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Back after almost 30 years?

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While recovering from shoulder surgery, I watched a lot of retro-computing
videos from YouTube (especially Usagi Electric) and it made me all
nostalgic for the kind of hacking I used to do.  So I dug my Davidge
DSB-4/6 (DSB-4000 rev. B) out and resumed GIDE hacking.

I now have it booting from the hard disk.  I've read the work Armin
Diehl did with a VHDL implementation of GIDE on his Prof80 ECB system
and liked it enough that I'm trying to transition my naive disk-handling
to his partitioning scheme.

I was hoping to read/write Davidge floppies w/22DISK and have disk
definitions for them, but 22DISK operates 3.5-inch floppies at 300kbps
in DD mode so it can't read a disk produced on the Davidge nor can the
Davidge read a disk written by 22DISK.  The closest I've come is to
image a Davidge disk w/IMD and re-write it using 250k->300k conversion.
Conversely, format a disk with 22DISK and my Davidge disk definition,
image it with IMD and re-write it using 300k->250k conversion.

I assembled what I consider a minimum viable system disk and imaged it
with IMD, but a copy written from that image has a bad sector in the
last sector (18) on track 0 (3.5/5.25, 18 128-byte SD sectors).  The
DD/MFM data area is intact, however.

-- 
|/"\ John D. Baker, KN5UKS               NetBSD     Darwin/MacOS X
|\ / jdbaker[snail]consolidated[flyspeck]net  OpenBSD            FreeBSD
| X  No HTML/proprietary data in email.   BSD just sits there and works!
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Back after almost 30 years? "John D. Baker" <jdbaker@spike.technoskunk.fur> - 2025-07-19 20:08 -0500
  Re: Back after almost 30 years? "John D. Baker" <jdbaker@consolidated.net> - 2025-07-19 20:49 -0500
  Re: Back after almost 30 years? ECNeilson <eric@neilsonhart.com> - 2025-07-25 15:01 -0500
    Re: Back after almost 30 years? "John D. Baker" <jdbaker@consolidated.net> - 2025-07-25 15:49 -0500
      Re: Back after almost 30 years? ECNeilson <eric@neilsonhart.com> - 2025-07-25 19:36 -0500
        Re: Back after almost 30 years? Steven Hirsch <snhirsch@gmail.com> - 2025-07-31 10:19 -0400
  Re: Back after almost 30 years? ECNeilson <eric@neilsonhart.com> - 2025-07-25 15:07 -0500
  Re: Back after almost 30 years? ECNeilson <eric@neilsonhart.com> - 2025-07-25 15:08 -0500
  Re: Back after almost 30 years? Steven Hirsch <snhirsch@gmail.com> - 2025-07-31 10:17 -0400

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