[torontocbm] Re: 1581 Support
- From: "Glenn Holmer" <dmarc-noreply@xxxxxxxxxxxxx> ("cenbe")
- To: torontocbm@xxxxxxxxxxxxx
- Date: Sat, 1 Jan 2022 13:04:04 -0600
On 12/31/21 19:11, Chiron Bramberger (chironbramberger) wrote:
It’s jiffy dos. It doesn’t know that it’s a 1581 because it’s running
jiffy dos on the drive. So the string it returns doesn’t match a
stock 1581.
How are you doing the drive detection (I haven't looked at the source)?
There's a great assembly routine by Todd Elliott on Steve Judd's
"fridge" site:
http://www.ffd2.com/fridge/io/Drivpoll.s
It's really efficient: look at the M-Rs at the end, he's just reading a
couple of bytes from just the right place in the ROMs, and I believe
this will return the same values for JiffyDOS and non-JiffyDOS ROMs. I
implemented it in PROMAL with support for a few modern devices here:
https://www.lyonlabs.org/commodore/onrequest/PROMAL/diskutil/diskutils.s
Since I have JD and non-JD 1581s, I just tested that code with JD and
stock 1581s and both were recognized as a 1581.
But if someone has a non-JiffyDOS 1581 it should work.
Yes, that first one I tried does work correctly on my stock 1581.
But thanks again for testing! I’d love to know what happens with no
jiffy dos. But if it’s a pain to swap rom chips I understand.
The new version "for-glen" (two n's please, thanks) works correctly on
both JD and non-JD 1581s.
--
Glenn Holmer (Linux registered user #16682)
"After the vintage season came the aftermath -- and Cenbe."null
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