scott@helium.UUCP (Scott Hazen Mueller) (10/22/87)
The 40M hard disk on my Compaq 386 is starting to feel a bit small, especially
as I'm considering making the system available for multiple users (under Unix+
DosMerge/386) in the forseeable future. Has anyone with a Compaq successfully
added a 3rd-party hard drive to it? Just to forestall the inevitable answers
from PC/AT people who've never been inside a Compaq - it doesn't appear to
have a standard (ST412?/506) controller and connectors. I know that Compaq
sells an upgrade; I also know that manufacturers tend to be the highest-cost
source of upgrades...
Thanks for any help. Please mail to me; if there is interest, I'll post
a summary.
\scott
--
Scott Hazen Mueller City of Turlock 901 S. Walnut Rd. Turlock CA 95380
(209) 668-5590 lll-crg!csustan!helium!scott uunet!zorch!helium!scottjamesa@amadeus.TEK.COM (James Akiyama) (10/23/87)
In article <225@helium.UUCP>, scott@helium.UUCP (Scott Hazen Mueller) writes: > The 40M hard disk on my Compaq 386 is starting to feel a bit small, especially > as I'm considering making the system available for multiple users (under Unix+ > DosMerge/386) in the forseeable future. Has anyone with a Compaq successfully > added a 3rd-party hard drive to it? Just to forestall the inevitable answers > from PC/AT people who've never been inside a Compaq - it doesn't appear to > have a standard (ST412?/506) controller and connectors. I know that Compaq > sells an upgrade; I also know that manufacturers tend to be the highest-cost > source of upgrades... > > Thanks for any help. Please mail to me; if there is interest, I'll post > a summary. > > \scott > -- > Scott Hazen Mueller City of Turlock 901 S. Walnut Rd. Turlock CA 95380 > (209) 668-5590 lll-crg!csustan!helium!scott uunet!zorch!helium!scott I'm not exactly sure what Compaq does on their 386 but I do have experience with their 286 machines. These include a 40-pin connector. Note that SCSI is 50-pins, while ST506 is 34-pins (plus a 20-pin). The 40-pin connector is actually a pseudo AT bus--Compaq builds the actual Winchester controller into the drive. The pinout for the connector is: PIN 1 -RESET PIN 2 GND PIN 3-18 +HOST DATA PIN 19 GND PIN 20 KEY (not used) PIN 21 RESERVED PIN 22 GND PIN 23 -HOST IOW PIN 24 GND PIN 25 -HOST IOR PIN 26 GND PIN 27 RESERVED PIN 28 +HOST ALE PIN 29 RESERVED PIN 30 GND PIN 31 +HOST IRQ14 PIN 32 -HOST IO16 PIN 33 +HOST ADDR 1 PIN 34 GND PIN 35 +HOST ADDR 0 PIN 36 +HOST ADDR 2 PIN 37 -HOST CS0 PIN 38 -HOST CS1 PIN 39 -HOST SLV/ACT PIN 40 GND Note that this pin configuration is used by several "AT" drive manufacturers including Conners Peripherals, and the Compaq modified Miniscribe drives. It is also available as a Western Digital WD1003-IDX (I think the numbers right) controller. Probably the best way to change drives is to get another Fixed Disk Controller (assuming you don't want to use Compaq). Western Digital makes a series of "AT" controller (they also manufacture IBM's controller); check the WD1003 series; WD1005; and WD1006 controllers. You can also look at Adaptec and others. Good luck! James Akiyama Tektronix, Inc.