4 Jul
2010
4 Jul
'10
11:39 p.m.
Does anyone have a working (hopefully, I know it's asking a lot) Apple
2C power supply? I can build one up if I weren't lazy, but I really
would just like to get it going with a regular supply. Also will try to
hook up and bootstrap over a copy of apple dos, assuming the ADT Pro
will bootstrap me.
The Apple 2e now has a super serial card waiting, so that project will
proceed when the paying work clears later this week. I will have to
find my serial kit and organize it a bit, but that will be a good exercise.
Again, I don't know looking over the thread if I asked, if anyone could
also spare or point at a cpm card for the 2e? I am a bit ahead of
myself in asking for that, but I do have a number of boxes of CP/M disks
in the pile with the ones I got with that system.
I wish I weren't working on paying work over the 4th, but you work when
those who pay want you to.
Jim
5 Jul
5 Jul
7:57 a.m.
On Mon, Jul 5, 2010 at 2:39 AM, jim s <jws at jwsss.com> wrote:
Again, I don't know looking over the thread if I
asked, if anyone could also
spare or point at a cpm card for the 2e? ?I am a bit ahead of myself in
asking for that, but I do have a number of boxes of CP/M disks in the pile
with the ones I got with that system.
It's been a long time since I used a CP/M card in an Apple (like not
since 1984). With the strangeness of Woz's disk controller design,
I'm guessing you need hardware-specific-formatted disks, but can
anyone confirm/refute that?
I wish I weren't working on paying work over the
4th, but you work when
those who pay want you to.
I hear you.
-ethan
9:03 a.m.
On Mon, 5 Jul 2010, Ethan Dicks wrote:
On Mon, Jul 5, 2010 at 2:39 AM, jim s <jws at
jwsss.com> wrote:
That's correct. The Apple CP/M format was physically the Woz GCR coding.
You can use DOS 3.3 or ProDOS utilities to make disk-to-disk copies.
At the logical level it looks like any other CP/M diskette.
Steve
--
Again, I don't know looking over the thread
if I asked, if anyone could also
spare or point at a cpm card for the 2e? ?I am a bit ahead of myself in
asking for that, but I do have a number of boxes of CP/M disks in the pile
with the ones I got with that system.
It's been a long time since I used a CP/M card in an Apple (like not
since 1984). With the strangeness of Woz's disk controller design,
I'm guessing you need hardware-specific-formatted disks, but can
anyone confirm/refute that? 
1:43 p.m.
On Mon, 5 Jul 2010, Ethan Dicks wrote:
It's been a long time since I used a CP/M card in
an Apple (like not
since 1984). With the strangeness of Woz's disk controller design,
I'm guessing you need hardware-specific-formatted disks, but can
anyone confirm/refute that?
That is correct. Apple CP/M has a unique GCR format. Same HARDWARE
issues as Apple-OS. When I did the upper level (file system) software
for "Apple Turnover", I did Apple OS, Apple CP/M, ProDos, and Apple Pascal
formats.
SVA (Sorrento Valley Associates) made an accessory disk controller for
Apple ]['s. I don't remember whether it supported MFM, or just FM, but it
did support 8"
--
Grumpy Ol' Fred cisin at xenosoft.com
2 p.m.
On Mon, 5 Jul 2010, Fred Cisin wrote:
On Mon, 5 Jul 2010, Ethan Dicks wrote:
As did Vista, Corvus, Taurus and a few others. It was interesting to see
the various approaches used to achieve reliable DD operation, since the
Apple CPU was not fast enough to poll status registers and manage transfer
at the requisite speed.
The SVA Megaplex was one of my favorites! Two nearly identical sofware
loops one page apart in memory. One moved a sector's worth of bytes and
the other was an infinite loop. The FDC RDY* signal caused A8 to toggle
when data was available for read or ready for write. IIRC, the board had
2k of SRAM for the firmware. ROM was a 256 byte PROM (unless I'm
confusing this with something else - it's been a while).
Steve
--
It's been a long time since I used a CP/M
card in an Apple (like not
since 1984). With the strangeness of Woz's disk controller design,
I'm guessing you need hardware-specific-formatted disks, but can
anyone confirm/refute that?
That is correct. Apple CP/M has a unique GCR format. Same HARDWARE
issues as Apple-OS. When I did the upper level (file system) software
for "Apple Turnover", I did Apple OS, Apple CP/M, ProDos, and Apple Pascal
formats.
SVA (Sorrento Valley Associates) made an accessory disk controller for
Apple ]['s. I don't remember whether it supported MFM, or just FM, but it
did support 8" 
6 Jul
6 Jul
11:32 a.m.
The SVA Megaplex was one of my favorites! Two nearly
identical sofware
loops one page apart in memory. One moved a sector's worth of bytes and
the other was an infinite loop. The FDC RDY* signal caused A8 to toggle
when data was available for read or ready for write. IIRC, the board had
2k of SRAM for the firmware. ROM was a 256 byte PROM (unless I'm
confusing this with something else - it's been a while).
Not a disk controller, and certainly not done for speed, but IIRC the
original Apple ][ parallel interface card did something similar. The
status line back from the printer went to an address input on the
firmware ROM<, and thus the code extecuted depended on whether the
printer was ready or not.
-tony
5 Jul
5 Jul
2:58 p.m.
On 5 Jul 2010 at 13:43, Fred Cisin wrote:
SVA (Sorrento Valley Associates) made an accessory
disk controller for
Apple ]['s. I don't remember whether it supported MFM, or just FM,
but it did support 8"
...and I'll mention that the Micro Solutions MatchPoint PC card would
allow one to format, read and write Apple II floppies on a PC (both
CP/M and Apple DOS). It came with a copy of Uniform for the CP/M
transfer.
--Chuck
6 Jul
6 Jul
11:29 a.m.
SVA (Sorrento Valley Associates) made an accessory
disk controller for
Apple ]['s. I don't remember whether it supported MFM, or just FM, but it
did support 8"
Many years ago I rememebr seeing a (commercial) add-on board for the
Apple ][ that contained a WD1771 and was linked to a pair of 8" drives
(standard Shugart interface from what I could tell). Of course that was
FM< (single density) only
I can;t rememerb who made it, my guess is there were several companines
making such boards.
-tony
5284
days inactive
5285
days old
7 comments
6 participants
participants (6)
-
ard＠p850ug1.demon.co.uk -
cclist＠sydex.com -
cisin＠xenosoft.com -
ethan.dicks＠gmail.com -
jws＠jwsss.com -
snhirsch＠gmail.com