I know this is dated by I found this when searching for information on my IBM 2133-23c. I've been able to successfully upgrade the video memory for the CL-GD5424 on my IBM 2133-23c and 2155A-24C PS/1 computers. I soldered an additional chip in the available pads. @Epictronics1 on youtube has a video …

I got the back cover off. The area circled was stuck on the metal motherboard plate. The plastic part was so stuck it bent the metal. I slid a long ruler up to that point and used it to "pop" that stuck part that was stuck.

I've got experience taking apart the original Compaq Portable. I now have the "286" version and the back panel that provides access for removing the motherboard will not come off. I believe there is a point in the middle of the panel that screws into the motherboard. I've tried "forcing" it as much …

I have two video cards that I could have used to test the monitor. Right now I forget which one it would have been. I have a LASER Monochrome Graphics/Color Graphics Card. It only has one switch between MDA and CGA. The other card is a VEGA Video 7 EGA card I use for my 5154. That card has a lot …

Thank you so much for the quick responses. I was using a known good card but it supports multiple types of monitors and had the wrong settings. I assumed it was totally broken based on the physical condition as shown in the attached photos. I'm bummed it is physically damaged but it does work! Also …

I purchased an IBM 5153 CGA monitor online and it was damaged during shipping. I've attached a screenshot of what the screen looks like. Looking for anyone in the community to see the photo and immediatly know what got damaged so I can fix it.

This was really helpful information. Thank you so much!

Without getting into serious details I'm wondering if anyone has information on a MFM / Floppy disk combination card that is 16-bit ISA but will work on an 8-bit bus. I have the ability to load a BIOS on the Intel networking card I have installed in my 5150 PC. Googling found a forum post of someone …

I've read all about the issues with this drive. I managed to get one for a couple bucks and wanted to learn how it worked (and see if it actually worked). It spins up just fine (boy is it loud). I believed something was mechanically wrong with the stepper motor as I didn't hear the actuator move. I …

Well, I did some searching and found a cable on Amazon. "4.5 Feet DB 9 Pin Male to VGA 15 Pin Male Adapter Cable, RS232 to VGA Conversion Cable, YOUCHENG， for Computer,Printers, Scanners" https://www.amazon.com/dp/B08GYKSJZT It works! I just had to remove pin 9 from the adapter so it would fit in my …

I've tried looking for cables. I want to make sure I get the correct cable. Also, I'm fine making my own cable if I know the 9-Pin to 15-Pin pin translation.

I have an IBM Series No. 028-004, P/N 59G9977, PS/1 SVGA monitor. The monitor connector is 9-Pin like my MDA and CGA monitors. What cable do I use to connect it to my PS/1 workstation which has built-in VGA?

After some research the video card is a VEGA Video-7 Deluxe EGA. I got help with the switch settings from https://stason.org/TULARC/pc/graphics-cards/U-Z/VIDEO-SEVEN-EGA-VEGA-DELUXE.html. I kept Switches 5 and 6 for SW1 setting on the motherboard to ON so the video card ROM handles the dirty work. …

Thank you Horun. I found that PIN 1 (clock) had come disconnected when I obtained the PC. Keyboard works great!

UPDATE: I found that the VEGA Video-7 may not work anymore (more testing to come). What I did find was the switch block SW1 on the board is the same as the IBM 5150. (http://www.minuszerodegrees.net/5150/misc/5150_motherboard_switch_settings.htm) I changed SW5 and SW6 to off and used the monochrome …

I need help identifying this 8088 motherboard because it has a keyboard header that I need to properly wire-up. I also need to know what the switch settings are. I'll give details on this PC, which i think is OEM, if it helps with the board identification. The only identification I see on the board …

I went and pulled the trigger and bought an Am5x86-P75 AMD AM486DX5-133W16BHC. 169-pin chip with the voltage regulator to convert 5v to 3.45v. Plugged it in and worked perfectly. Crazy seeing 133mhz on this IBM PC. This thread has all the info you need for this chip https://www.vogons.org/viewtopic. …

I know the original post is coming up on 2 years but I just got an IBM 2155a-c24 with the same motherboard. The screenshots of this restore have been helpful. I have a question about the 486dx processor. How many pins does it have? My computer has an SX chip soldered to the board with that socket …