> From: Chris Zach
> Might have an older MXV11 as well, could the 18 bit one do this
Ooh, good catch; yes, the MXV11-A also has an LTC. I too have an 'extra' one.
The OP should probably check to see if his P/S generates the bus clock signal;
most of the options we've discussed for him
On 10/3/20 4:07 PM, Fred Cisin via cctalk wrote:
On Sat, 3 Oct 2020, Will Senn via cctalk wrote:
2. Most of the Assembly examples use DOS interrupt 21 for output. Is
this typical of assembly programs of the time, or did folks use other
methods?
For simple stuff, Int21H works and is portable
You can find bootable disk images on-line that self extract to a floppy. For
DOS 3.31 I use a Compaq version that went with my DeskPro/386.
I would only emphasize that 3.5” support didn’t exist before DOS 3 (I forget if
it was 3 or 3.1; it was when the PS/2 came out). So you have to watch the
https://vintagecomputer.net/browse_thread.cfm?id=60
If you can find a way to format a MS DOS compatible diskette in the format
you need, here is how to get DOS 1 or DOS 3.3 onto that disk and make it
bootable.
Bill
I didn't think of looking at source. I'll dig around thanks for the tip.
Will
On 10/3/20 12:14 PM, Richard Cini via cctalk wrote:
Regarding #4, if you look at the releases source code for DOS 2.0 you will see
compilation switches for PCD and MSD. I would need to look again but some were
On 10/3/20 11:44 AM, Chuck Guzis via cctalk wrote:
On 10/3/20 8:38 AM, Will Senn via cctalk wrote:
Some questions I have related to the exploration:
1. I'm curious if there are other folks out there doing similar stuff?
2. Most of the Assembly examples use DOS interrupt 21 for output. Is
this
Richard,
I'll look for the Compaq 3.31 3.5" image. Thanks!
Will
On 10/4/20 10:02 AM, Richard Cini wrote:
You can find bootable disk images on-line that self extract to a
floppy. For DOS 3.31 I use a Compaq version that went with my
DeskPro/386.
I would only emphasize that 3.5” support
On 10/4/20 8:12 PM, jim stephens via cctalk wrote:
>
>
> On 10/4/2020 4:00 PM, Chuck Guzis via cctalk wrote:
>> On 10/4/20 1:50 PM, J. David Bryan via cctalk wrote:
>>>
>> I don't believe that you're missing anything. When I process these
>> files, I mask off the lower 24 bits as the block
On 10/4/20 8:58 PM, jim stephens via cctalk wrote:
> I had not seen your earlier no tape gap mentions.
The old CDC 6000 SCOPE 1LT driver. Since SCOPE user programs use
circular buffering, The PP overlay 1LT simply emptied the CM buffer and
wrote it, 12-bit word by 12-bit word to the drive
On 10/4/20 12:16 PM, Fred Cisin via cctalk wrote:
>>> On SOME systems, you could substitute
>>> DRIVPARM = /D:1 /F:2 for similar effect.
>
> On Sun, 4 Oct 2020, Chuck Guzis via cctalk wrote:
>> IIRC, in xDOS 3.2 and 3.3 DRIVPARM produced an error if specified as
>> usual, but when DRIVPARM was
Last year I found a box of material, much of it related to S-100
computers and the Sol I owned in the 1970s. I've scanned it in and
posted it to the Internet Archive:
https://archive.org/details/@j_peterson
Folks researching obscure old devices (Biotech Electronics CGS-808,
anyone?) may
On 2020-Oct-04, at 1:14 PM, Chris Hanson via cctalk wrote:
> Thanks to everyone who replied, on- and off-list! There’s an MXV11-B (M7195)
> on its way to me. :)
>
> Since people were asking about my setup, here’s what I have:
>
> - MDB BA11-clone enclosure, PSU, and 8-slot 22-bit backplane
>
On Oct 4, 2020, at 1:53 PM, Brent Hilpert wrote:
>
>> For the latter two, I need to figure out whether my backplane supports ABCD
>> use in the first couple of slots, or if it’s purely an ABAB model. (The
>> KDF11-A, RLV12, and MLSI-SCM11 came in the backplane, but I’m hesitant to
>>
On Friday, October 2, 2020 at 13:51, Al Kossow via cctech wrote:
> Those would already be broken with Bob's use of large negative numbers
> for physical end of tape and 'bad block is here' (you don't get to know
> how big that bad block was, so that is hell with tapes with
> variable-length
Greetings everyone, it's Been a while since i posted here.
I had picked up some modcomp minicomputers over the past couple years. A
modcomp classic, with a nice front panel with binary swiches, similar to a
pdp 11. There is a modcomp 32 as well, the machine boots from internal
floppy drives.
I
Hi Chen,
I just tried the tape drive and sadly it too has the capacitor leakage
problem like the CDROM drive.
So sorry but I cannot help reading your tapes.
Regards
Tom Hunter
On Fri, Oct 2, 2020 at 2:05 PM Chenshyh Tsay via cctalk <
cctalk@classiccmp.org> wrote:
> Dear Tom,
>
> Does your Sun
I'm surprised that they have not turned up since they are useful for wells when
trying to enhance output.
seismic data recovery from tape has been going on for a long time
On 10/4/2020 8:47 PM, Chuck Guzis via cctalk wrote:
On 10/4/20 8:12 PM, jim stephens via cctalk wrote:
On 10/4/2020 4:00 PM, Chuck Guzis via cctalk wrote:
On 10/4/20 1:50 PM, J. David Bryan via cctalk wrote:
I don't believe that you're missing anything. When I process these
files, I
I may be able to help. I have had mixed success reading QIC tapes.
I have encountered two problems reading them.
1. Band failure. There is a band inside the cartridge that keeps the
tape taut when drive advances and rewinds the tape. These bands like to
fail. I have found replacements that
On 10/4/2020 4:00 PM, Chuck Guzis via cctalk wrote:
On 10/4/20 1:50 PM, J. David Bryan via cctalk wrote:
I don't believe that you're missing anything. When I process these
files, I mask off the lower 24 bits as the block length. A 16MB tape
block is impossibly large in any case.
On 2020-Oct-04, at 1:22 AM, Josh Dersch via cctalk wrote:
> More mysteries while poking at the MDP-1000. Spent some time this evening
> working out the rest of the signals on the power harness (I suspect inputs
> for an LTC circuit and a "power good" signal, as well as something
> connected to a
I am helping a friend with his IBM 3279 terminal. I got the PSU working
after reverse engineering it. Concluded that the SMPS control chip was a
standard TDA 2640 in IBM disguise.
But of course the thing didn't work with the PSU fixed. A fuse which was in
series with the vertical deflection coil
On Sun, Oct 4, 2020 at 10:26 AM Brent Hilpert via cctalk <
cctalk@classiccmp.org> wrote:
> On 2020-Oct-04, at 1:22 AM, Josh Dersch via cctalk wrote:
>
> > More mysteries while poking at the MDP-1000. Spent some time this
> evening
> > working out the rest of the signals on the power harness (I
On 10/4/20 10:54 AM, Fred Cisin via cctalk wrote:
> On SOME systems, you could substitute
> DRIVPARM = /D:1 /F:2 for similar effect.
> Same switches as DRIVER.SYS.
> EXCEPT, DRIVPARM would alter the parameters for existing drive letter,
> NOT create a new drive letter. See also, LASTDRIVE
>
> MS-DOS 5.00 first version sold RETAIL
On Sun, 4 Oct 2020, Ali wrote:
Fred,I have to respectfully disagree here. 3.20 was sold in retail. It
was packaged in the dark blue packaging which was the norm for MS at
that time (after the green packaging of earlier products).?? I have a
copy
On 10/4/20 1:50 PM, J. David Bryan via cctalk wrote:
> On Friday, October 2, 2020 at 13:51, Al Kossow via cctech wrote:
>
>> Those would already be broken with Bob's use of large negative numbers
>> for physical end of tape and 'bad block is here' (you don't get to know
>> how big that bad block
On 2020-Oct-04, at 1:55 PM, Chris Hanson wrote:
> On Oct 4, 2020, at 1:53 PM, Brent Hilpert wrote:
>>
>>> For the latter two, I need to figure out whether my backplane supports ABCD
>>> use in the first couple of slots, or if it’s purely an ABAB model. (The
>>> KDF11-A, RLV12, and MLSI-SCM11
Sent from my iPhone
> On Oct 4, 2020, at 1:07 PM, Fred Cisin via cctalk
> wrote:
>
>> On Sun, 4 Oct 2020, Will Senn wrote:
>> I am using a Thinkpad T430 w/DOS 6.22. If I can figure out how to get 3.31
>> on there, I'll give it a shot. I bought a Floppy-USB connector for my old
>> 1.44
Thanks to everyone who replied, on- and off-list! There’s an MXV11-B (M7195) on
its way to me. :)
Since people were asking about my setup, here’s what I have:
- MDB BA11-clone enclosure, PSU, and 8-slot 22-bit backplane
- DEC KDF11-A (M8186) rev C processor with FPP added
- DEC DLV11-J (M8043)
On Sun, 4 Oct 2020, Richard Cini wrote:
I would only emphasize that 3.5? support didn?t exist before DOS 3 (I
forget if it was 3 or 3.1; it was when the PS/2 came out). So you have
to watch the image sizes.
PS/2 came out with PC-DOS 3.30 But also an IBM push for OS/2
DOS versions
>MS-DOS 5.00first version sold RETAILFred,I have to respectfully disagree
>here. 3.20 was sold in retail. It was packaged in the dark blue packaging
>which was the norm for MS at that time (after the green packaging of earlier
>products). I have a copy sitting up on my shelf (in fact I
On Sun, 4 Oct 2020, Will Senn wrote:
I am using a Thinkpad T430 w/DOS 6.22. If I can figure out how to get 3.31 on
there, I'll give it a shot. I bought a Floppy-USB connector for my old 1.44
floppy drive and it works fine with DOS 6.22, but I'm not sure where to
locate 3.31 media that I could
On SOME systems, you could substitute
DRIVPARM = /D:1 /F:2 for similar effect.
On Sun, 4 Oct 2020, Chuck Guzis via cctalk wrote:
IIRC, in xDOS 3.2 and 3.3 DRIVPARM produced an error if specified as
usual, but when DRIVPARM was suffixed by a string of three contorl-A
(hex 01h) characters, it
When 5150, 5160, and 5170 first came out, 3.5" drives did not yet exist.
OEMs that were early adopters of them used MS-DOS 2.11. The disk format
was not always the same as what IBM used starting with DOS 3.20.
For example, GAVILAN MS-DOS 2.11 supported 720K 3.5", but with a different
format
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