Posted By
Hans
on 2013-02-17
12:39:16
|  Re: Dead TEDs and plus 4 keyboard
Dead Ted said:
I just wish someone could create a plus 4 on a chip like the commodore dtv, we could then slot this little board inside the plus 4 case, wire it into the keyboard, along with an sd card reader and voila!
Would be nice, but it's very unlikely that somebody will sit down and do that work.
Generally spoken, one of the 264 series main problem is the heat generated by the chips and the poor heat exhaust.
It's not a big problem (and does cost only a few pennies/cents) to protect the sensitive chips CPU / TED / PLA with heat sinks. Unfortunately, there's not enough space inside the clad to put a blower into it.
A further problem source -heatwise- is the cheap, old fashioned 7805 voltage regulator with its ceramic resistor. This one generates an enormous surface temperature which often affects the neighbouring ICs. - Maybe that switch controllers resp. regulators haven't been invented when the 264 machines were built - it's, however, more likely that such chips were already available but Commodore decided to go the "cheap" way...
Nowadays, it's quite simple to replace the dangerous 7805 against a switch regulator and to get rid of the accompanying resistor at all. A typical regulator is the DC/DC converter TSR 1-2450. Price in Germany between € 8 and € 12, depending on the supplier. Should be available almost everywhere.
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