4 Jun
2011
4 Jun
'11
6:26 p.m.
On 04/06/2011 18:54, Tony Duell wrote:
I don't have the PCBs for each front panel for the BA23
(4 and 6 button) in front of me, but I would expect that
there are at least two significant differences:
It sounds like they are differnt PCBs. Darn :-(
You'd have to add them externally somehow, because the positions they
occupy (AFAIR) are taken up by the two illuminated switches for the
extra HDD.
I thought I had a spare 4-button panel but it turns out my spare is a
6-button, like all the ones on my BA23s here. However, that at least
made it easy to have a look at it. If it helps, the PCB number is
5016457, and it's labelled "BA23 FRONT PANEL" in the etch. It has five
jumpers on it, one 2-section DIL switch, and three ICs. W1...W4 are all
4-in-a-line molex pins, and all are jumpered pins 1-to-2 and 3-to-4;
each is to be connected to one of the four drive-related switches and
LEDs. I can't immediately see what W5 or the DIL switch do, and I'm
afraid I don't have time to trace it all out at the moment. I do wonder
if those jumpers change the routing to suit LEDs for an RX50. Certainly
if you removed the fifth and sixth switches, the LED connections would
be perfectly placed for LEDs centred in the cutouts in the front panel.
--
Pete Peter Turnbull
Network Manager
University of York
If you have
the information, can you describe the
circuits that were soldered and the size of the
resistors? In addition, would Tony (I guess this
is twice that I have taken your name in vain -
I apologize) be able to suggest the additional
circuits needed to add the green and orange
LEDs to show the same status that the 6 button
front panel for the BA23 shows?
Assumeing the circuits on Pete's web page are accurate, it should be
quite easy to do this.
Are the 4-button and 6-button panels base o nthe same PCB, with the
former being partially populated, or are they different PCBs?
(a) The lines (probably 5 and 6) from the 10 pin
cable
which control READY and READ ONLY on drive 2
are not handled at all on the 4 button panel
(b) The 4 button panel has 2 LEDs (in the same position
as the extra 2 switches on the 6 button panel) which
display READ ONLY for the floppy diskette on the
RX50 drives (detects when the WRITE PROTECT
sticky tab is placed on the media).
RIght...
If possible, it would also be "nice" to
have those 2 extra
LEDs for the floppy drives displayed on the 6 button
panel (or at least added somehow).
I assume that's possible too.