Author Topic: PCW IO schematic  (Read 677 times)

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Offline 19rsn007

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PCW IO schematic
« on: 12:07, 26 October 18 »
Hi people just a quick question.
I was wondering if the schematic of this is available in PDF format or such:
https://www.genesis8bit.fr/archives/index.php?news_id=588
I would like to build me a keyboard converter for the PCW I have without a keyboard.
I have the PIC and all other components can be bought, but I can't seem to find a usable schematic file, just tje Proteus project.The video part is less interesting for me, since my PCW has a working CRT screen, but I might give that a try later.

Offline JonB

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Re: PCW IO schematic
« Reply #1 on: 18:37, 26 October 18 »
You have to contact Habi.

He is on this forum, but spends more time on amstrad.es forum (Spanish speaking, but I get by with Google Translate).

Offline 19rsn007

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Re: PCW IO schematic
« Reply #2 on: 20:17, 26 October 18 »
I did contact habi, but he refers to the downloads on his website.The schematic is in Proteus format and since I don't have that, I can't open that file....

Offline JonB

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Re: PCW IO schematic
« Reply #3 on: 00:26, 27 October 18 »
Hmmm, I had a look but I could not see any downloads section. Got a link?

Offline robcfg

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Re: PCW IO schematic
« Reply #4 on: 12:14, 27 October 18 »
Here you have it.


I talked to Habi and he uploaded the schematic as an image.




Offline 19rsn007

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Re: PCW IO schematic
« Reply #5 on: 13:19, 27 October 18 »
Thanks! :)

Now for my next problem, the floppydrive not reading floppies :)
Think I am just gonna build me an adapter to fit a "normal" pc floppydrive in there since I have serveral spares :)

Offline 19rsn007

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Re: PCW IO schematic
« Reply #6 on: 22:08, 27 October 18 »
One quick question about that schematic.
What is this SEL1 signal on the input?Where does it come from?

Offline IanS

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Re: PCW IO schematic
« Reply #7 on: 01:50, 28 October 18 »
One quick question about that schematic.
What is this SEL1 signal on the input?Where does it come from?
Looking at the PCB picture, it looks like it's just a pin that can be pulled high (+5v) or low (GND) with a jumper link.

Offline 19rsn007

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Re: PCW IO schematic
« Reply #8 on: 11:46, 28 October 18 »
Ah, then my thought was right.
Pulling it high (with the 5,6k resistor to +5V) enables the video output, while pulling it low (with the resistor grounded) disables it.
Main reason I want to hook it up to composite right now is the fact I am working on restoring the pcw-10 I got and it will be easier if I can just hook it up to an external monitor so I won't have to discharge the CRT tube every time I want to work on the board.
Thanks for the heads up and confirmation

Offline JonB

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Re: PCW IO schematic
« Reply #9 on: 12:24, 28 October 18 »
If all you need is video output, maybe one of these would suffice?

http://www.cpcwiki.eu/forum/nc100-nc200-pcw-pda600/pcw-wont-start-anymore/msg166425/#msg166425

I have spare boards.

Offline 19rsn007

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Re: PCW IO schematic
« Reply #10 on: 13:15, 28 October 18 »
I saw those but shipping would kill me (to the Netherlands).
I didn't get any video output on my first try (but didn't have a 74HC00), but I will try again using the correct type of NAND gate.
The machine powers up just fine with only 5 Volts.

I see you use a transistor on your board and a potentionmeter on your board btw....would you be willing to share the schematic ?

Offline JonB

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Re: PCW IO schematic
« Reply #11 on: 19:59, 28 October 18 »
Shipping to the Netherlands would cost £2.60 for the built board or £1.25 for the bare board. How is that "killing" you?

You can have the bare board for £3.50 and the fully built unit for £10. Add the shipping and you have a bit of a bargain. I doubt you could build one for less.

Offline JonB

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Re: PCW IO schematic
« Reply #12 on: 20:09, 28 October 18 »
..
« Last Edit: 20:10, 28 October 18 by JonB »

Offline 19rsn007

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Re: PCW IO schematic
« Reply #13 on: 20:15, 28 October 18 »
Wow, I thought it would be more expensive.
I'll keep it in mind

Offline 19rsn007

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Re: PCW IO schematic
« Reply #14 on: 20:13, 29 October 18 »
Build the video thingie on a breadboard just now.
Now off to work on the floppydrive and getting it to boot ;)