Tony Duell wrote:
> Another trick that I've used is to use 2764s (easy to find). You can
> fit them into the 24 pin socket, and just about all the pins match
> up. Solder wires (or some other kludge) to connect pin 2 (A12), 1
> (Vpp), 28 (Vcc), 27 (PGM/), 36 (Not used, but now in pin 24 of the
> socket, so that it's +5V) together after programming the 4K image
> into the upper half of the chip.
I take it you mean pin *26*, not 36... Looks like I might be able to do
that. If I can get hold of some 2764s. Unfortunately nearly all the
programmable memory devices in my junk^H^H^H^H quality used parts box are
27128s, 27256s or Intel/Catalyst 28F010s. Oh, and I've got a few 27512s if
they're any good...
> I would have to hunt for them, but I might have a couple of new
> Hitachi 462532s in the OTP (plastic) package.
[snip]
> I have no idea if they're good, and I don't think I can easily program
> them (that was to be another project if I had to re-burn the firmware
> for the meter), but if I can find them, are they any use to you?
If you can find them, they'll be very useful as they're (supposedly) pin
compatible with the TMS2532.
>> And just when I thought this year couldn't get any worse, my
>> Sansui 210 tuner-amp decided to blow its right aux channel this
>> morning. Although this
> Do you mean it's just one input that's failed? It's the output stages
> that normally give trouble.
Yup. Right input, auxiliary channel. Totally stuffed.
> You do, of course, have a ready-made reference circuit to compare
> against
> -- namely the left hand channel :-)
Good point.
Later.
--
Phil.
philpem_at_dsl.pipex.com
http://www.philpem.dsl.pipex.com/
Received on Sun Dec 22 2002 - 18:13:00 GMT