csrobe@icase.edu (Charles S. [Chip] Roberson) (11/27/88)
I have a Compaq 386 with the following configuration:
80386 @ 16MHz
80387 @ 16MHz
1.0 Mb of memory
Base memory 640Kb
Add. Built-in User mem 256Kb
Compaq Reserved mem 128Kb
Extended Memory 0Kb
1 parallel interface LPT1
1 floppy (A:) 1.2 Mb (5 1/4")
1 Hercules Graphics Card Plus Monochrome Board
1 Async. Comm. interface COM1 at int 4
1 130Mb Fixed Disk Drive (C:) Type 25
The version of minix that I have boots with a 384Kb ram disk in extended
memory (/dev/ram) which contains / /bin /etc /tmp and loads from 1.2 Mb
diskettes.
I can boot minix to the following extent:
insert boot diskette
<CTL><ALT><DEL>
'=' menu screen appears
('f' = fsck on root diskette checks out disk Okay.)
boot root via '=' and start loading ram disk.
close to end (or perhaps at end) of loading ram disk I get:
Unexpected Trap: vector >= 16
pc = 0x688 text+data+bss = 0xBF40
Ok, now my questions:
1) Will James da Silva's lock fix (1062@killer.uucp) get me up and running?
2) Can I expect timing problems running @ 16MHz?
3) I would like to partition off 10Mb of the 130Mb disk for Minix. Is this
going to be a problem?
4) If I am going to have problems can anybody give me a reasonable estimate
of how much effort will be necessary to overcome them?
Please cc copies of your replies to me since I just (5 mins ago) requested
to be added to the info-minix mailing list.
Thanks,
-c
-------------------------------------------------------------------------
Chip Roberson ARPANET: csrobe@cs.wm.edu
1328-F Mt. Vernon Ave. BITNET: #csrobe@wmmvs.bitnet
Williamsburg, VA 23185 UUCP: ...!uunet!pyrdc!gmu90x!wmcs!csrobe
Finally: csrobe@icase.edu
-------------------------------------------------------------------------jds@mimsy.UUCP (James da Silva) (11/30/88)
In article <5675@louie.udel.EDU> csrobe@icase.edu (Charles S. [Chip] Roberson) writes: >I have a Compaq 386 with the following configuration: > > 80386 @ 16MHz > 80387 @ 16MHz > 1.0 Mb of memory > Base memory 640Kb > Add. Built-in User mem 256Kb > Compaq Reserved mem 128Kb > Extended Memory 0Kb > 1 parallel interface LPT1 > 1 floppy (A:) 1.2 Mb (5 1/4") > 1 Hercules Graphics Card Plus Monochrome Board > 1 Async. Comm. interface COM1 at int 4 > 1 130Mb Fixed Disk Drive (C:) Type 25 > >The version of minix that I have boots with a 384Kb ram disk in extended >memory (/dev/ram) which contains / /bin /etc /tmp and loads from 1.2 Mb >diskettes. >I can boot minix to the following extent: >... > boot root via '=' and start loading ram disk. > close to end (or perhaps at end) of loading ram disk I get: > Unexpected Trap: vector >= 16 > pc = 0x688 text+data+bss = 0xBF40 > According to your configuration above, you don't have any extended memory, but the 256K `Add. Built-in User mem' probably does start at the 1M line. Is it safe to say that the 128K `Compaq Reserved mem' is used to copy the BIOS into Ram for speed? I wonder how they map the copied BIOS memory to the rom addresses? I don't think they run the 386 in VM mode (but I'm not sure), so they probably have special hardware that lets the ram shadow the rom. (Anyone remember the Apple Language Card?). Anyway, I imagine that either Minix is being fooled into thinking you have 384k above the 1M line when you really only have 256k, OR, you really do, and Minix is happily zapping your BIOS whilst doing BIOS calls to copy the ram disk into extended memory. That would explain why it dies near the end; it works until it overwrites the BIOS code that handles the int 15h transfer-to-extended-memory code. Or maybe not, who knows?.... :-) >Ok, now my questions: > >1) Will James da Silva's lock fix (1062@killer.uucp) get me up and running? No. That fix was incorporated into Minix 1.2, so you already have it. >2) Can I expect timing problems running @ 16MHz? I didn't have any problems, but other people have reported timing problems with the floppy driver. >3) I would like to partition off 10Mb of the 130Mb disk for Minix. Is this > going to be a problem? Is your disk controller IBM PC/AT compatible? If it's an ESDI controller, you could have big problems. >4) If I am going to have problems can anybody give me a reasonable estimate > of how much effort will be necessary to overcome them? How much free time do you have? :-) Jaime ........................................................................... : domain: jds@mimsy.umd.edu James da Silva : path: uunet!mimsy!jds