7 Nov
2010
7 Nov
'10
3:32 p.m.
On 7 Nov 2010 at 19:47, Tony Duell wrote:
The UK model uses and STK7308 switching regulator
hybrid module. Do
you happen to know if yours does too?
Does it have 60 Hz vertcial sync? In these machines, the video and
syncs are generated bu the Amstrad 40028 gate array (IC 101 on the
logic board) which also contains the trivial bootstrap ROM (thre is no
seprate ROM or EPROM on the logic board). So I would assume that if
the sync rate is changed, this chip has ot be something different.
When I get a chance, I'll get a screwdriver out and check it, but my
memory is that I used the standard (European) schematic to locate and
replace one of those silly little circuit protectors in the power
supply--with a picofuse of the same rating.
That Amstrad gate array is the principal thing I really don't like
about the machine. Undocumented and probably irreplaceable.
Otherwise, a decent graphics display, lots of RAM, what's not to
like?
--Chuck