23 Apr
2019
23 Apr
'19
3:23 a.m.
Hi all --
I'm working on a Televideo 925 terminal with a few problems, one of which
is a bad character generator ROM, (a MOS 2332). Does anyone have a dump of
this already, or have a working 925 they'd be able to dump the ROM from?
Thanks in advance,
Josh
23 Apr
23 Apr
7:43 a.m.
I should be able to do that for you if you don't find someone else with a
dumped room sooner.
Patrick Finnegan
On Tue, Apr 23, 2019, 03:23 Josh Dersch via cctalk <cctalk at classiccmp.org>
wrote:
Hi all --
I'm working on a Televideo 925 terminal with a few problems, one of which
is a bad character generator ROM, (a MOS 2332). Does anyone have a dump of
this already, or have a working 925 they'd be able to dump the ROM from?
Thanks in advance,
Josh
9:07 a.m.
what is the ROM written on?
b
On Tue, Apr 23, 2019 at 7:44 AM Patrick Finnegan via cctalk <
cctalk at classiccmp.org> wrote:
I should be able to do that for you if you don't
find someone else with a
dumped room sooner.
Patrick Finnegan
On Tue, Apr 23, 2019, 03:23 Josh Dersch via cctalk <cctalk at classiccmp.org>
wrote:
Hi all --
I'm working on a Televideo 925 terminal with a few problems, one of which
is a bad character generator ROM, (a MOS 2332). Does anyone have a dump
of
this already, or have a working 925 they'd be
able to dump the ROM from?
Thanks in advance,
Josh
11:42 a.m.
On 4/23/19 4:43 AM, Patrick Finnegan via cctalk wrote:
I should be able to do that for you if you don't
find someone else with a
dumped room sooner.
I was wondering what TS-8xx systems you have that supported RS-422,
and if you've dumped the firmware from them.
I can request the TS-806/20 in the collection and dump the firmware
and disk if that would be of help
https://www.computerhistory.org/collections/catalog/102747355
9:01 p.m.
On Tue, Apr 23, 2019, 11:42 Al Kossow via cctalk <cctalk at classiccmp.org>
wrote:
On 4/23/19 4:43 AM, Patrick Finnegan via cctalk wrote:
I have an 801, 802, 803, 816, and TPC-I. I think I still need to image the
ROM from the TPC and 802.
One thing I noticed is that the 803 ROM isn't the same as the later ROM
shipped with the 803H. The earlier rom tried to talk to a hard disk using
the code from the 802, at the wrong IO port. I ended up burning a copy of
the 803H ROM from Bitsavers, and then was able to get it working with a
hard disk interface.
It'd be nice to have a copy of the disk and ROM for reference. It seems
like the disks that TeleVideo used failed early and often, so it's probably
best to image that sooner rather than later, and hope that it still works.
An image from an 816 disk would be more useful, though, since I have the
rest of the 816.
Patrick Finnegan
I should be able to do that for you if you
don't find someone else with a
dumped room sooner.
I was wondering what TS-8xx systems you have that supported RS-422,
and if you've dumped the firmware from them.
I can request the TS-806/20 in the collection and dump the firmware
and disk if that would be of help
https://www.computerhistory.org/collections/catalog/102747355 
11:02 a.m.
On 04/23/2019 02:23 AM, Josh Dersch via cctalk wrote:
Hi all --
I'm working on a Televideo 925 terminal with a few problems, one of which
is a bad character generator ROM, (a MOS 2332). Does anyone have a dump of
this already, or have a working 925 they'd be able to dump the ROM from?
Is the ROM totally bad, or just losing a few bits here and
there? If the latter, you could probably read it out, figure
out how the rows, columns and characters are mapped, and fix it.
Jon
11:25 a.m.
On Tue, Apr 23, 2019 at 11:02 AM Jon Elson via cctalk <cctalk at classiccmp.org>
wrote:
Is the ROM totally bad, or just losing a few bits here
and
there? If the latter, you could probably read it out, figure
out how the rows, columns and characters are mapped, and fix it.
Considering that 925s are really common, and a replacement EPROM should be
easy to source and program, this sounds like an overly difficult approach
that will yield something different than what he wants.
Pat
12:38 p.m.
On Tue, Apr 23, 2019 at 8:25 AM Patrick Finnegan <pat at vax11.net> wrote:
On Tue, Apr 23, 2019 at 11:02 AM Jon Elson via cctalk
<
cctalk at classiccmp.org> wrote:
The thought had crossed my mind, but only as a last resort. I'm not
entirely sure what the internal fault is, but the end result is two rows of
every character have all bits stuck "on." I've verified that the ROM
addressing is correct and that there's nothing on the output side causing
this behavior. Patrick, thanks very much for offering to read the ROM!
- Josh
Is the ROM totally bad, or just losing a few bits
here and
there? If the latter, you could probably read it out, figure
out how the rows, columns and characters are mapped, and fix it.
Considering that 925s are really common, and a replacement EPROM should be
easy to source and program, this sounds like an overly difficult approach
that will yield something different than what he wants.
Pat
11:24 a.m.
it is the same one used in the 910 1800000-016A_A17_85AE.bin
On 4/23/19 12:23 AM, Josh Dersch via cctalk wrote:
Hi all --
I'm working on a Televideo 925 terminal with a few problems, one of which
is a bad character generator ROM, (a MOS 2332). Does anyone have a dump of
this already, or have a working 925 they'd be able to dump the ROM from?
Thanks in advance,
Josh
8:35 p.m.
Cool, thanks, Al! I'll give that a go.
On Tue, Apr 23, 2019 at 5:20 PM Al Kossow via cctalk <cctalk at classiccmp.org>
wrote:
it is the same one used in the 910
1800000-016A_A17_85AE.bin
On 4/23/19 12:23 AM, Josh Dersch via cctalk wrote:
Hi all --
I'm working on a Televideo 925 terminal with a few problems, one of which
is a bad character generator ROM, (a MOS 2332). Does anyone have a dump
of
this already, or have a working 925 they'd be
able to dump the ROM from?
Thanks in advance,
Josh
1988
days inactive
1989
days old
9 comments
5 participants
participants (5)
-
aek＠bitsavers.org -
billdegnan＠gmail.com -
derschjo＠gmail.com -
elson＠pico-systems.com -
pat＠vax11.net