Re: ps/2 for cbm 700

From: Steve Gray <sjgray_at_rogers.com>
Date: Sat, 24 Mar 2018 13:42:02 +0000 (UTC)
Message-ID: <9569672.223227.1521898922649@mail.yahoo.com>
Hi,
I send you this link previously: PET Keyboard Expansion Project
  
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PET Keyboard Expansion Project
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You'll see at the bottom the 700 keyboard matrix wiring and connector pinouts at the bottom. I hope my diagrams are clear enough.
Steve

      From: didier derny <didier@aida.org>
 To: cbm-hackers@musoftware.de 
 Sent: Saturday, March 24, 2018 5:00 AM
 Subject: ps/2 for cbm 700
   
  I'm making a ps2 interface for the cbm 700
 but I have very little information on this machine  (not seen it since 1984/1985)
 
 Apparently there are not connector inside the machine ?
 only a DB25 connector   ?
 
 from the schematics on zimmer I made this table:   
| SIGNAL | PORT | PIN 6525 | PIN DB25 |
| ROW0 | PC0 | 25 | 13 |
| ROW1 | PC1 | 26 | 19 |
| ROW2 | PC2 | 27 | 20 |
| ROW3 | PC3 | 28 | 21 |
| ROW4 | PC4 | 29 | 23 |
| ROW5 | PC5 | 30 | 13 |
| 
  | 
  | 
  | 
  |
| COL0 | PA0 | 2 | 12 |
| COL1 | PA1 | 3 | 11 |
| COL2 | PA2 | 4 | 10 |
| COL3 | PA3 | 5 | 9 |
| COL4 | PA4 | 6 | 8 |
| COL5 | PA5 | 7 | 7 |
| COL6 | PA6 | 8 | 6 |
| COL7 | PA7 | 9 | 5 |
| COL8 | PB0 | 10 | 17 |
| COL9 | PB1 | 11 | 4 |
| COL10 | PB2 | 12 | 16 |
| COL11 | PB3 | 13 | 3 |
| COL12 | PB4 | 14 | 15 |
| COL13 | PB5 | 15 | 2 |
| COL14 | PB6 | 16 | 14 |
| COL15 | PB7 | 17 | 1 |
| 
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  | 
  | 
  |
| GND | 
  | 
  | 22 |
| GND | 
  | 
  | 23 |
| GND | 
  | 
  | 24 |

 
 
 
 could you confirm if it's correct 
 - not sure row/col are not inverted 
 - not sure the col number are not inverted
 - not sure the row number are not inverted
 
 thanks
 
  

   
Received on 2018-03-24 15:00:02

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