| Sysop: | Amessyroom |
|---|---|
| Location: | Fayetteville, NC |
| Users: | 23 |
| Nodes: | 6 (0 / 6) |
| Uptime: | 49:48:12 |
| Calls: | 583 |
| Files: | 1,138 |
| Messages: | 111,303 |
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.
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.
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.
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.
Is this the same John D. Baker of Applicard fame? I built the high speed serial daughter card for the Applicard, originally based on schematics and data from an old website you had. I did a how-to blog on it a few years back.
Best CP/M card ever made! https://planemo.org/2012/07/29/high-speed-serial-port-for-the-apple-ii-pcpi-applicard/
On Fri, 25 Jul 2025, ECNeilson wrote:
Is this the same John D. Baker of Applicard fame? I built the high speed
serial daughter card for the Applicard, originally based on schematics and >> data from an old website you had. I did a how-to blog on it a few years back.
Best CP/M card ever made!
https://planemo.org/2012/07/29/high-speed-serial-port-for-the-apple-ii-pcpi-applicard/
After looking at the above link, yes, that's me! When I finished school
back in 1996, I lost access to Usenet newsgroups (or it was ridiculouly cumbersome to even _start_ a newsreader). I was looking around and found
out about "eternal-september.org" and that's one account I didn't mind setting up.
Still have all the gear--it's just blocked by all manner of other stuff
so I can't actually get to it to operate any of it. I was recently disassembling the copies of ZMP I customized for the Davidge DSB 4/6 as
the one for the designated modem port _didn't_ use interrupt-driven
receive while the ones for the nominal printer port and aux port _did_,
but my "ZMP Install Disk" didn't have their sources--only the earlier polled-I/O versions. The interrupt-driven ones must be on 8-inch
floppies, but I don't have room to set up any of the 8-inch drives.
Likewise, my QTerm disk for the Davidge must be 8-inch as I only have
the final executables on the hard disk and the one for the modem port
doesn't do interrupt-driven receive while the ones for the printer and
aux port do.
There's only one public-facing web server I have access to, but I
never put any of my older stuff up there before. I've been working
on fixing it up and hope to get it there soon-ish.
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.
Sorry I can't help you on your DSB-4/6 project.-a I am such a fanboy of your and Steve Hirsch's work on the PCPI Applicard.-a I have all of your published
documents, and have CP/M and NZCOM booting on my CF3000 flash drive on my Apple //e.