Re: Can I use a US motherboard in my European Apple IIe?
- From: "Bryan Parkoff" <nospam@xxxxxxxxxx>
- Date: Sat, 17 Sep 2005 23:23:07 GMT
"Knut Roll-Lund" <kr-lund@xxxxxxxxxxxxxxxxxxx> wrote in message
news:0tadnVSuSKH3HrHeRVnzvA@xxxxxxxxxxxxxx
> Well, I'm asking this because it might be a solution to my RGB problem.
>
> If I get a US IIe motherboard and put this in my European IIe I will get
> 60Hz video, is this the only difference apart from the aux port being in a
> different place? Will the powerplug fit? Are the voltages supplied by the
> European powersupply be the same? Anything I haven't though of? (yes, yes,
> yes, no I think)
Knut,
This is Bryan Parkoff. I appreciate that you have shared technical
difficulties with us. I have already discussred with you via e-mail
directly that it has to do with crystal osc chip to manipulate 50Hz and
60Hz. Crystal OSC chip with 14.25MHz outputs 50Hz to sustain 312 lines for
PAL monitors using 50Hz for European. Another crystal OSC chip with
14.32MHz outputs 60Hz to sustain 262 lines for NTSC monitors in North
America. Two different OSC chips manipulate everything in the motherboard
including aux slot, 7 slots, RAM, etc.
You can use 50HZ or 60Hz in either North America or European that it
works fine. You can obtain US Apple //e motherboard (unenhanced or
enhanced) with 14.32MHz Crystal OSC chip. I am concerned that power supply
does not sustain 240 volts because it does not have a switch. I recommend
that you obtain another power supply to replace US power supply which it has
a switch of 120 volts and 240 volts.
In my conclusion, US motherboard works fine in European using 240 volts
with no problems, but please note that it does not need to connect to PAL
monitors.
Please let me know if you have succeeded resolving the problem with IBM
5153 monitor (rolling the screen) and US Apple //e motherboard. If you wish
to use NTSC monitor in European, do not forget that you need 240 volts to
120 volts box otherwise 240 volts can destroy NTSC monitor by overloading
voltages.
Bryan Parkoff
>
> So, why...
>
> I got an RGB card, the digital Apple RGBI card (made by Video-7) see
> previous threads. I have tried several monitors without much success. The
> best result was with a CGA 5153 monitor. I had to invert the sync
> (composite sync applied to hsync in the CGA) but apart from that it is
> just to match pin to pin on the from the 15pin of the Apple to the 9pin of
> the CGA. The problem with this CGA is that even if it is a european
> monitor it does 60Hz and the picture rolls with the 50Hz signal form the
> Apple. If you like http://home.online.no/~kr-lund/a2e-cga.avi links to a
> small 1.7MB film of the CGA test result. So if I change my motherboard to
> a US one I will get 60Hz video and the CGA should work.
>
> If I could get hold of the proper monitor or even an analog monitor that
> is suitable I wouldn't need to do that but it seems that these are hard to
> come by and those that still have such hold on to them. Even a CGA monitor
> is pretty impossible to come by, and yes - I hold on to mine (I sometimes
> use it with a PC-AT clone with a CGA card).
>
> Knut
.
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