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  1. Stack Machine CPU IC, What's Available? If Anything....

    Hi, Lately I have been toying with the idea of building a stack machine computer. This would require a CPU that has more than the rudimentary stack operations of Push, Pop, etc. My research has led...
  2. Thank You Al for posting those links! Extremely...

    Thank You Al for posting those links! Extremely useful. If you are reading this and have any present/future interest in running UCSD P-System on an IBM 5150 I definitely suggest grabbing both items...
  3. I have discovered a few tricks working with...

    I have discovered a few tricks working with various UCSD disk images. Some images have an extension ".IMD". I have found that these images can be converted to a binary format by using a program in...
  4. Those manuals are absolutely amazing! Definitely...

    Those manuals are absolutely amazing! Definitely will get me going while I continue the search for the IBM. Thank you so much. Michael
  5. WANTED: IBM Manual for UCSD P-System / Pascal

    Hello, I have searched extensively for a copy of the IBM manual(s) for the UCSD P-System. (This was an alternative operating system to DOS and CP/M for the original 5150 PC). Does anyone have a copy,...
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    I apologize for resurrecting this old thread, but...

    I apologize for resurrecting this old thread, but the original post is short, and the problem was not resolved. The OP could not test his 8087 FPU using some simple instructions compiled using debug....
  7. I burned a ROM and ran the diagnostic code in a...

    I burned a ROM and ran the diagnostic code in a stock IBM 5150 PC. Attached is a photo of the output that is displayed on the screen. Thank you for making this project available to the forum! ...
  8. Here is a screenshot of Ruud's Diagnostic ROM...

    Here is a screenshot of Ruud's Diagnostic ROM working on 5150 PC hardware. This is a stock motherboard with MDA display adapter. I doubled the file using a Hex Editor to 16K, and burnt it to a 27128...
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    Hi, I just wanted to do a quick followup on this...

    Hi, I just wanted to do a quick followup on this thread, in case anyone finds it in the future doing a search. Despite repeated efforts to address the shared memory in the 16bit 3C503 network card I...
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    Hi, The PC-Retro was first offered in 2012 by...

    Hi,

    The PC-Retro was first offered in 2012 by MTM Scientific, Inc after a long period of development with the valuable help of many regular contributors on this forum. Since the initial offering...
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    Shared Memory Location: 3C503 Network Card

    Hi, I have a 3C503-16-TP ISA Network Card (Etherlink II/16TP) and I am trying to find and use the shared memory space on the card in a 5150 PC. The card has a 16K boot ROM socket with selectable...
  12. Thank you everyone for your help and comments. I...

    Thank you everyone for your help and comments. I did another FTP upload to fix the truncated file. The manual on WinworldPC looks like a winner for understanding how to pull the legacy data off this...
  13. DUBLDISK Software: Pulled off IBM 5161 Expansion Unit

    Hi, I recently purchase an IBM 5161 Expansion Unit, XT Computer, and Cable. To my great surprise the system has booted with relative ease, except for a blown capacitor on the CGA card. I've booted...
  14. Hi, Thank you everyone for you comments and...

    Hi, Thank you everyone for you comments and input. I have created a webpage to describe the MIOS project. It is available here:

    http://www.mtmscientific.com/mios.html
  15. RTC Clock Card, Incomplete Port Addressing?

    Hi, I have a 8 bit ISA clock card manufactured by HYPER MICRO, called the HYPER CLOCK. This card caught my eye for the simplicity of layout. The support circuitry for the MM58167 RTC chip appears to...
  16. IBM PC BIOS ROM Replacement: Segment Organization

    Hi, I have been working on a chunk of 8K code to replace the BIOS ROM in an IBM 5150 PC. I'm writing and compiling using MASM 2.0 So far, I have the computer booting with a welcome message on the...
  17. Edison System by Per Brinch Hansen for IBM PC

    Hello, I am reading a book written by Per Brinch Hansen from 1982 which describes the Edison System for the PDP 11 and the IBM Personal Computer. In the back of the book there is an order form for...
  18. Thank you for posting the photos. Always...

    Thank you for posting the photos. Always interesting! What was in the bottle with the green cap in the second and third photos?
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    Hi! I regret that I have not had time to make any...

    Hi! I regret that I have not had time to make any updates on this project. The posted version is the most recent. PATB is really an interesting part of the early years of computer history. I posted a...
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    Found this shareware program quite by accident a...

    Found this shareware program quite by accident a few weeks ago... "DAQARTA for DOS". Turns your PC, XT, etc into a digital oscilloscope, spectrum analyzer, data recorder using a Keithley DAS-16 card,...
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    Regards the IBM XT/370 there is a really good...

    Regards the IBM XT/370 there is a really good special issue of BYTE magazine from 1984 that discusses the IBM machines, and there is some specific information about the special cards in your machine....
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    Hi, I just tried pulling RMD7 low with a soldered...

    Hi, I just tried pulling RMD7 low with a soldered 10K resistor to ground on two different Sergey VGA cards that work OK in 16 bit bit systems. Neither card worked on a 5150 motherboard running the...
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    I made the jump to Linux using Zorin. The distro...

    I made the jump to Linux using Zorin. The distro has a user interface very similar to Windows, with a terminal window that I can use to do some easy command line activities like compiling C code,...
  24. Hi, This is kind of a crazy question but here...

    Hi, This is kind of a crazy question but here goes. I have pulled the IBM Bios ROM out of my 5150 PC and replaced it with a ROM containing my own code. The ROM code initializes the MDA card registers...
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    Hi, Last week I just happened to stumble across a...

    Hi, Last week I just happened to stumble across a website with complete PDF scans of Volumes 1 through 13 of Dr. Dobb's Journal. These journals are absolutely terrific for information about the early...
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