hello,I want to ask question

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hello,I want to ask question

http://seb.riot.org/appleII/keyboard.sml

I want to investigate this article.but when I translate this one for chinese.I don't understand something.comment describe 5V
if this IC PIC16F630 obtain 5V.do I need to connect line to 6-pin Mini-DIN ?and what is mean for this schematics?5V C1 GND
hope can get every expert respond.thx

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Last seen: 8 months 4 weeks ago
Joined: Jul 13 2007 - 07:06
Posts: 182
Re: hello,I want to ask question

[quote=adoreapple]http://seb.riot.org/appleII/keyboard.sml

I want to investigate this article.but when I translate this one for chinese.
I don't understand something.
comment describe 5V if this IC PIC16F630 obtain 5V.
do I need to connect line to 6-pin Mini-DIN from pic16f630?
what is mean for this schematics?5V C1 GND

hope can get every expert respond.thx

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Last seen: 8 months 3 weeks ago
Joined: Dec 19 2003 - 18:53
Posts: 906
Re: hello,I want to ask question

5v = 5 volts
C1= Capacitor #1
GND=Ground

Good luck with your project.

Mutant Pie

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Posts: 109
Re: hello,I want to ask question

If you don't want to make one, Vince Briel sells a PS/2 adapter with replacement encoder:

http://www.brielcomputers.com/wordpress/?cat=9

I have a couple and they're very useful.

gew
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Joined: Mar 2 2011 - 13:50
Posts: 11
Re: hello,I want to ask question

There is an other PS2 to Apple ][ project:

http://www.willegal.net/appleii/appleii-kb-int.htm

PS: Does anybody know a solution for a //e?

cu
Georg

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Re: hello,I want to ask question

I looked at doing a version for the IIe, but dropped the effort when I realized the keyboard encoder for the IIe was simply moved to the motherboard. These encoders poll the keyboard matrix with a -12 volt strobe. I didn't investigate much further, as I figured that handling the -12 volt strobe input and output with a micro-controller would require voltage level shifting that would increase the HW cost and complexity to the point that it wouldn't be worth the trouble.

Regards,
Mike W.

gew
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Last seen: 6 years 2 months ago
Joined: Mar 2 2011 - 13:50
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Re: hello,I want to ask question

Hello Mike,

these are bad news :-(.

I was thinking about doing a test on a breadboard with an AVR. But you are right with the -12V.

I did not see the -12V going to Pin 27 of the keyboard controller.

Therefore connecting to the keyboard header is not the way.

But did you think about replacing the keyboard controller with a PCB with an PS2 interface?

On brielcomputers it was done with the original Apple ][ keyboard controller.

cu
Georg

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