Hanging a 2nd disk off a 3b2-310?
rct at occrsh.ATT.COM
rct at occrsh.ATT.COM
Wed Jan 11 06:30:00 AEST 1989
Peter Fales mentioned a quick hardware hack to allow old 3B2/300 motherboards
(CM-190A, artmaster 5 and older) to handle up to 16 heads/drive. The "white
wire" should be run from pin 27 of the NEC7261 to pin 3 of the LS14, rather
than to pin 12 of the LS14 (third pin on the left, rather than the third pin
on the right). Here is a corrected sketch of the modification that I cribbed
from Peter's article:
I NOR AT&T CAN TAKE ANY RESPONSIBILITY FOR ANY DAMAGE TO YOUR SYSTEM
AS A RESULT OF ATTEMPTING THIS MODIFICATION.
My notes don't indicate what this chip
is (LS14 as mentioned earlier -- ed.),
but it is right next to the Hard
Disk controller chip in this physical
location.
|
|
v
+-----------------------------+
| --------- ------------- |
| | | | | |
+--|3 | | | | <--- NEC Hard Disk Controller Chip
| | | | | 1) Isolate Pin 23
| | | | | 2) Add Wire from pin 27 to pin 3
| | | | |
| | | | |
--------- | | |
| | |
| | |
| 27|--+
| |
| 23|--X
| |
-------------
Enjoy! I tried it out on an old AM5 motherboard and it DOES work!
--Bob Tracy AT&T Network & Data Systems Oklahoma City Works
att!occrsh!rct (405) 491-4577
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