Hi! If you system cannot read a PC formatted 720K floppy with FDCMON then
there is almost certainly a hardware problem of some kind. From your other
emails it sounds like you've inspected and reinspected the DiskIO but be
sure to examine the ECB backplane to make sure all the connections are well
soldered and no excess solder blobs. It is a good idea to reheat every
solder connection and wick away any excess solder. The same thing for the
SBC especially in the bus interface section.
If the DiskIO is not working it could be a problem in any of those three
boards since they all must work together. Do you have any other boards that
you can test to verify the system is working? I would try the IDE section
of the DiskIO and if that works it suggests the problem is restricted to the
FDC section of the DiskIO.
Do you have an oscilloscope or logic probe? We are going to need to start
measuring some signals to figure out what is happening.
Also, when you try to format a floppy disk using the DiskIO can you read any
information from it using IMD? That would be a good clue if anything at all
is being written to the drive or not and further fault isolate the problem.
Good luck! Thanks and have a nice day!
Andrew Lynch
-----Original Message-----
From: n8...@googlegroups.com [mailto:n8...@googlegroups.com] On Behalf Of
Cobock1
Sent: Saturday, July 03, 2010 5:07 PM
To: N8VEM
Subject: [N8VEM: 7363] Re: Floppy Troubleshooting
My FDC9229 cost me an arm and a leg off of ebay. LittleDiode sold it
to me in "new" condition. It is super clean and there are no
indications of it having ever been used let alone soldered/desoldered.
If it was used, then it was pulled from a socket. I sure hope it isn't
dead.
Writing an 720k MS-DOS disk on my pc and trying to read it on my N8VEM
has never worked for me. I can write a 720k dos disk, but the N8VEM
will not read it. If I format it on the N8VEM, then Windows will no
longer read it and will tell me to format it. So I assumed FDCMON was
doing enough of a format to at least corrupt the file system that was
already on it.
The oscillator on my SBC is soldered down, but the ones on my DiskIO
board are not. In fact, they are a little wobbly. I'll solder those
down.
How do I do I use IMD to analyze a disk? I've used it to read and
write images in the past for something, but I didn't know I could use
it to analyze a disk...
Chris B.
On Jul 3, 4:25 pm, "Andrew Lynch" <ly...@yahoo.com> wrote:
Hi! Are you sure you are actually formatting track and sectors? Try
using
a generic PC with 3.5" floppy drive to format a 3.5" floppy disk with
the
720K format
format a: /f:720 /u
then try reading and/or writing those sectors.
If that is not successful try formatting a disk with the DiskIO and then
use
IMD on your PC to analyze what is being put down on the floppy disk.
Erase
the floppy using IMD first so you know you are reading what if anything
the
DiskIO board is writing.
You can get IMD here:
http://classiccmp.org/dunfield/img/index.htm
Do you have an oscilloscope or logic probe? We need to find out what
signals are present and which ones are working.
It's a good idea to solder the TTL oscillators to the PCB rather than
use
sockets too.
Thanks and have a nice day!
Andrew Lynch
-----Original Message-----
From: n8...@googlegroups.com [mailto:n8...@googlegroups.com] On Behalf
Of
Cobock1
Sent: Saturday, July 03, 2010 2:06 PM
To: N8VEM
Subject: [N8VEM: 7354] Re: Floppy Troubleshooting
I re-seated every IC, re-soldered every solder point. Still no go.
FDCMON and floppy cbios are still no go. It still lets me format
disks
and tracks, but still gives me a 21 01 00 00 00 00 00 error when I
attempt to read or write a sector/disk. CP/M still hangs when
starting
if I try to start it using Dan's CBIOS w/ floppy enabled. With floppy
disabled and IDE enabled, it starts fine. I'm looking for an old IDE
hdd to test the IDE side. I'm pretty confident that I'll be able to
get that to work. I have no clue what to do with the floppy side
though. The only reason I built the board was for floppy support.
Does
anyone else have any suggestions?
Chris B.
On Jun 30, 3:38 pm, "Dan Werner" <dw...@dpcpipe.com> wrote:
I agree, it sounds like hardware. Perhaps another set of eyes
looking
at the board would help, would you mind doing a high resolution
(300dpi)
scan of both sides of your disk IO and either e-mailing or posting
them?
Dan
-----Original Message-----
From: n8...@googlegroups.com [mailto:n8...@googlegroups.com] On
Behalf
Of Cobock1
Sent: Wednesday, June 30, 2010 1:49 PM
To: N8VEM
Subject: [N8VEM: 7329] Re: falsefalse
I can get CP/M to boot fine if I build the cbios with floppy support
turned off and IDE support turned on, but with no IDE device
attached.
I guess this probably means that my problem is going to be with the
floppy side of the hardware, huh? I have also tried with floppy
support turned on but the floppy drive disconnected. Just in case.
But
no go. The drive works under windows, also. There has got to be
something wrong with the floppy side of the DiskIO hardware...
Chris B.
On Jun 30, 12:41 am, Cobock1 <boc...@gmail.com> wrote:
Alas. Still no go. Your improved cbios still works the same for
me.
Everything works, but as soon as I attempt to load CP/M with the
DiskIO attached, the floppy light comes on and the system hangs. I
wonder if CP/M will load if I disable floppy support, but keep IDE
enabled...
Chris B.
On Jun 29, 11:05 pm, Geoffrey Reed <tr...@gmail.com> wrote:
On 6/29/10 6:01 AM, "Dan Werner" <dw...@dpcpipe.com> wrote:
21 01 00 00 00 00 00 represents an error code, "Missing
Address
Mark". Either
the disk is not formatted, or you have a hardware problem.
I
would double
check all of the soldering on the Disk IO card as it is very,
very
sensitive.
(I know this from personal experience!!)
Dan
Isn't there a version of the data separator that does not work
properly on
the disk-IO board (I know there are T and non T suffix parts)
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