[N8VEM: 17370] Looking for a simple low cost PS/2 keyboard interface circuit.

[Leslie Anderson]

Hi.

I'm new to home-brew microcomputers , and the N8VEM group. As a newbie I'm
still on a steep learning curve and have come across several parts of my
design that I need help with.

1) I need a circuit to read a PS/2 keyboard... either using a
micro-controller or CPLD etc.. but there's quite a few designs on the web
and I just Ideally need a low cost single chip solution... does anyone have
any pointers ?

2) I'm looking at the MAX705 as a RESET/PWR on reset circuit.. is there
anything better out there that I could use for this function. Both to give
a reliable Manual Reset and a Stable Power on Reset function ?

Best Regards
Lez

[oscarv]

Lez,

Re the PS/2 interfacing, you may get a clear idea from these two links:

PS/2 keyboard on two pins of the 8255 parallel port. The schematics of the
N8VEM VDU card show the (very simple) hardware side:
http://n8vem-sbc.pbworks.com/w/file/47979210/Printing%20VDU%20V2-sch.pdf
and the accompanying source code is here:
http://n8vem-sbc.pbworks.com/w/file/4201437/vduterm.ASM

Regards,

[Dan Werner]

I would also take a look a the PS/2 controller on the Color VDU. It is
much easier to program that the 8255 on the original VDU.

Dan

Post by oscarv
Lez,
PS/2 keyboard on two pins of the 8255 parallel port. The schematics of the
http://n8vem-sbc.pbworks.com/w/file/47979210/Printing%20VDU%20V2-sch.pdf
http://n8vem-sbc.pbworks.com/w/file/4201437/vduterm.ASM
Regards,
Oscar.
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[neilbradley]

Try one of these:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=271411089275

The data sheet is in the link. Super simple PS/2 interfacing, and cheap.

-->Neil

Post by Leslie Anderson
Hi.
I'm new to home-brew microcomputers , and the N8VEM group. As a newbie I'm
still on a steep learning curve and have come across several parts of my
design that I need help with.
1) I need a circuit to read a PS/2 keyboard... either using a
micro-controller or CPLD etc.. but there's quite a few designs on the web
and I just Ideally need a low cost single chip solution... does anyone have
any pointers ?
2) I'm looking at the MAX705 as a RESET/PWR on reset circuit.. is there
anything better out there that I could use for this function. Both to give
a reliable Manual Reset and a Stable Power on Reset function ?
Best Regards
Lez