24 Sep
2007
24 Sep
'07
2:08 p.m.
Tony Duell wrote:
Sorry for late reply...
Mine were wired as follows:
pin function
1 +5V
6 (PB0) Middle button
8 (PB1) Left button
10 (PB2) Right button
14 (PB4) Y1
16 (PB5) Y2
18 (PB6) X1
19 GND
20 (PB7) X2
Whereas the typical pinout for mice on a beeb seems to be one of:
pin Variant A Variant B
1 +5V +5V
2 (CB1) X1 X1
4 (CB2) Y1 Y1
5 GND GND
6 (PB0) X2 Left
8 (PB1) -- Middle
10 (PB2) Y2 Right
12 (PB3) -- X2
14 (PB4) -- Y2
16 (PB5) Left --
18 (PB6) Middle --
20 (PB7) Right --
... variant 'A' is the more common AMX/Quest/Acorn mouse pinout. So in the
case of my Depraz ones, yes the power signals were OK (as all odd pins > 5 are
GND on the User port IIRC), but the signals were all completely different
(pin-wise) to either of the two 'standards'.
I'm not aware of any Model B / Master software which came with a Depraz mouse
- presumably they were quite expensive critters too, implying that the
software was perhaps something high-end. Either that or they weren't tied to
anything specific, and just sold along with some programming information.
Yep, mine's the same... I'd originally assumed it was for an ACW (as according
to folklore their optional mouse was a P+G) but I'm not sure what the standard
mouse port was for an ACW with the mouse board (I've got an ACW here with the
mouse board fitted, but with no wiring to any socket on the rear panel) - I
should have a look at the service manual and your reverse-engineered data
sometime to see if that gives any clues...
Mine are both
that type (quadrature), but with the same connectors as found on
the BBC micro's User port. However, whilst they appeared originally to be
wired to conform to that port's pinouts (i.e. no TTL outputs shorted to ground
Do the power connections make sense? IIRC, the BBC micro user port has
one row that's 2 power and 8 grounds, the other row is port B of a VIA +
its control lines. They're
not particularly nice mice to use IMHO - but they are rather cool
compared to the boxy alternatives around that time (although I suppose my
Penny & Giles mouse dates from about the same time, and that one's far nicer
I think I have one of htpse Penny and Giles mice somewhere, and IIRC it
has a 20 pin IDC socket on the end which I presumed was for a BBC User
port... I have a very nice trackball from about the early
1980s. Not only does it
hacve the ball and 4 function buttons, but also 'arrow keys' that when
pressed generate the apporproate quadrature waveforms (as if you were
rolling the ball in that directuon), at a switch-selectable rate.
Nice. All I've got here are the bog-standard Acorn/Marconi ones (the RB2) -
although the Marconi one is still in its box and seems to have no hours on it,
judging by the fact the spindles haven't worn like they normally do!
cheers
Jules