20 Apr
2006
20 Apr
'06
10:20 a.m.
At 09:01 AM 4/20/2006, you wrote:
I found one of these on ebay (8278074346). I have never
seen or heard
of it before, does anyone here have one ?
You meant 8278074345 or 8796143722 .
Uncommon, that's all. If you look at completed listings, there
were three recently, at about US $65.
- John
21 Apr
21 Apr
12:35 a.m.
On 4/21/06, John Foust <jfoust at threedee.com> wrote:
At 09:01 AM 4/20/2006, you wrote:
That's not too bad for a working one. I used to get them for about
$35 to $50 (I have two or three myself) in not-necessarily-working
state ('though I did get hosed for shipping on one when the guy took
it to Mailboxes, Etc., and sent it COD - I think the shipping was
$75).
The two most common failures in my experience are the PLA (82S100 -
identical to the one in a standard C-64) and the keyboard. It's a
cheap membrane affair - one of my SX-64 keyboards broke under the
previous owner - intermittent contacts, I'd guess, and he tried to
repair it - total mess now. Fortunately, I happened to have *1* spare
keyboard out of a pile of parts I'd gotten from a defunct C= dealer.
They also occasionally suffer from occasional internal interconnect
problems - typically with the cartridge slot. Reseating connectors
typically fixes that problem.
Fun to tote around to club meetings and such, but can be a hassle to
repair - there's a lot of stuff packed in a very small space - gets to
be convoluted. One important missing feature for some add-ons... no
cassette port (I think the cassette routines are patched around in the
SX ROMs). While it doesn't matter for most things, there are
peripherals that depend on the cassette port for power or power and
data (like Marko Makela's CN232 serial adapter).
$900, though, is, um, rather high.
-ethan
I found one of these on ebay...
You meant 8278074345 or 8796143722 .
Uncommon, that's all. If you look at completed listings, there
were three recently, at about US $65. 
2:47 a.m.
On Friday 21 April 2006 12:35 am, Ethan Dicks wrote:
The two most common failures in my experience are the
PLA (82S100 -
identical to the one in a standard C-64) and the keyboard.
If I understand this stuff right, "82S100" is the part number for that chip
in generic, unprogrammed form. They had a different number for it,
906114-01 or something like that.
<...>
One important missing feature for some add-ons... no
cassette port (I think
the cassette routines are patched around in the SX ROMs). While it doesn't
matter for most things, there are peripherals that depend on the cassette
port for power or power and data (like Marko Makela's CN232 serial adapter).
Or most common in my experience, printer adapters, like "Cardco" and such.
One of our regular mods was to remove that silly adapter provided with those
and put a banana plug on the end of the wire, with a corresponding jack
mounted in the back of the computer.
$900, though, is, um, rather high.
Yeah.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
5:53 a.m.
On 4/21/06, Roy J. Tellason <rtellason at blazenet.net> wrote:
On Friday 21 April 2006 12:35 am, Ethan Dicks wrote:
Yes. Someone did work out the fuse map at one point, so if you had a
suitable programmer and a blank 82S100, you could crank out fresh
PLAs.
-ethan
The two most common failures in my experience are
the PLA (82S100 -
identical to the one in a standard C-64) and the keyboard.
If I understand this stuff right, "82S100" is the part number for that chip
in generic, unprogrammed form. They had a different number for it,
906114-01 or something like that.
4:11 p.m.
On Friday 21 April 2006 05:53 am, Ethan Dicks wrote:
On 4/21/06, Roy J. Tellason <rtellason at
blazenet.net> wrote:
That'd be nice...
Not that I have a programmer for those, but that really was a common failure
item in those machines, for some reason.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
On Friday 21 April 2006 12:35 am, Ethan Dicks
wrote:
Yes. Someone did work out the fuse map at one point, so if you had a
suitable programmer and a blank 82S100, you could crank out fresh
PLAs. The two most common failures in my experience are
the PLA (82S100 -
identical to the one in a standard C-64) and the keyboard.
If I understand this stuff right, "82S100" is the part number for that
chip in generic, unprogrammed form. They had a different number for it,
906114-01 or something like that. 
4:46 p.m.
On Friday 21 April 2006 05:53 am, Ethan Dicks wrote:
http://www.6502.org domain has expired :( (Google has the main
page cached from April 15, 2005) and http://www.zimmers.net seems to
be down.
From my search today it seems these are the places that have
the fuse map.
Cheers,
Bryan
Trenton Computer Festival is this weekend - MARCH will be there!
On 4/21/06, Roy J. Tellason <rtellason at
blazenet.net> wrote:
That'd be nice...
Not that I have a programmer for those, but that really was a common failure
item in those machines, for some reason.
On Friday 21 April 2006 12:35 am, Ethan Dicks
wrote:
Yes. Someone did work out the fuse map at one point, so if you had a
suitable programmer and a blank 82S100, you could crank out fresh
PLAs. The two most common failures in my experience are
the PLA (82S100 -
identical to the one in a standard C-64) and the keyboard.
If I understand this stuff right, "82S100" is the part number for that
chip in generic, unprogrammed form. They had a different number for it,
906114-01 or something like that. 
4:52 p.m.
In article <20060421204649.6BD6758265 at mail.wordstock.com>,
bpope at wordstock.com (Bryan Pope) writes:
http://www.6502.org domain has expired :(
Ouch! Hopefully its just a temporary outage.
Did you try the Wayback Machine on <http://www.archive.org>?
--
"The Direct3D Graphics Pipeline"-- code samples, sample chapter, FAQ:
<http://www.xmission.com/~legalize/book/>
Pilgrimage: Utah's annual demoparty
<http://pilgrimage.scene.org>
5:02 p.m.
In article <20060421204649.6BD6758265 at mail.wordstock.com>,
bpope at wordstock.com (Bryan Pope) writes:
I just did and they have a copy from March 10, 2005.. It will take
awhile to grep through it to find the fuse map.
Cheers,
Bryan
http://www.6502.org domain has expired :(
Ouch! Hopefully its just a temporary outage.
Did you try the Wayback Machine on <http://www.archive.org>? 
24 Apr
24 Apr
12:28 p.m.
Bryan Pope wrote:
It appears to be back up.
--
Jim Leonard (trixter at oldskool.org) http://www.oldskool.org/
Help our electronic games project: http://www.mobygames.com/
Or check out some trippy MindCandy at http://www.mindcandydvd.com/
A child borne of the home computer wars: http://trixter.wordpress.com/
In article <20060421204649.6BD6758265 at mail.wordstock.com>,
bpope at wordstock.com (Bryan Pope) writes:
I just did and they have a copy from March 10, 2005.. It will take
awhile to grep through it to find the fuse map. http://www.6502.org domain has expired :(
Ouch! Hopefully its just a temporary outage.
Did you try the Wayback Machine on <http://www.archive.org>? 
21 Apr
21 Apr
6:13 p.m.
On 4/21/06, Roy J. Tellason <rtellason at blazenet.net> wrote:
Given the fuse map and the 82S100 data sheet, it's easy to work out the
logic equations. It should be possible to program some more modern CPLD
to replace this chip, I would have thought.
The basic architecture of the 82S100 is that there are 16 inputs. These,
and their inverses, can be ANDed in any combination to make 48 'product
terms'. The 8 outputs are produced by ORing any combination of the
product terms (note you can use the same product term in more than 1
output if you want). Each output can also be inverted if desired.
Note that unlike a PAL or GAL, you program both the AND and OR matricies.
And the device is a lot faster than most traditional EPROMs.
-tony
On Friday 21 April 2006 12:35 am, Ethan Dicks
wrote:
Yes. Someone did work out the fuse map at one point, so if you had a
suitable programmer and a blank 82S100, you could crank out fresh
PLAs. The two most common failures in my experience are
the PLA (82S100 -
identical to the one in a standard C-64) and the keyboard.
If I understand this stuff right, "82S100" is the part number for that chip
in generic, unprogrammed form. They had a different number for it,
906114-01 or something like that.
6665
days inactive
6669
days old
9 comments
7 participants
participants (7)
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ard＠p850ug1.demon.co.uk -
bpope＠wordstock.com -
ethan.dicks＠gmail.com -
jfoust＠threedee.com -
legalize＠xmission.com -
rtellason＠blazenet.net -
trixter＠oldskool.org