7 Nov
2010
7 Nov
'10
11:47 a.m.
On 6 Nov 2010 at 21:14, Tony Duell wrote:
OK, I beleive you :-).
The service manuals I have to hand make no
reference to a 120V model.
Mine definitely says 120V 60Hz 1.1A on the back plate. Made in Korea, FCC ID A7R9K2PC-4A. No mention of Amstrad UK,
but rather
Amstrad International (USA) Inc., 3202 Doolittle Drive, Northbrook,
IL, 60062. The curious thing is that the label refers to it as a
"monitor". No reference to it being a computer of any sort.
Odd. I assume the main logic board is much the same as the UK version,
but the PSU/monitor board is different. Probably just differences in the
mains input circuitry.
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.
Actually, the standard configuration has drive 0
as a single-head 40
cylinder drive taking 'flippy' disks and the optional drive 1 as a
double-head 80 cylidner drive. The latter was much the same logically
as a noraml 720K drive.
Yes, but that's useless if what you want to do is boot from a 720K
and have 2x720K of floppy storage online.