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:unsure: Well, I guess a massive heart attack is a good enough excuse. I'm feeling lenient today. Just don't do it again. :) Yes, any of us can go at any time. If I get some kind of bad cancer diagnosis, I'll be fine. I'll be grateful for having lived a good and long life.

I did a reasonable comparison, not thorough. Some things that I spotted: Item #1. POST: Code for the 5161 expansion unit is there (although, in a different location). Item #2. POST: Supports BIOS expansion ROM's. Item #3. POST: Reads switch 5 of SW2 (i.e. supports 640 KB). Item #4. POST: Has...

As a side note: Based on pages x and 5-1 of the March 1986 edition of the 5155/5160 technical reference, I won't be surprised if a 11/22/85 dated BIOS for the IBM 5160 turns up one day.

Correct. Background: Read the last bullet point on the web page at [here], a page about the 08/16/82 release for the IBM 5160. Speculation: It could be that your 08/16/82 release for the 5150 is in the same boat: Was there was going to be a '08/16/82' public release for the 5150 and 5160, but...

I remember once investigating a TV remote control that was battery damaged. The battery-leakage affected traces looked okay, but a multimeter revealed one to be open-circuit. - A very good visual inspection. - Are there chips besides the 8088 in sockets, i.e. other chips that can also be...

Those 'technical bulletins' are also on my website in the 'AST bulletins' section at [here].

I added my comments to the dedicated thread that you created about this ROM.

The BIOS is in the last 8 KB of that. Very interesting. If it had been an EPROM, I would have dismissed it. But it is a masked ROM with IBM numbering. The contents are very close to the 10/27/82 dated BIOS (dated two months later than yours) for the IBM 5150. Could this be a case of a BIOS...

Thank you. I have also hosted it at [here], after performing OCR and page de-skewing on the PDF.

I have released a new version of Ruud's Diagnostic ROM. It is now at version 4.3 Available at minuszerodegrees.net Enhancement #1: If you do not have a MDA video card nor CGA video card, Rudd's Diagnostic ROM will look for 4 KB of RAM at address A0000 (640 KB), and if found, use that for...

Page 5 of the manual at [here]. I once had a rebadged NEC MultiSync. I would use the TEXT and TEXT COLOR switches when I had the monitor connected to an MDA card. During those times, I would turn on the TEXT switch, and then use the TEXT COLOR switch to choose green. The manual's description...

Sorry. I wasn't clear. The switch block that I wrote of is on the TexElec IDE to SD Adapter. Hopefully the following diagram assists.

There is some basic information about the 'TexElec IDE to SD Adapter' at [here]. Based on the lower warning there, my guess is the ROM on your Portable's hard drive controller is set to start at address C8000 (sometimes written as 'C800'), and that is conflicting with the (default) ROM address...

You could try cleaning the edge connectors as well. And try re-seating the socketed chips.

I see at the web page at [here], the distinction between a Baby Blue II, and a Baby Blue II CPU Plus. You have the latter.

My "0 ohms" should have been "about 0 ohms". Less than half an ohm is okay. For example, the DIP switches on two cards that I checked, showed 0.2 ohms. Switch 4 on SW3 is OFF for your configuration, and so it is important to verify via the multimeter that, when OFF, it measures significantly...

So, the 5155's motherboard switch settings are set to enable all motherboard RAM. No RAM cards. Without the Baby Blue II fitted, when the POST counts up the RAM at power-on time, you see the POST count up to 256 KB. When you add the Baby Blue II, the 5155 still only counts up to 256 KB. Please...

As an example, the IBM AT doesn't load default values. If there was faulty RAM in the CMOS/RTC chip, I would expect one of the following: 1. If the POST checks that RAM, you would see a code/message indicating something along the lines of 'bad CMOS RAM'. (Followed by the machine halting.) 2. An...

You have shortened 'XTIDE Universal BIOS' to 'XTIDE'. Most people will consider 'XTIDE' to be a card. It is a bit like shortening 'London Bridge' to 'London'. To help prevent confusion later, I suggest that you use the typical shortened form of 'XTIDE Universal BIOS', which is 'XUB'.

In case you are unaware, there is a 'Problems' web page at [here]. The relevant entries are: Symptom: The XTIDE Universal BIOS (XUB) displays the make-model of some CF cards but not others. Symptom: The XTIDE Universal BIOS (XUB) does not display the make-model of any CF card. Symptom: The XTIDE...