22 Jul
2004
22 Jul
'04
4:30 p.m.
On 2004-Jul-22 13:09:46 Wolfgang wrote:
Mentioned TMS2532 Eproms are one of these Unobtainiums here.
I've had better
luck finding Hitachi's HN462532G version here... in Canada.
That may be worth checking for.
Looking at the Pinouts I have in my databooks there
are
little (minor?) Differences to the standard 2732's (besides
the different Program Supply Voltage). I couldn't find much
2732 and 2532
program at +25V, 2732A programs at +21V. +25V is fatal to
2732A. Don't ask me how I know that.
ressources online, but would it work if I made a
small
adapter like "illustrated" below...
2732 2532
EPROM -> SOCKET
Pin(s) Pin(s)
1-17 -> 1-17
18 (E) -> 20 (PD/PGM)
19(A10)-> 19 (A10)
20(GVpp)> 21 (Vpp)
No. The 2532 Vpp is always +5V when reading, and would keep
2732 outputs
always OFF. The 2532 has just one enable pin, while the 2732 has two.
Better to tie 2732-20 to 2532-18 (or to GND - outputs would be always
enabled when the chip is selected).
21(A11)-> 18 (A11)
22-24 -> 22-24
Please correct me, if I'm completely wrong and trying to do
something impossible.
Impossible? Nothing's impossible. Messy and difficult,
maybe.
2732's would be easy to obtain, and I have some
prommer-schematics and software handy. So it would be cool
if I could use them.
Regards,
Wolfgang
At VCF East 2.0 I brought along an EPROM programmer and some blank 2532s...
not that you would have considered that to be East at all... ;o)
Best of luck,
Bob
22 Jul
22 Jul
7:56 p.m.
In message <9726BA9DE867D51183B900B0D0AB85F802F128D6@INETMAIL>
RMaxwell(a)atlantissi.com wrote:
I've had better luck finding Hitachi's
HN462532G version here... in Canada.
That may be worth checking for.
I've got four known-good spare TMS2532s left,
but I don't really want to part
with them (I keep them as spares for other machines).
If you find anywhere that's selling HN462532Gs, I'll take a few.
I'm not sure if I've mentioned this before, but if anyone on cctalk/cctech
wants any EPROMs programming, I'll do it for cost-of-postage only, as long as
new EPROMs are provided. I've got a PREPROM-02aLV from <www.elnec.com>. If
it's on the device support list and doesn't need an adapter, I can program
the chip.
2732 and 2532 program at +25V, 2732A programs at +21V.
+25V is fatal to
2732A. Don't ask me how I know that.
Painful experience?
Another one - EPROMs that have been installed in the socket backwards in a
device that posesses a very big PSU tend to glow white-hot then die.
Impossible? Nothing's impossible. Messy and
difficult, maybe.
"Difficult we can do. Impossible might take a bit
longer."
At VCF East 2.0 I brought along an EPROM programmer
and some blank 2532s...
Got any spares left?
Later.
--
Phil. | Acorn Risc PC600 Mk3, SA202, 64MB, 6GB,
philpem(a)dsl.pipex.com | ViewFinder, 10BaseT Ethernet, 2-slice,
http://www.philpem.dsl.pipex.com/ | 48xCD, ARCINv6c IDE, SCSI
... I idiot-proof my programs, but then along comes a bigger idiot.
24 Jul
24 Jul
12:43 a.m.
On Fri, 23 Jul 2004 00:56:08 +0100
Philip Pemberton <philpem(a)dsl.pipex.com> wrote:
Painful experience?
Another one - EPROMs that have been installed in the socket backwards
in a device that posesses a very big PSU tend to glow white-hot then
die.
That's called a 'Light Emitting EPROM' and it's an expensive and
short-lived alternative to an LED.
2:44 a.m.
Scott Stevens wrote:
On Fri, 23 Jul 2004 00:56:08 +0100
Philip Pemberton <philpem(a)dsl.pipex.com> wrote:
>Painful experience?
>Another one - EPROMs that have been installed in the socket backwards
>in a device that posesses a very big PSU tend to glow white-hot then
>die.
But not always! I did this once, saw the bright glow and resignedly went
to burn a new EPROM. Just for laughs, I later tried to erase the
"burnt-out" part and to my surprise it was still functional and
subsequently served the project well. I should have noted the
manufacturer ;-)
-- HansP
8:23 a.m.
New subject: EPROM based lamps.
>> >>Another one - EPROMs that have been
installed in the
>> socket backwards in a device that posesses a very big PSU tend to glow
>> white-hot then die.
>>
>> But not always! I did this once, saw the bright glow and
>> resignedly went to burn a new EPROM. Just for laughs, I
>> later tried to erase the "burnt-out" part and to my
>> surprise it was still functional and subsequently served
>> the project well. I should have noted the manufacturer ;-)
During the mid-1980's I worked on a large number of projects that used
2716,2732,2674,27128 EPROMS. As A result, I plugged a number of them in
backwards over the years.
The ones most likely to glow were the 2732's. My initial experience was that
if you managed to power down before the circuit burned out, then the device
would erase and continue to work.
After some experimentation with this, a co-worker how had access to our Sem
[scanning electronic microscope] de-lidded one of the working units that had
glowed. Although the unit was still functional visible damage was easily
detected. It bacame company policy that any EPROM that was plugged in
backwards and powered up, had to be immediately scrapped [break off some
pins!] regardless of any obvious damage.
David.
8:52 a.m.
New subject: eBay interesting Items
Here go one link interesting for HP1000 owners:
http://cgi.es.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5111303805&ss…
MERC_VI
6:57 p.m.
That's called a 'Light Emitting EPROM' and
it's an expensive and
short-lived alternative to an LED.
Is this related to things like the SER (Smoke Emiting Resistor -- one
where the power rating is massivle exceeded), SEC (Sound Emitinf Capacitor
-- an electrolytic wired backwards), the Friode (a diode that's
open-circuit both ways), etc?
-tony
9:35 p.m.
New subject: Obscure Parts....
On the topic of unusual devices, does anyone have and spare SED [sound
emiting diode] or DED [dark emitting diode]. There were both advertised in
EDN Magazine a long time ago [mid 1980's if I recall, note sure of the exact
year, but it was probably sometime around April...]
Cant seem to find any current manufacturers....
David.
>> -----Original Message-----
>> From: cctalk-bounces(a)classiccmp.org
>> [mailto:cctalk-bounces@classiccmp.org] On Behalf Of Tony Duell
>> Sent: Saturday, July 24, 2004 6:57 PM
>> To: cctalk(a)classiccmp.org
>> Subject: Re: Commodore Pet ROM trouble... EPROM Substitutes...
>>
>> > That's called a 'Light Emitting EPROM' and it's an expensive
and
>> > short-lived alternative to an LED.
>>
>> Is this related to things like the SER (Smoke Emiting
>> Resistor -- one where the power rating is massivle
>> exceeded), SEC (Sound Emitinf Capacitor
>> -- an electrolytic wired backwards), the Friode (a diode
>> that's open-circuit both ways), etc?
>>
>> -tony
29 Jul
29 Jul
7:41 p.m.
> That's called a 'Light Emitting EPROM'
and it's an expensive and
> short-lived alternative to an LED.
Is this related to things like the SER (Smoke Emiting
Resistor -- one
where the power rating is massivle exceeded), SEC (Sound Emitinf Capacitor
-- an electrolytic wired backwards), the Friode (a diode that's
open-circuit both ways), etc?
Sounds like what Lucas Electric used to use.
http://pw1.netcom.com/~krk/lotus/humor/lucasjokes.html
--
J Brian Ismay
jismay(a)unixboxen.net
30 Jul
30 Jul
12:25 p.m.
New subject: Lucas Electrics: RE: Commodore Pet ROM trouble... EPROM Substitutes...
At 04:41 PM 7/29/04 -0700, you wrote:
ROFL! Only someone who's had a vehicle with Lucas electronics could
truely appreciate that!
Joe (x-1952 MG TD)
> That's
called a 'Light Emitting EPROM' and it's an expensive and
> short-lived alternative to an LED.
Is this related to things like the SER (Smoke
Emiting Resistor -- one
where the power rating is massivle exceeded), SEC (Sound Emitinf Capacitor
-- an electrolytic wired backwards), the Friode (a diode that's
open-circuit both ways), etc?
Sounds like what Lucas Electric used to use.
http://pw1.netcom.com/~krk/lotus/humor/lucasjokes.html 
6:58 p.m.
New subject: Lucas Electrics: RE: Commodore Pet ROM trouble... EPROM Substitutes...
On Fri, 30 Jul 2004, Joe R. wrote:
At 04:41 PM 7/29/04 -0700, you wrote:
ROFL! Only someone who's had a vehicle with Lucas electronics could
truely appreciate that!
Joe (x-1952 MG TD)
...or had experience with Magneti Morelli eqquipment!
- don
>
That's called a 'Light Emitting EPROM' and it's an expensive and
> short-lived alternative to an LED.
Is this related to things like the SER (Smoke
Emiting Resistor -- one
where the power rating is massivle exceeded), SEC (Sound Emitinf Capacitor
-- an electrolytic wired backwards), the Friode (a diode that's
open-circuit both ways), etc?
Sounds like what Lucas Electric used to use.
http://pw1.netcom.com/~krk/lotus/humor/lucasjokes.html
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ard＠p850ug1.demon.co.uk -
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philpem＠dsl.pipex.com -
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