View Profile: shirsch - Vintage Computer Forum

Yesterday, 03:52 PM

shirsch replied to a thread Extron video scaler in Vintage Computer Hardware

I'm only familiar with a single model that expects RGB + H/V Sync input. The scalar is certainly able to control aspect ratio for that type of video...

11 replies | 107 view(s)

March 6th, 2021, 07:15 AM

shirsch replied to a thread Extron video scaler in Vintage Computer Hardware

It seems to work fine with my Apple //gs. That's 15.something kHz. It's possible that some aspect of the conversion (color trueness?) may suffer a...

11 replies | 107 view(s)

March 5th, 2021, 05:41 PM

shirsch replied to a thread Extron video scaler in Vintage Computer Hardware

Yes, the need to store specific low-level input settings is the exception, not the rule. The built-in memories probably cover 98% of the use cases. ...

11 replies | 107 view(s)

March 5th, 2021, 10:34 AM

shirsch replied to a thread Extron video scaler in Vintage Computer Hardware

I found it easier to tweak settings from the PC while watching the unobstructed display. But, more importantly, you cannot save a truly complete...

11 replies | 107 view(s)

March 5th, 2021, 07:47 AM

shirsch started a thread Extron video scaler in Vintage Computer Hardware

Just wanted to let folks know about these gadgets. I've recently scored a handful of Extron RGB-HDMI 300A scalers on eBay for around $30 each. When...

11 replies | 107 view(s)

March 4th, 2021, 12:55 PM

shirsch replied to a thread Corvus Concept owners? in Other

In case anyone wants to use an Extron (or other device with HD15 in) with a Concept, here is the cable wiring: DB9M HD15M 1...

10 replies | 464 view(s)

February 27th, 2021, 07:31 AM

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

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

13 replies | 260 view(s)

February 26th, 2021, 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...

13 replies | 260 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...

13 replies | 260 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...

13 replies | 260 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...

13 replies | 260 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...

13 replies | 260 view(s)