View Profile: shirsch - Vintage Computer Forum

Yesterday, 06:54 AM

shirsch replied to a thread IBM 5150 Parity Error in PCs and Clones

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...

12 replies | 160 view(s)

February 24th, 2021, 02:31 PM

shirsch replied to a thread IBM 5150 Parity Error in PCs and Clones

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...

12 replies | 160 view(s)

February 24th, 2021, 11:54 AM

shirsch replied to a thread IBM 5150 Parity Error in PCs and Clones

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...

12 replies | 160 view(s)

February 24th, 2021, 07:04 AM

shirsch replied to a thread IBM 5150 Parity Error in PCs and Clones

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...

12 replies | 160 view(s)

February 24th, 2021, 06:33 AM

shirsch replied to a thread IBM 5150 Parity Error in PCs and Clones

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...

12 replies | 160 view(s)

February 23rd, 2021, 05:09 PM

shirsch started a thread IBM 5150 Parity Error in PCs and Clones

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'. ...

12 replies | 160 view(s)

February 22nd, 2021, 09:23 AM

shirsch replied to a thread Lisa 2/10 floppy and hard drive replacements? in Later Apple (68000+ based machines - Mac, Lisa, etc.)

It depends on what software environment you plan to use. Lisa Office System will not work with any SCSI solution - ProFile or equivalent is...

23 replies | 272 view(s)

February 22nd, 2021, 07:15 AM

shirsch replied to a thread Lisa 2/10 floppy and hard drive replacements? in Later Apple (68000+ based machines - Mac, Lisa, etc.)

Floppy Emu works fine on Lisa: https://www.bigmessowires.com

23 replies | 272 view(s)

February 17th, 2021, 04:58 AM

shirsch replied to a thread For Sale: spotted on Craigslist (continuous sightings) in Vintage Computer Items For Sale or Trade

Is this a rebadged Canon Cat?

2346 replies | 460961 view(s)

February 16th, 2021, 02:01 PM

shirsch replied to a thread Corvus Concept owners? in Other

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...

9 replies | 347 view(s)

February 14th, 2021, 12:49 PM

shirsch replied to a thread Corvus Concept owners? in Other

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. ...

9 replies | 347 view(s)

February 7th, 2021, 01:06 PM

shirsch replied to a thread Ampro Little Board Plus and SmartWatch in CP/M and MP/M

Any possibility the battery may have gone flat?

2 replies | 147 view(s)

February 5th, 2021, 11:04 AM

shirsch replied to a thread ZCPR3 for Montezuma CP/M on TRS-80 M4 in CP/M and MP/M

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...

8 replies | 260 view(s)

February 5th, 2021, 09:26 AM

shirsch replied to a thread ZCPR3 for Montezuma CP/M on TRS-80 M4 in CP/M and MP/M

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...

8 replies | 260 view(s)

February 5th, 2021, 06:48 AM

shirsch replied to a thread ZCPR3 for Montezuma CP/M on TRS-80 M4 in CP/M and MP/M

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...

8 replies | 260 view(s)

February 3rd, 2021, 03:35 PM

shirsch replied to a thread RTS80 Model IV disk problems in Tandy/Radio Shack

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,...

8 replies | 300 view(s)

February 3rd, 2021, 03:31 PM

shirsch replied to a thread ZCPR3 for Montezuma CP/M on TRS-80 M4 in CP/M and MP/M

You should be able to use NZCOM (auto-installing Z-System) on a TRS-80. Download from here: http://www.gaby.de/edownf.htm

8 replies | 260 view(s)

February 2nd, 2021, 11:04 AM

shirsch replied to a thread RTS80 Model IV disk problems in Tandy/Radio Shack

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...

8 replies | 300 view(s)

February 2nd, 2021, 07:05 AM

shirsch replied to a thread RTS80 Model IV disk problems in Tandy/Radio Shack

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...

8 replies | 300 view(s)

January 30th, 2021, 04:05 PM

shirsch replied to a thread Northstar Advantage - Need some guidance in General Vintage Computer Discussions

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....

12 replies | 323 view(s)

January 29th, 2021, 07:03 AM

shirsch replied to a thread Corvus Concept owners? in Other

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....

9 replies | 347 view(s)

January 29th, 2021, 06:56 AM

shirsch replied to a thread Corvus Concept owners? in Other

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...

9 replies | 347 view(s)

January 28th, 2021, 07:28 AM

shirsch replied to a thread Kaypro 10 & CoPower 88 in CP/M and MP/M

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...

31 replies | 1551 view(s)

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