31 Mar
2019
31 Mar
'19
12:42 p.m.
Hey all,
I'm writing a blog post about this IBM 6360 disk controller I want to build:
https://www.andersknelson.com/blog/?p=601
I've read through the service manuals and other docs on Bitsavers but I
can't seem to find a deeper explanation on the protocol that runs over the
DB-37 cable.
I suppose I could bypass the controller inside the drive cabinet and
directly control the drives but I bet it'll be easier/better to use as much
of the electronics as possible.
Can anyone help with the protocol?
Thanks!
--
Anders Nelson
+1 (517) 775-6129
www.erogear.com
31 Mar
31 Mar
12:53 p.m.
Also I should note that I live in NYC, so if anyone around these parts has
a working Displaywriter I am willing to drive a bit and bring my portable
logic analyzer with me to capture traffic along the data connector.
=]
--
Anders Nelson
+1 (517) 775-6129
www.erogear.com
On Sun, Mar 31, 2019 at 3:42 PM Anders Nelson <anders.k.nelson at gmail.com>
wrote:
Hey all,
I'm writing a blog post about this IBM 6360 disk controller I want to
build:
https://www.andersknelson.com/blog/?p=601
I've read through the service manuals and other docs on Bitsavers but I
can't seem to find a deeper explanation on the protocol that runs over the
DB-37 cable.
I suppose I could bypass the controller inside the drive cabinet and
directly control the drives but I bet it'll be easier/better to use as much
of the electronics as possible.
Can anyone help with the protocol?
Thanks!
--
Anders Nelson
+1 (517) 775-6129
www.erogear.com
1:14 p.m.
On 3/31/19 12:42 PM, Anders Nelson via cctalk wrote:
I've read through the service manuals and other
docs on Bitsavers but I
can't seem to find a deeper explanation on the protocol that runs over the
DB-37 cable.
Have you looked at the displaywriter MAME driver?
The floppy uses an NEC 765 disk controller
3:03 p.m.
Hey Al,
I haven't looked at the MAME stuff but if it uses an NEC 765 then it
probably won't be the same. The signal list is quite a bit different, e.g.
only 5 non-contiguous address bits are used. Real weird.
I'll take a look all the same.
=]
On Sun, Mar 31, 2019, 4:30 PM Al Kossow via cctalk <cctalk at classiccmp.org
wrote:
On 3/31/19 12:42 PM, Anders Nelson via cctalk wrote:
I've read through the service manuals and
other docs on Bitsavers but I
can't seem to find a deeper explanation on the protocol that runs over
the
DB-37 cable.
Have you looked at the displaywriter MAME driver?
The floppy uses an NEC 765 disk controller
20 Apr
20 Apr
3:47 p.m.
Hi again,
Is there anyone within ~100 miles of the NYC area with a working IBM
Displaywriter? I haven't found any more info on the signaling that goes
over the DB37 data cable, and I would like to use my portable logic
analyzer to sniff out some basics:
- Boot
- File Read
- File Write
Any leads would be appreciated!
--
Anders Nelson
+1 (517) 775-6129
www.erogear.com
On Sun, Mar 31, 2019 at 6:03 PM Anders Nelson <anders.k.nelson at gmail.com>
wrote:
Hey Al,
I haven't looked at the MAME stuff but if it uses an NEC 765 then it
probably won't be the same. The signal list is quite a bit different, e.g.
only 5 non-contiguous address bits are used. Real weird.
I'll take a look all the same.
=]
On Sun, Mar 31, 2019, 4:30 PM Al Kossow via cctalk <cctalk at classiccmp.org
wrote:
>
>
> On 3/31/19 12:42 PM, Anders Nelson via cctalk wrote:
>
> > I've read through the service manuals and other docs on Bitsavers but I
> > can't seem to find a deeper explanation on the protocol that runs over
> the
> > DB-37 cable.
>
> Have you looked at the displaywriter MAME driver?
>
> The floppy uses an NEC 765 disk controller
>
>
>
>
21 Apr
21 Apr
9:08 a.m.
On 4/20/19 3:47 PM, Anders Nelson via cctalk wrote:
I haven't found any more info on the signaling
that goes
over the DB37 data cable, and I would like to use my portable logic
analyzer to sniff out some basics:
I could help you, I have several DWs and I want to document the hardware,
but thanks to kb vultures I've not been able to find a complete keyboard.
I have the PCB and cable but none of the mechanical parts.
I guess I could try hooking that up to try to get past POST.
7:15 p.m.
Cool, do you happen to have schematics for the keyboard or a description of
the signaling? I could help make a hardware convertor that takes in a USB
keyboard and spit out DW keystrokes...
A POST logic trace would be helpful I'm sure - where are you located? We
can take this off-list if you prefer.
=]
--
Anders Nelson
+1 (517) 775-6129
www.erogear.com
On Sun, Apr 21, 2019 at 12:24 PM Al Kossow via cctalk <cctalk at classiccmp.org>
wrote:
On 4/20/19 3:47 PM, Anders Nelson via cctalk wrote:
I haven't found any more info on the
signaling that goes
over the DB37 data cable, and I would like to use my portable logic
analyzer to sniff out some basics:
I could help you, I have several DWs and I want to document the hardware,
but thanks to kb vultures I've not been able to find a complete keyboard.
I have the PCB and cable but none of the mechanical parts.
I guess I could try hooking that up to try to get past POST.
7:24 p.m.
Looks like this guy has the Displaywriter keyboard protocol on his to-do
list:
http://www.kbdbabel.org/
--
Anders Nelson
+1 (517) 775-6129
www.erogear.com
On Sun, Apr 21, 2019 at 10:15 PM Anders Nelson <anders.k.nelson at gmail.com>
wrote:
Cool, do you happen to have schematics for the
keyboard or a description
of the signaling? I could help make a hardware convertor that takes in a
USB keyboard and spit out DW keystrokes...
A POST logic trace would be helpful I'm sure - where are you located? We
can take this off-list if you prefer.
=]
--
Anders Nelson
+1 (517) 775-6129
www.erogear.com
On Sun, Apr 21, 2019 at 12:24 PM Al Kossow via cctalk <
cctalk at classiccmp.org> wrote:
>
>
> On 4/20/19 3:47 PM, Anders Nelson via cctalk wrote:
> > I haven't found any more info on the signaling that goes
> > over the DB37 data cable, and I would like to use my portable logic
> > analyzer to sniff out some basics:
>
> I could help you, I have several DWs and I want to document the hardware,
> but thanks to kb vultures I've not been able to find a complete keyboard.
> I have the PCB and cable but none of the mechanical parts.
>
> I guess I could try hooking that up to try to get past POST.
>
>
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participants (2)
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aek＠bitsavers.org -
anders.k.nelson＠gmail.com