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Your Jumpers and Switches are Likely Incorrectly Set. The Gateway P5-120 or Intel Technical Product Summery manuals should resolve. I assume you have the Baby AT form factor installed in this Computer Case. APPENDIX B : Page 15 —> Switch 6, ON; (Switch setting for 120 MHz) Switches 7 and 8 —>...

J2A : 40-pin IDE connector (assume correct insertion J4 : 5-pin connector, DC Power W1 : BIOS Address (C800h or CA00h) W2 : I/O Port Address (320h or 324h) W3 : Interrupt Request (IRQ5 or IRQ2*) The AccuLogic sIDE-1 controller has an on-board low-level format program. To enter the program, run...

MTM Scientific (Clinton, Michigan USA) would be a good resource. https://www.mtmscientific.com/pc-retro.html Reverse engineering the original IBM 5150 (5-slot, ISA) motherboard was a substantial undertaking, as we found some differences between the 'official' circuit diagrams and actual board...

The Damaged Lock (Open) might have NOT disengaged the inner metal chassis. IBM PS/ValuePoint (1992-1995) Computers You have the “Tower” form factor (/T suffix). http://ps-2.kev009.com/psref/vpbook.pdf IBM PS/ValuePoint Hardware Maintenance Manual, September 1993...

SIEMENS (ROLM Systems) UM386-R 80386 Motherboards were the Planar Boards for the ROLM Voice Mail System. The motherboard you have (UM386-R) was from Replacement (Upgrade) Inventory, many NOS. After IBM purchased ROLM (1984), the “new” ROLM Voice Mail System used IBM AT motherboards. I believe...

NOT All Baby AT motherboards will fit into the IBM 5160 metal case. Those that are an ~ 1 inch longer than the IBM-XT motherboard will hit a metal case support for the Left Drive Bay. That piece of metal is bent down from drive bay and “Spot welded” to XT case bottom. Check dimensions before...

Which size ? 22-Slot ?

Yes, I saw these on eBay recently. Not the best place for Vintage Computing, Shipping/Logistics expensive (and Damage frequently occurs). gb

Yes, there was a couple different 3 inch formats (Sony pushed one in Japan, a couple of years). Tandy and NCR … jumped on the 5.25” QD/DS drives … by 1984 IBM AT introduced HD/DS that killed it. There was also the LS120 … that 3M pushed, but died by end of 1990s

Yes, worked for an IBM, Apple, HP, Novell, 3Com dealer (3 years early ‘80s when in graduate college). Fortunately, I was not on the Delta flight at DFW, that wiped out key IBM Boca talent. That era now seems more like a dream today (Gates, Jobs, Noorda, Metcalfe, John Young).

3M did make floppies for every 8 inch drive type, till early 1980s. PAGES 21 and 22 of the 1983 3M Catalog, that I previously posted — should answer your question. For the special 5.25 inch drive requirements (hard sector, etc.) — it largely depended on manufacturers (and market size). 3M was a...

Chuck, I have Boxes of the HP/Compaq Torx screws (which I prefer to use) AND McMaster-Carr HQ is only 1/2-mile from me (Pick-Up window to acres of parts). — BUT, as DDS noted … I sometimes get purists (former-IBM employees) … and I have seen antique/restoration judging (audio speakers, antique...

Known NVRAM issue (internal battery dead) … NO NOT THROW OUT RAM. Several YouTube DIY and external battery approaches to address. Glitchworks (Virginia, USA) has nice solution (and Sun notes). https://users.glitchwrks.com/~glitch/sun.html Making a crystal/battery replacement module for the...

Chuck, I do not know what you are objecting to, since you REPEATED what I noted. The Five (5) Cover screws were different from the 3/16” Hex washer head, used for the expansion slot panels and through out the IBM 5150, 5160, 5162, 5170 PC case for other attachments. That screw was also used in...

About 35 years ago, our purchasing agent (IBM PC dealer) tracked down the OEM supplier to IBM — so he bought 1 or 2 boxes of 100 (our service techs were sloppy in losing genuine screws). 6-32 thread; 3/8” length; Hex Washer Head, Slotted Hex Head for 1/4” drive (standard for #6 screw) The OEM...

Mike has covered the 8” floppy drive information. I have attached the 1983 3M Diskette Reference Manual. Required Primer for newcomers to 1970s and 1980s Computer Media for Floppy Drives. Greg

Corvus Service Manual http://bitsavers.trailing-edge.com/pdf/corvus/service/7100-04703_B-Drive_6MB_Service_Jun83.pdf Corvus made hard drive interface cards for numerous computers, including S-100 systems. Yes, IMI was the hard drive manufacturer, that Corvus used. They later bought out IMI...

I installed IBM AT, model 5170 (w/o hard drive) as a SCO Xenix or IBM Xenix server in 1985/1986. Back then, I worked with CSC Minneapolis (before Seagate bought out their Hard Drive division) to acquire one of their 40 MB hard drives (~ $1000 I think) and used Type 15 to “enter in” the heads and...

MTM Scientific (Clinton, Michigan) , Michael Mruzek president will have additional IBM PC 5150 (5-slot) Retro Kits, as well as bare motherboards (V3, 256K), available for ordering by April 2022. Useful upgrade path for an Early version or Dead IBM PC 5150 motherboards...

I am looking for clear photos of the HP 13270-60003 cable and terminations (card edge connector & hood). The HP 13270-60003 cable (1.2m) was used to connect HP 264x terminals to its 5.25” floppy drive (HP 13272A Flexible Disk System). The Cable’s Connector is a 40-pin Card Edge Connector, like...