply #31 on:** September 22, 2018, 06:39:51 pm »

Thanks for all the links guys =-)

I am curently working on part 8. I have fixed the RAM issues & now have 64KB of working RAM. Just need to sort out a working boot disk. Lubed the drives today.

TheEPROM9 · « **Reply #32 on:** October 06, 2018, 08:54:04 pm »

Quote from: TheEPROM9 on September 22, 2018, 06:39:51 pm

Thanks for all the links guys =-)

I am curently working on part 8. I have fixed the RAM issues & now have 64KB of working RAM. Just need to sort out a working boot disk. Lubed the drives today.

Oh yes, disks arrived on Friday =-)

TheEPROM9 · « **Reply #33 on:** October 08, 2018, 08:29:03 pm »

It is now time for Part 8. =-)

We finaly have it booting from IBM DOS 3.3 =-)

pamperchu · « **Reply #34 on:** October 09, 2018, 01:50:38 am »

If you ever need parts hit me up.

TheEPROM9 · « **Reply #35 on:** October 09, 2018, 07:03:50 pm »

Quote from: amyk on April 15, 2015, 02:35:22 pm

Do you have a CGA for it?

If so, try this demo:

I have it fully working, came with a CGA card. Challenge acepted. Need to up the RAM & probaly add some king of HDD, the original ones might be to far gone to use. So a solid state solution would be best there.

w9gb · « **Reply #36 on:** October 20, 2018, 01:15:02 am »

Now I feel old.
The IBM PC model 5150 (5-slot) was a year old,
when I entered graduate college (IBM-XT with 8-slots was current). IBM AT released in 1984, BUT was on allocation due to high demand. RAM was scarce, so IBM used “pickyback ICs” (128k) for the first version of 6 MHz motherboards.

AST 6-Pack with additional RAM, serial (RS-232) port, parallel port, and clock/calendar that IBM excluded was very popular add-on card. AST used the TI 1488/1489 line driver/receiver for second serial port.

The engineering, computer science, and business colleges built computer lab (summer 1983) using IBM PCs (DOS 2.0) with 3Com Ethernet cards (ThinNet, 10-Base-2).
In 1983, this Ethernet lab at Univ. of Iowa had an Altos 986 (8086, 10 MHz) with an Ethernet card designed by 3Com server as network’s file server. It used 3Com’s file server software under Xenix 3.0 (eventually marketed by 3Com as 3Server).
https://blog.fosketts.net/2007/06/25/storage-history-the-3server/

Worked summer and weekends for local IBM PC dealer.

eugenenine · « **Reply #37 on:** October 23, 2018, 12:13:29 am »

I had a 5150PC and an XT before I moved about 10 years ago. They were both in the pile of things I have to leave behind.

TheEPROM9 · « **Reply #38 on:** November 05, 2018, 10:11:51 pm »

Quote from: eugenenine on October 23, 2018, 12:13:29 am

I had a 5150PC and an XT before I moved about 10 years ago. They were both in the pile of things I have to leave behind.

That's sad =-(

nad007007 · « **Reply #39 on:** March 08, 2019, 09:48:53 am »

yes dam it

Sam Hobbs · « **Reply #40 on:** August 01, 2019, 09:49:51 pm »

I have an IBM XT 286. I have not turned it on for more that 20 years but it probably still works. I probably should find someone to care for it. My main concern is that I am not sure the hard drive was parked. It was upgraded with memory for Xenix and I still have the Xenix. I do not have a monitor for it. I think I used the keyboard for many years with newer systems.

chris_leyson · « **Reply #41 on:** August 01, 2019, 10:21:08 pm »

I can't remember for sure but the IBM MDA display MUST be plugged into a PC when it is powered up. The line oscillator does not free run and needs a horizontal sync signal from the PC display adaptor board. I had to repair a failed MDA display some 35+ years ago which was just a case of replacing the line driver transistor. I don't think the issue applied to CGA monitors.

james_s · « **Reply #42 on:** August 01, 2019, 11:01:31 pm »

I had an XT model 286 years ago, I gave it away around 20 years back and kind of regret it but on the other hand what do I really need it for? I think I still have the manual for it, neat machine and quite rare.

Stray Electron · « **Reply #43 on:** August 01, 2019, 11:22:47 pm »

Quote from: cncjerry on April 23, 2015, 08:01:25 am

Wow, I can tell you stories about the 5150 and it's predecessors. I worked in software development for IBM in 1980 on a temporary assignment for two years. I met Don Estridge,

I wonder what happened to all those PCs and the infamous Pc Jr?

The PC Jr was a piece of toy crap! I bought a "MS DOS compatible" Sanyo 550 instead

. After battling with their incompatible Sanyo DOS for a year I bought the first true IBM clone that hit the market.

People probably don't remember it but Don Estridge was killed in the notorious Delta Airlines flight 191 in Houston in 1985. My sister was supposed to be on the same flight but missed it so the whole event sort of sticks in my mind.

I still have an IBM PC along with many of the original IBM software packages for it, including such oddities as Ryan-McFarland Fortran, IBM APL, IBM Cobol, the IBM and the National Instruments package with the HP-IB interfaces, Poly Forth by Charles Moore, and a package of every version of DOS from 1.1 up. I used to have a package of DOS 1.0 but someone swiped it. My PC has both an AST Six-Pak card and a Hard Card in it. :-)

joeqsmith · « **Reply #44 on:** August 10, 2019, 01:04:54 am »

Hey, you finally got it running!! Congratulations!!

TheEPROM9 · « **Reply #45 on:** August 11, 2019, 05:35:32 pm »

Quote from: Stray Electron on August 01, 2019, 11:22:47 pm

Quote from: cncjerry on April 23, 2015, 08:01:25 am
Wow, I can tell you stories about the 5150 and it's predecessors. I worked in software development for IBM in 1980 on a temporary assignment for two years. I met Don Estridge,

I wonder what happened to all those PCs and the infamous Pc Jr?

The PC Jr was a piece of toy crap! I bought a "MS DOS compatible" Sanyo 550 instead . After battling with their incompatible Sanyo DOS for a year I bought the first true IBM clone that hit the market.

People probably don't remember it but Don Estridge was killed in the notorious Delta Airlines flight 191 in Houston in 1985. My sister was supposed to be on the same flight but missed it so the whole event sort of sticks in my mind.

I still have an IBM PC along with many of the original IBM software packages for it, including such oddities as Ryan-McFarland Fortran, IBM APL, IBM Cobol, the IBM and the National Instruments package with the HP-IB interfaces, Poly Forth by Charles Moore, and a package of every version of DOS from 1.1 up. I used to have a package of DOS 1.0 but someone swiped it. My PC has both an AST Six-Pak card and a Hard Card in it. :-)

Still, would be an intresting story none the less.

TheEPROM9 · « **Reply #46 on:** August 11, 2019, 09:37:22 pm »

Thanks all for the feedback, still need to fix the expansion unit, but I have recently moved house & am still setting up my workshop. I finaly have my own workshop ;-)

w9gb · « **Reply #47 on:** October 16, 2019, 12:52:01 pm »

I would consider taking it (XT 286) ... remember it when I worked summers first an IBM dealer.
Odd little machine (IBM 286 put into an IBM PC/XT case).

gb


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Author Topic: IBM 5150 Restoration (Read 45398 times)

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