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Wow - thanks for that detailed breakdown! Sounds perfectly reasonable to me.

I was unable to find a diagnostic ROM for 5150. The only ones I saw were for XT (5160).

I've been through a pile of XT and PC motherboards in the past few days and all of them had one or more...

Nailed it. When all else has been ruled out whatever is left, however unlikely, must be the culprit. Even though the error code indicated a problem with bank 1, I took a chance and removed bank 0,...

More information: Since the '82 ROM version requires that all banks be populated, I decided to try older ROMs to see if I could get POST to pass on Bank 0 (16k). First, I verified that my 2364...

Ok, so this is getting interesting. The original reference I found for POST errors said this:

5150/4450 (PC-1) Failing Memory Module Bit/Bank Location: 16-64K planar
Code: xyzz 201 if x=0, then...

The sockets look fine - nice and shiny with no bent or broken wipers. Switch settings:

SW1: on on off off off off on on
SW2: on on on on on off off off

BIOS is 12/82 (latest). All four banks...

I'm going through a few PC and XT motherboards here. One of the 16K-64K PC boards is showing error code '0401 201' followed by 'Parity Error 1'. Occasionally it displays '0400 201'. I've replaced...

It depends on what software environment you plan to use. Lisa Office System will not work with any SCSI solution - ProFile or equivalent is necessary for that. If you only want to run MacOS then...

Floppy Emu works fine on Lisa:

https://www.bigmessowires.com

Is this a rebadged Canon Cat?

Here is the Concept in portrait mode using the Extron scan converter. Looks better than the OEM monitor, IMHO. I need to tie RGB together for a white foreground, but this is plenty usable.

After building the appropriate adapter, I'm able to get a stable display from the Concept by use of an Extron RGB-HDMI 300A scan converter. Unfortunately, it renders upside down on the screen! Talk...

Any possibility the battery may have gone flat?

You are always able to intermix raw disk images with HFE - even in the same directory. FF is smart enough to understand that a file extension of .hfe (case insensitive) contains parameters within...

Quick followup: I have been working with Montezuma Micro CP/M on my M4 for a day or so using a FlashFloppy (Gotek) as drive A:. Initially I used the disk definition that Larry Kraemer posted which...

I never found the startup latency to be objectionable, but perhaps MM CP/M is an outlier. I'll give it a try here. The nzblitz approach that fritzeflink documents sounds like a good workaround as...

According to the folks on #troubleshooting you shouldn't use lubricant on the carriage rails. I admit to using dry silicone lube on mine, however, and it's always worked well.

You should be able to use NZCOM (auto-installing Z-System) on a TRS-80. Download from here:

http://www.gaby.de/edownf.htm

Many of the OEM drives were built by a Tandy-owned company named Texas Peripherals. There are a lot of similarities to the Tandon drives and I'm told that TPI actually built Tandon branded drives...

I just went through diagnosis and repair of diskette issues on my non-GA M4. There are a couple of things to try: First, replace the power supply caps in the upper right of the floppy controller...

To save you some time / frustration, keep in mind that the Gotek floppy emulators do not work with Northstar machines. I worked a bit with Jeff (Mr. HxC) towards getting N* support, but there were...

Hmm. The last time I tried was with a scan converter and had no luck at all. But, in reviewing the hardware documentation I see they used a 35Khz. horizontal scan (vertical in portrait mode, as you...

Hi, Al. I do not recall ever seeing the service manual for that monitor. Would you mind double-checking and perhaps upload it? You are one of the only other collectors I've 'met' who has a...

I'm about ready to throw in the towel on efforts to get MS-DOS booting on the Copower88. Reverse engineering the PAL based daughterboard did enable me to get it working - for some definition of...

Here is the CP88 EPROM image. Both of mine are identical.