2 Jun
2006
2 Jun
'06
9:31 a.m.
Has anyone a copy of the ITT 3280 System service manual? I'm mostly
interested in the terminals sections, i.e. ITT 3285/3287.
The terminals may also be known as Courier C275 and C270.
Christian
5 Jun
5 Jun
1:31 p.m.
On Fri, 2 Jun 2006 11:31:20 +0200 (CEST), Christian Corti wrote:
Has anyone a copy of the ITT 3280 System service
manual? I'm mostly
interested in the terminals sections, i.e. ITT 3285/3287.
The terminals may also be known as Courier C275 and C270.
Christian
Sad - I have only the infos for ITT3030 at
http://oldcomputers.dyndns.org/public/pub/rechner/sel/itt3030/info.html
Mit freundlichen Gruessen
Fritz Chwolka
10:27 p.m.
On Fri, 2 Jun 2006 11:31:20 +0200 (CEST), Christian Corti wrote:
FWIW, I have an ITT 3210 display terminal engineering manual (including
schematics). This is a fairly dumb RS232 terminal (it does support cursor
positioning, but not much more) built from TTL and MOS shift registers as
the display memory
As ever I have no scanner, but I can look stuff up if anyone needs it.
-tony
Has anyone a copy of the ITT 3280 System service
manual? I'm mostly
interested in the terminals sections, i.e. ITT 3285/3287.
The terminals may also be known as Courier C275 and C270.
Christian
Sad - I have only the infos for ITT3030 at
http://oldcomputers.dyndns.org/public/pub/rechner/sel/itt3030/info.html
7 Jun
7 Jun
4:02 p.m.
On Mon, 5 Jun 2006, Tony Duell wrote:
> Sad - I have only the infos for ITT3030 at
> http://oldcomputers.dyndns.org/public/pub/rechner/sel/itt3030/info.html
That's an entire different beast ;-) I have several of these machines
(complete with hard disks, external drives etc.) and a "small amount" of
spare parts in several banana boxes.
BTW there's where I found other ITT stuff like 3287 boards and course
materials.
FWIW, I have an ITT 3210 display terminal engineering
manual (including
schematics). This is a fairly dumb RS232 terminal (it does support cursor
positioning, but not much more) built from TTL and MOS shift registers as
the display memory
Well, *this* one is too dumb for me... The bigger ones from the 328x
series were generally connected to a terminal controller (3282) which in
turn provided terminal lines to an IBM 360/370 host. These terminals are
based on the i8008 (and i8080 in later models), I have several boards from
those terminals, some of them contain ICs that I cannod identify (see the
thread for the AMI 1315-P-2 and Synertek 2650-P-01). The AMI part seems to
be a keyboard controller with keycode repeat etc. The Synertek part *may*
be a custom chip, it's definitely *not* a Signetics 2650 as the idiot chip
collectors would tell you. BTW I couldn't trace a ground line to this IC,
only -5V and +5V, eight data(?) lines coming from DS8833 transceivers and
other signals I haven't traced out yet.
The display board from these terminals still have MOS shift registers, and
an unknown (again!) IC from NatSemi called 1409.
I hope schematics would tell me what all these rare ICs are.
Christian
11:45 p.m.
Well, *this* one is too dumb for me... The bigger ones
from the 328x
series were generally connected to a terminal controller (3282) which in
turn provided terminal lines to an IBM 360/370 host. These terminals are
based on the i8008 (and i8080 in later models), I have several boards from
those terminals, some of them contain ICs that I cannod identify (see the
thread for the AMI 1315-P-2 and Synertek 2650-P-01). The AMI part seems to
I don;'t think the 3210 manual is going to be any use at all for this. I
am pretty sure the keyboard encoding is done by some TTL chips one the
back of the keyboard, I rememeber, almost 20 years ago (when the thing
was already anytique), adding the circuit shown in the manual (a few TTL
chips on a bit of stripboard) so the keyboard could send lower case
characters (as stamdard, the keyboard was upper case only, the unit would
correctly display upper and lower case. Go figure).
be a keyboard controller with keycode repeat etc. The
Synertek part *may*
be a custom chip, it's definitely *not* a Signetics 2650 as the idiot chip
collectors would tell you. BTW I couldn't trace a ground line to this IC,
only -5V and +5V, eight data(?) lines coming from DS8833 transceivers and
This makes me think of a PMOS chip, effecively running on -10V (below the
5V line, if you see what I mean). Could it be a ROM, used to re-map the
keyboard layout?
other signals I haven't traced out yet.
The display board from these terminals still have MOS shift registers, and
an unknown (again!) IC from NatSemi called 1409.
I hope schematics would tell me what all these rare ICs are.
FWIW, the 3210 manual suggests repair by board-swapping, but does contain
full scheamtics and theory-of-operation.
-tony
6783
days inactive
6788
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