>> Oric-1, eh ? Translated from _L'Oric nu_ :
>> A nice old Oric-1, yes.
>>> #F535: Write X into PSG 8912 register A>>>>>>>> The V1.0 ROM version of this routine takes too much time t>>
>> write the value after selecting the register which makes >>
>> very picky with 8912 chips and how hot they run. The vers>>n
>> in the V1.1 ROM is more reliable because it is faster. THI>>IS
>> WHY SO MANY ORIC-1 WITH PERFECTLY GOOD HARDWARE WERE RET>>NED
>> FOR SE>VI>E.
> Is it possible to upgrade to the V1.1ROM?
If you have one (or a 27128 and an EPROM programmer), >es.
> Or will it be reasonable to check the connections on the>8912?
> Or even replace it with a new one? I see the 8912-chips aren'> that
> expensive to get, so I could order 3 or 4.
Yes, although it's not socketed so you'll have to desolder a
28-pin chip first, which might not be easy if you don't have the
equipment and the experience.
But first, I'd try re-seating the keyboard PCB. You could also
try putting a heat sink on the 8912 :
Or whatever piece of aluminium foil you have handy, 0.5 to 1.5 mm
thick, tacked to the top of the body with thermal grease. Check
that it fits inside the case and doesn't come off the chip and
short something else on the PCB !
Andrlt;Majorel http://www.yqcomputer.com/ ~>majorel/>
"Je regrette le Concorde. Au moins il vous amenait directement
l'hel." -- Cyrano