Included tags: IBM PC ×
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IBM PC, PCXT, Tandy 1000 • Floppy B Problem

MISTerFPGA about 8 days ago

Using the PCXT it doesn't matter what I select as an .img for Floppy B the emulation behaves as if it's the identical disk as drive A.core is PCXT_20230902.rbf …

IBM PC, PCXT, Tandy 1000 • IBM PC-DOS Weirdness

MISTerFPGA about 2 months ago

Hey all. IBM does something unexpected when formatting a drive from DOS 2.00. There's a whole bunch of bytes written just before the second copy of the FAT at hex offset 0x1000 from the partition start. I see no recognizable strings in there, it doesn't l …

How long did CP/M have a hold before MS-DOS became a thing

VCFed about 2 months ago

I've had it in my mind that each had its own "era" in a sequential thing like "CP/M was it for 8 years, and then MS-DOS was it for X years", but the early date of the IBM PC in 1981 seems to throw that idea out the window. Obvious …

PC XT 5160 Motherboard with patch wires

VCFed about 2 months ago

I have this 5160 motherboard that just blew a tantalum capacitor, and noticed a few things about it while working on it. 64-256KB Board p/n 6320155 Chips are mostly dated early/mid 1984 The tantalum capacitors are common 2-lead, not the more usual 3-lead …

IBM PC, PCXT, Tandy 1000 • DOS Versions Wanted

MISTerFPGA about 3 months ago

For the VHD generator I'm writing I'm looking to gather as many original MS/IBM DOS versions as I can. I know that MS-DOS was originally distributed through OEM's so this is quite a tall order (I now have 53 OEM-releases of 2.x alone). I'm looking for DOS …

IBM PC, PCXT, Tandy 1000 • MiSTer PC XT BIOS

MISTerFPGA about 3 months ago

Here's my small contribution to this project:MiSTer PC XT BIOSIt's a fork of well known 8088_bios (https://github.com/skisele... PC XT related enhancements:Memory size set to 704KB. So if A000h UMB enabled, 704KB memory will be available to …

IBM PC, PCXT, Tandy 1000 • XT-IDE r625

MISTerFPGA about 3 months ago

Just received much awaited addons and start looking at MisterXT Looks like it's suggested BIOSes goes with quite old XT-IDE release, so i made a build of main and XT-IDE BIOS.Main BIOS is a quick port of Book8088 (chinese XT laptop) BIOS i'm working on, w …
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Is this part from an IBM PC or XT?

VCFed about 3 months ago

Is this a card bracket, or something similar, maybe from a 5150 or 5160 PC? …

GaGe CompuScope Lite PC/XT Drivers/Software

VCFed about 3 months ago

I recently acquired a CompuScope Lite digitizer card from ~1992 with a PC Bus interface compatible with an IBM PC/XT. I'd like to test this card as it seems like a pretty interesting product to turn an XT with Hercules graphics into an oscilloscope, but I …

Getting back into older PC's with my first 486 Build in almost 30 years

VCFed about 3 months ago

So I have been on an 8bit kick for years now. I feel like we are so far removed from 8 bit computers they just seem more interesting to me now more than ever. I have plenty of IBM PC's but I still remember using them so I guess I just havent done much with …

IBM PC 5150 Monitor + BIOS ROM

VCFed about 4 months ago

@RichCini and I have collaborated on reconstructing the Monitor + BIOS ROM code that Microsoft used to transfer 86-DOS binaries to prototype IBM PCs in the early days of PC-compatible DOS. According to the notes written by Bob O'Rear (one of the core devs …

IBM PC, PCXT, Tandy 1000 • Addons needed to run XT core

MISTerFPGA about 4 months ago

Hi.I'm new to this kind of emulation, but attracted to idea to have a possibility to modify pretty much everything if needed.I've ordered a DE-10 Nano board already and would love to know which addons i need to run this core.Looks like SDRAM is certainly …

IBM PC/AT with EMEA

VCFed about 4 months ago

I'm trying to decipher this error message when running advanced diagnostics: REFRESH FAILURE 200002 0002 18:03:14 error - 12928KB MEMORY 203 What module on the EMEA could it be? …

IBM PC Cluster Adapter Networks

VCFed about 4 months ago

Does anyone here have any experience with these? I'm curious about the physical topology itself. …

IBM PC motherboard 64-256k Timer failure

VCFed about 4 months ago

Hi, I have a 64-256 pc-board with a timer error. I tested the board some years ago with the Landmark rom and now with Ruud's diag rom. Sadly I got the same result: Mostly are all timers faulty, sometimes only one or two. The interrupt is also faulty in the …
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Extra colors for hires graphics wanted ?

Apple Fritter about 4 months ago

As we all know, the Apple II can produce four colors in the HIRES mode, plus black and white (which are not "colors", but "shades". But what can I complain. Some computer folks are so uneducated that they pervert the meaning of words all the time. Such as …

Paid disk recovery services recommendations

VCFed about 4 months ago

Someone contacted the Vintage Computer Federation and they are not local and don't want to mail their floppy disks to us for recovery. I'm aware that there are some services that recover different media, but am looking for reputable companies that we can r …

Problems with the IBM PC AT (5170)

VCFed about 4 months ago

Hello everyone. Please help me repair the IBM PC AT (5170) motherboard. Problem description: The motherboard does not start and does not show the image on the monitor. Post code 21. Sometimes (rarely) the motherboard can start normally. This usually happ …

Solid State Solutions for IBM PC 5170

VCFed about 4 months ago

Hello Friends I've spent a good portion of today reading old threads on the XT-IDE being used in the 5162 or the 5170. Lot's of useful information there. The take away is that I'd have to use a non IBM BIOS in order to fully use the XT-IDE. If that isn …

86-DOS / QDOS version 0.1c disk image posted on archive.org!

VCFed about 4 months ago

This is until now the oldes known version of 86-DOS / QDOS, download here (Serial number 11!). But the image is 8 inch 250 kb so I don't think you get it to run on an IBM compatible PC. Other versions of 86-DOS: 0.34 klick klick 1.0 klick and extracted …

[yt] Video showing a deep dive into the earliest to date copy of 86-DOS 0.11.

VCFed about 5 months ago

This video gives an in-depth look at what is currently the oldest known copy of 86-DOS, the antecedent to #MSDOS aka #PCDOS, where we go through the process of moving from CP/M, translating Z80 to 8086 code, and assembling it. Since this DOS predates the I …

8-bit acorn hardware • 5.25 drives with Ready signal

Stardot about 5 months ago

Hi,I'm looking for a list of 5.25" 40 track drives that provide a Ready signal (that goes low when a disk is inserted and spinning). I have a YE Data YD 274 that does but I suspect it may be faulty so am looking for a substitute to try. One I had to hand …
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Need Tandy 1000HX ROM for PCEM v12 windows

VCFed about 5 months ago

Need Tandy 1000HX ROM for PCEM v12 windows. I followed the instructions below to install PCEM and emulate the Tandy 1000, but unable to find the 1000 HX rom for PCEM that works. Has anyone tried PCEM with a Tandy 1000 HX ROM? ... …

Two 5161 Expansion Units?

VCFed about 5 months ago

Hi, has anyone tried to connect two Expansion Units to an IBM PC? What would happen if you install two Extender Cards in the PC? Or cascade two Units, install the Extender Card into the first Expansion Unit. Thank you! …

[SHARP Interface software & IC card for IQ 7000, ZQ 6000, IQ 8000, ZQ 5000, ] [Offers]

VCFed about 5 months ago

Any one interested in , [3 Dimensional Spreadsheet] 64kb Application IC card and [Organizer Link II] PC Interface software Both complete in Box and Made in Japan And in very good condition. For Sharp Electronic Organizers Interface software states com …