5 Jun
2011
5 Jun
'11
4:14 a.m.
Pete Turnbull wrote:
On 04/06/2011
18:54, Tony Duell wrote:
> 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?
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: (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. 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.
I have 2 spare 4 button BA23 front panels (the first number
specified is the PCB number on the non-component side):
(a) 5016457 with NO floppy diskette LEDs, but with
what looks like circuits ready for 2 more switches
5416458 also appears on the component side of
the etch just below the 20 pin header.
(b) 5015609 with floppy diskette LEDs at the same
location where the extra 2 switches are located
within the 6 button front panel for the BA23 box.
5015609-01E1P2 also appears on the component
side of the etch just below the 20 pin header.
I am also able to confirm that my 6 button BA23 front
panel has 5416458 on the component side of the etch.
I was not able to see the other side, but I am very
confident, based on the location of the components,
that 5016457 is on the other side.
Both PCBs are substantially different. Based on the
information that Pete provided and my own confirmation,
it seems quite certain that the PCBs have different
circuits.
As soon as possible, I will place an RQDX3 into the
backplane of the BA23 box with the 4 button BA23
front panel which has the 2 LEDs for displaying when
the floppy diskettes are READ ONLY. At present,
there is an RQDX1 and the LEDs function correctly.
When the RQDX3 is used instead, I will see if they
function as well and let you know.
Jerome Fine