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But in a single-tasking environment, what I said earlier holds: Latch the counter and read it at your leisure. No interrupt disabling necessary. ...

There are different techniques presented for various goals and environments. If you're trying to do precise timing in a multitasking environment,...

Okay, and what address is your VGA card's ROM sitting at? It's probably C800 or C000, so maybe you should rejumper your flash card to a Dxxx range....

Sounds like a fun little project! Mike

I assume that jumper W3 on the ST01 is not installed.

Looks like I have something workable now. I was under the impression that this counter always ran at a fixed rate, but apparently BIOSs are known to...

Thank you for the info, I tried 2 different address and it still freeze at the same place.

How about posting closeup photo's of top left Pins and text on PCB, bottom left pins and text on PCB. And close up photo of the PADS 0, 1, 2, 3 with...

From your Photo #2 in the last post I see you added some red jumpers trying to get the signals to the correct place. Rather than doing that what we...

I use VGA 8bit card and nothing more cards.

bakemono, I suggest you read up on how to properly read the PIT: https://www.phatcode.net/res/246/files/pctim003.txt

Your pictures are not helpful because it's impossible to see what jumpers are on what pins due to the angle. XTs don't normally have RAM in high...

I'm interested.... sent PM

The MCE2VGA works well for its intended purpose, which is to connect to 4:3 VGA monitors and LCDs. It performs some rescaling, which may or may not...

I uploaded additional photo. I run diagnostic program (under XT) and looks like that card needs high memory area which is not present in xt?

They're hard enough to get these days. Used is fine.

3.5" DSDD to be accurate. Let me look around and see what I've got, if you don't mind used disks.

Can you do....36 disks? I'll save you having to format them all and just hope there's enough extras to fulfill what I need if that works for you.

If anyone is interested, I modified the extended ROM basic 4.1 to: Replace the underscore functionality with backspace. When you type backspace,...

Remember that the Ultra 5 has a quite poor IDE controller onboard. There are a number of devices that don’t play well with the CMD 646 chipset that...

On my 8296-D, out of the 2 PLA's, one was bad, and it was replaced by an EPROM on an adapter. Truly, Robert Bernardo Fresno Commodore User Group...

Yep, I mentioned the compromised nature of the LC II in the video. It’s not a fantastic machine, but I do indeed like the form factor. It’s also...

No everything south of lemon grove is mexico....

"Clock error" would usually implicate the COPS chip on the I/O board. That's a tough chip to replace (although not impossible), so my recommendations...

The original Macintosh LC with a 68020 didn't have a 68841/51, so it couldn't support virtual memory. The LC II with a 68030 did support virtual...