stand@bucket.UUCP (Stan Dolson) (05/22/87)
I own a AT&T 6300+ (PC-AT pseudo-compatible) that currently has a 20 Meg
disk running System V Unix. I think I may have found the perfect 40 Meg
external disk but I am not sure if it is compatible with my system. A
friend tells me that he knows of someone who is using the same drive in
an AT, but I wanted to check with you net-wizards out there first.
The drive is an ATASI Model #3046. Is this compatible with the 6300+?
What ROMs should I be using to use this drive? How do I find out if I
have the right ROMs? Will the internal controller take a 2nd hard disk?
What other specifics do I need to perform to get this drive to work??
Thanks in advance,
Stan Dolson
..!tektronix!reed!percival!bucket!stand
Rick's Home-grown Unix - Where We Do Things The Old-Fashioned Way
With High Voltage And Vacuum Tubesbill@ssbn.UUCP (Bill Kennedy) (05/24/87)
In article <355@bucket.UUCP> stand@bucket.UUCP (Stan Dolson) writes: > >I own a AT&T 6300+ (PC-AT pseudo-compatible) that currently has a 20 Meg >disk running System V Unix. I think I may have found the perfect 40 Meg >external disk but I am not sure if it is compatible with my system. A Be careful, there are only eight types of drives that can be put on a PLUS so if the drive is electrically *IDENTICAL* to one of these you're in good shape. The reason for eight drive types is that there are only three bits per unit to define the drive to the BIOS ROM. >The drive is an ATASI Model #3046. Is this compatible with the 6300+? See drive table below, if the 3046 is electrically identical (heads, cyls, etc.) then so much the better, else you're sunk. >What ROMs should I be using to use this drive? How do I find out if I >have the right ROMs? Will the internal controller take a 2nd hard disk? The latest rev of BIOS ROMs really only fixed some video and memory problems, I'm not aware of any changes for disk drives. Yes, the controller and the BIOS and Simultask will handle two drives. MS-DOS can't get to the second spindle but Simultask can. I have two ST4051's on my PLUS. >What other specifics do I need to perform to get this drive to work?? I have a write up on how to put one or more hard drives on the PLUS as well as how to set the switches for more than one memory board. I have offered to post this but no one seemed interested. I'll be glad to Email it to you if you decide to proceed. The following drives will work on the PC 6300 PLUS (Ref Hardware Reference Manual p 6-83) a drive with the same characteristics should too. Just because I cited the AT&T Manual, don't believe the switch and jumper settings, some of them are wrong. Generic 10M drives (e.g. Seagate ST 412) 306 cyl, 4 heads, no rwc or precomp Generic 20M drives (e.g. Seagate ST 225) 612 cyl, 4 heads, no rwc, cyl 256 CDC 30M Wren half high, 697 cyl, 5 heads, no rwc, no precomp CMI 20M CM6426, 640 cyl, 4 heads, rwc & precomp at 256 Tandon 40M 981 cyl, 5 heads, no rwc, precomp 0FFFF hex [sic] Seagate 40M ST 4051 <-full high, *NOT* the half high, 977 cyl, 5 heads, rwc at 0FFFF hex [sic], precomp at 500 Miniscribe 80M 6086, 1024 cyl, 8 heads, no rwc, precomp at 512 Micropolis 67M 1325, 1024 cyl, 8 heads, no rwc or precomp I have the low level format procedure and everything that you might need to do to make it all make sense & work. My PLUS, as I said, has 5Mb RAM and two 40Mb 4051's in it and I'm well pleased. -- Bill Kennedy {cbosgd | ihnp4!petro | sun!texsun!rrm}!ssbn!bill