Date   : Mon, 19 Dec 2005 19:59:22 GMT
From   : Wookie <wooky@...>
Subject: Re: Connecting a BBC Micro to a PC

In message <43A70A3D.8040500@...>
          Jules Richardson <julesrichardsonuk@...> wrote:

 
> Knowing me I may well have kept a couple "just in case" though. John K - do
> you have the pinouts of the 65Link cable handy? I suppose it'd make sense to 
> wire any Xfer-type ones the same way to avoid confusion. Presumably data
lines> go straight through and the 'modern' host is assumed to have a bi-directional

> port, but you use CB1 and CB2 as some sort of acknowledge lines too (in which 
> case which lines are you using for the RPC end of this?)

Cut & Pasted from the 65Link docs...


The parallel cable that connects the 6502's 'user port' and the ARM's parallel
port consists of a 'female 20 pin flatcable' connector (with notch), a 'male 25
pin D' plug, and a multi-wire, *SHIELDED* cable. The cable should be wired as
follows (pin numbers are marked on the D plug, pin 1 of the flatcable connector
is also marked, consult your manuals if in doubt) :

  ARM              <--->  6502

  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)

Connections marked with a * are not required, but they are recommended. In
addition to these connections, the shielding wire should be soldered to the
plug's metal on the ARM side (i.e. to the plug itself, not one of its pins),
and left unconnected on the 6502 side (but insulate it, so it can't short
against other wires !).


Cheers Wookie.

-- 
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