30 May
2004
30 May
'04
11:25 a.m.
My Lilith workstation keyboard seems to have taken an "electric"
beating, i.e. a 12 v to 5V short.
The wiring inside the machine was not the best......
It took out the 8035, a 74ls373 and, much worse, an unknown to me Exar
IC 22-908-03, datecode 1983
The first two are easy to replace, the Exar is much worse.
Anybody have a pinout, a datasheet or an idea just what it might be ?
Jos
30 May
30 May
3:28 p.m.
My Lilith workstation keyboard seems to have taken an "electric"
beating, i.e. a 12 v to 5V short.
The wiring inside the machine was not the best......
It took out the 8035, a 74ls373 and, much worse, an unknown to me Exar
IC 22-908-03, datecode 1983
How many pins does this have?
THis sounds a lot like one of the 2 semi-custom ICs used with a
Keytronics capacitive keyboard. I've seen 22-908-3B and 22-950-3B used in
the PERQ 2 series and elsewhere. They have 20 pins each. The former is
the (latching) sense amplifier between the 8 keyboard row lines and an 8
bit input on the microcontroller.
Some later Keytronics keyboards have a 40 pin chip that contains both the
sense amplifiers and the column drivers. The number for this eludes me at
the momnet.
You might be able to get a replacement for these from another Keytronics
keyboard (e.g. a PC one).
The first two are easy to replace, the Exar is much worse.
Anybody have a pinout, a datasheet or an idea just what it might be ?
I should be able to find pinouts for the PERQ keyboard ICs.
Incidentally, I assume there's an EPROM in the keyboard (The 8035 has no
internal ROM, the '373 sounds like an address latch). Did this survive?
Do you have an image of it?
-tony
8:46 p.m.
Tony Duell heeft op maandag, 31 mei 2004 om 02:28 (Europe/Zurich) het
volgende geschreven:
It is a 20 pin IC and it sits at the receiving end of the keyboard
matrix, the other side of the matrix is driven by two 74138.
It took out
the 8035, a 74ls373 and, much worse, an unknown to me Exar
IC 22-908-03, datecode 1983
How many pins does this have?
THis sounds a lot like one of the 2 semi-custom ICs used with a
Keytronics capacitive keyboard. I've seen 22-908-3B and 22-950-3B used
in
the PERQ 2 series and elsewhere. They have 20 pins each. The former is
the (latching) sense amplifier between the 8 keyboard row lines and an
8
bit input on the microcontroller.
It seems to be the exact same IC. The keyboard is indeed a Keytronics.
You might be able to get a replacement for these from another
Keytronics
keyboard (e.g. a PC one).
I'l start looking around..
I should be able to find pinouts for the PERQ keyboard ICs.
I was hoping to kludge
a replacement with some TTL's, but this might be
difficult with a capacitive coupled keyboard.
Incidentally, I assume there's an EPROM in the keyboard (The 8035 has
no
internal ROM, the '373 sounds like an address latch). Did this survive?
The '373 was indeed the addresslatch for the 8035. The eprom (I do have
an image) seems to have survived OK, since after replacement of both IC
I see the scanning signals on the driver side of the matrix, which
weren't there before.
Thanks for all input, Jos
31 May
31 May
8:56 a.m.
On Mon, 31 May 2004 07:46:23 +0200
Jos Dreesen <jos.mar(a)bluewin.ch> wrote:
While you've got the keyboard open would be a good time to back up the
contents of that EPROM.
Tony Duell heeft op maandag, 31 mei 2004 om 02:28 (Europe/Zurich) het
volgende geschreven:
Incidentally,
I assume there's an EPROM in the keyboard (The 8035
has no
internal ROM, the '373 sounds like an address latch). Did this
survive?
The '373 was indeed the addresslatch for the 8035. The eprom (I do
have an image) seems to have survived OK, since after replacement of
both IC I see the scanning signals on the driver side of the matrix,
which weren't there before.
10:12 a.m.
The '373 was indeed the addresslatch for the 8035. The eprom (I do
have an image) seems to have survived OK, since after replacement of
both IC I see the scanning signals on the driver side of the matrix,
which weren't there before.
While you've got the keyboard open would be a good time to back up the
contents of that EPROM.
9:47 a.m.
Tony Duell heeft op maandag, 31 mei 2004 om 02:28 (Europe/Zurich) het
volgende geschreven:
It is a 20 pin IC and it sits at the receiving end of the keyboard
matrix, the other side of the matrix is driven by two 74138.
That's it, then. An octal latching sense amplifier IIRC.
It took
out the 8035, a 74ls373 and, much worse, an unknown to me Exar
IC 22-908-03, datecode 1983
How many pins does this have?
THis sounds a lot like one of the 2 semi-custom ICs used with a
Keytronics capacitive keyboard. I've seen 22-908-3B and 22-950-3B used
in
the PERQ 2 series and elsewhere. They have 20 pins each. The former is
the (latching) sense amplifier between the 8 keyboard row lines and an
8
bit input on the microcontroller.
It seems to be the exact same IC. The keyboard is indeed a Keytronics.
You might be able to get a replacement for these from another
Keytronics
keyboard (e.g. a PC one).
I'l start looking around..
I should be able to find pinouts for the PERQ keyboard ICs.
I was hoping to kludge
a replacement with some TTL's, but this might be
difficult with a capacitive coupled keyboard. 
30 May
30 May
4:12 p.m.
On May 30, 2004, at 1:25 PM, Jos Dreesen wrote:
My Lilith workstation keyboard seems to have taken an
"electric"
beating, i.e. a 12 v to 5V short.
The wiring inside the machine was not the best......
A Lilith??? Is the the Modula-2 based system? If so, I envy you...
those are amazing machines!
Mark
8:59 p.m.
Mark Davidson heeft op maandag, 31 mei 2004 om 03:12 (Europe/Zurich)
het volgende geschreven:
A
Lilith??? Is the the Modula-2 based system? If so, I envy you...
those are amazing machines!
They seem to have an interesting architecture, if only the build
quality would have matched it, then my machine might have survived
better....
Some documents on Lilith have been put on the web recently :
www.cfbsoftware.com/modula2/
Jos
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days inactive
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ard＠p850ug1.demon.co.uk -
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