29 Jan
2011
29 Jan
'11
1:43 p.m.
Interesting - presumably the colour PAL board also
does the bus termination
(my bus terminator card's also labelled as being for black and white video,
although components for that aspect aren't fitted - presumably it was used on
40x25 systems without the hi-res option)
I am a little puzzled. AFAIK you can make a minimal system with no bus
cable or termiantor atall -- just the CPU board linked ot the 40 column
VDU. Video output comes from the VDU card.
Do you have any idea waht sort of components could be fitted on the
terminator bord? Are there spaces for (DIL) ICs, or jsut discretes?
... plus
an "RGB board" mounted on the back panel, which has RGBS BNC outputs
and hooks to the 26-way header on VDU #2. VDU #1 and VDU #2 are connected
together via 16-way DIL headers on the boards.
I don't have that. Does it have a case fan? What about voltage regulators
mounted on the rear of
the case? The latter were early machines I think and quite uncommon. Typical
machines have the voltage regs internally and a chassis fan fitted, although I
know there's at least one machine out there with internal regs and no
forced-air cooling.
I am pretty sure my 380Z (and all the ones I used at school) has the
voltage reguatlors mounted internally (on the metal cover over the PSU
area) and a fan.
There are at least 2 versions ofthe 5.25" machine. One has a pair
offull-heigfht drives fitted horizotnally, the otehr has a pair of 2/3
height (!) drives mounted vertically. The latter seems more common.
I'm not sure how close to the limit the systems
typically run - .75A might
work I suppose, just for testing (and at least for soak-testing the PSU under
a dummy load, if you decide to do that)
I am pretty sure the PSU will draw less than 750mA with no load. I don't
know about the switch-on surge though a 750mA anti-surge fuse would
probably be OL< a quick blow one may not be.
-tony