Date   : Sun, 04 Oct 2009 22:34:37 +0100
From   : jgh@... (Jonathan Graham Harston)
Subject: Centronics to Serial

In fact, to be consistent, I'd recommend using the printer-user
port cable used with John Kortink's 65Link, viz:
 
  Printer          <--->  BBC
 
  Pin 1 (nSTROBE)  <--->  Pin 2 (CB1)
  Pin 2 (DATA 0)   <--->  Pin 6 (PB0)
  Pin 3 (DATA 1)   <--->  Pin 8 (PB1)
  Pin 4 (DATA 2)   <--->  Pin 10 (PB2)
  Pin 5 (DATA 3)   <--->  Pin 12 (PB3)
  Pin 6 (DATA 4)   <--->  Pin 14 (PB4)
  Pin 7 (DATA 5)   <--->  Pin 16 (PB5)
  Pin 8 (DATA 6)   <--->  Pin 18 (PB6)
  Pin 9 (DATA 7)   <--->  Pin 20 (PB7)
  Pin 10 (nACK)    <--->  Pin 4 (CB2)
* Pin 18 (0V)      <--->  Pin 5 (0V)
* Pin 19 (0V)      <--->  Pin 7 (0V)
* Pin 20 (0V)      <--->  Pin 9 (0V)
* Pin 21 (0V)      <--->  Pin 11 (0V)
* Pin 22 (0V)      <--->  Pin 13 (0V)
* Pin 23 (0V)      <--->  Pin 15 (0V)
* Pin 24 (0V)      <--->  Pin 17 (0V)
  Pin 25 (0V)      <--->  Pin 19 (0V)
 
Then, program the User VIA to latch input data on CB1 and generate
an interupt. On the interupt, store the received byte in a buffer
somewhere. In the foreground copy data from the buffer to disk,
etc.
 
Digging through old code shows we were discussing exactly this on
the list in May 1999!
 
-- 
J.G.Harston - jgh@...                - mdfs.net/User/JGH
Youth has now fled. Their best years have been passed in the service
of the party. They are ageing and their ideals have also passed,
dispersed by the contrarities of daily struggles.