7 Jan
2014
7 Jan
'14
6:18 a.m.
On Monday, January 6th, 2014, Jerome Fine wrote:
I assume that drive 0 was DS3 and drive 1 was DS4?
Please confirm.
I managed to make up the required circuits and LEDs for
a BA23
box with 2 hard drives and an RX50 (placed outside of the BA23,
but connected with long cables to the normal connectors) connected
to an RQDX2 via the standard distribution board adjacent to the
hard drive bays. I remember that lines 3 and line 4 on the 10 pin
cable supported the second hard drive. My first attempt jumpered
line 1 and line 3 along with line 2 and line 4 to allow the 4 button
panel to support both hard drives as long as they were BOTH in
WRITE PROTECT at the same time. The circuit I developed
much later needed two switches, two resistors and 4 LEDs.
On occasion when I need two hard drives in an BA23, I
disconnect
the 10 pin cable to the normal 4 button panel and connect that 10 pin
cable to my contraption.
I am curious, do you have the circuit needed to support
the second hard
drive? And did you have to cut any traces on the 4 button panel?
What I don't understand is why DEC did not make the information
easily available if you found it so easy to make supporting a second
hard drive possible. But back then, I guess DEC was DEC. It was
much more profitable selling an expansion BA23 box or better yet
a BA123 box.
Jerome Fine
I typically took the easy way out, and soldered two 1/4 watt resistors onto the 4-button
circuit board,
which ultimately strapped the 2nd hard drive as "Always ready" and "Write
Enabled".
T