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Author Topic: C7420 documentation  (Read 10363 times)
manopac
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« on: May 05, 2009, 03:48:19 PM »

Hi !

does anyone here have a circuit diagram of the C7420 ?
and even more important: the BIOS of the C7420 ? (-> the code which is run on the Z80 inside ...)

and by anyone I of course mean Rene :-) (or maybe someone else would have eg. the circuit diagram?)

and maybe even a scanned manual for the C7420 ? (german or english ...)

thanks
Mark
« Last Edit: May 05, 2009, 03:55:52 PM by manopac » Logged

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Rene_G7400
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« Reply #1 on: May 05, 2009, 06:07:09 PM »

Yes, I have the Service Manual of the C7420, and I have made dumps of the ROM's in the cartridge (for the 8048) and in the module (for the Z80).
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Rene_G7400
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« Reply #2 on: May 05, 2009, 11:25:32 PM »

I even have a spare german user manual for the C7420 which you can buy from me, and a spare Service Manual.
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grgh
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« Reply #3 on: May 05, 2009, 11:49:51 PM »

I'd be interested in the service manual if you dont work something out.
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Rene_G7400
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« Reply #4 on: May 06, 2009, 09:43:11 AM »

You can find scans of the circuit diagram here:
http://home.kpn.nl/~mdr.vd.enden/download/c7420_1.gif
http://home.kpn.nl/~mdr.vd.enden/download/c7420_2.gif
http://home.kpn.nl/~mdr.vd.enden/download/c7420_3.gif
« Last Edit: May 09, 2010, 10:43:36 PM by Rene_G7400 » Logged
manopac
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« Reply #5 on: May 06, 2009, 04:56:05 PM »

wow, thanks a lot !!! thats exactly what I need :-)

about the manual: I have a french and a german one, I was just hoping that someone scanned it already so that I don't have to do it myself ... does anyone know if an english manual exists ?

grgh: go ahead and make Rene an offer for the service manual, I'm not really collecting those anymore

Am working on a nice project with some of my students involving the C7420, will let you know once its in a more advanced state Smiley (so far I can only say that I destroyed one of my C7420's yesterday in the process ... damn, these things are fragile Sad )

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Rene_G7400
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« Reply #6 on: May 06, 2009, 05:12:35 PM »

does anyone know if an english manual exists ?

Since the G7400 wasn't released in the UK, I don't think an english manual for the C7420 exists.

(so far I can only say that I destroyed one of my C7420's yesterday in the process ... damn, these things are fragile Sad )

I know, I've already had to fix two of them.

I hope to hear more about your projects soon.  Smiley
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manopac
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« Reply #7 on: May 06, 2009, 05:27:43 PM »

hm ... can I send you all the ones we fried for repairing once we are done ?  Cool
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Rene_G7400
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« Reply #8 on: May 06, 2009, 05:44:55 PM »

hm ... can I send you all the ones we fried for repairing once we are done ?  Cool

How many C7420's do you have?  Grin
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grgh
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« Reply #9 on: May 06, 2009, 08:14:47 PM »

does anyone know if an english manual exists ?
Since the G7400 wasn't released in the UK, I don't think an english manual for the C7420 exists.

Strange, what with the box being in English. I certainly don't have an English copy of the manual.
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manopac
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« Reply #10 on: May 06, 2009, 09:27:00 PM »

How many C7420's do you have?  Grin

1 broken, 1 working, 1 untested .... 2 german manuals, 2 french manuals, 1 box, 2 (different) keyboard stickers with the Basic-Commands ...

so worst case I would send you three :-)
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Rene_G7400
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« Reply #11 on: May 06, 2009, 09:48:23 PM »

1 broken,

What do you see on your TV screen when you switch the G7400 on with the broken C7420 plugged in?
What were you trying to do with this C7420 before it broke?
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Rene_G7400
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« Reply #12 on: May 06, 2009, 09:49:22 PM »

Strange, what with the box being in English.

Maybe a prototype of the english manual exists...
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manopac
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« Reply #13 on: May 06, 2009, 10:20:24 PM »


What do you see on your TV screen when you switch the G7400 on with the broken C7420 plugged in?
What were you trying to do with this C7420 before it broke?


black / white screen, cursor blinking left upper corner, no init with the Basic Intro

I just plugged the audio-out it into my PC's audio-in port ...
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Rene_G7400
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« Reply #14 on: May 06, 2009, 10:34:39 PM »

black / white screen, cursor blinking left upper corner, no init with the Basic Intro

Sounds very familiar...  Sad

I just plugged the audio-out it into my PC's audio-in port ...

And your PC was not connected to ground?
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