Smoke tale
supervinx
repair it ...
Same old thing ... tantalium capacitor on +12V ...
Repaired, booted ...
512 Kb RAM (256 on board, 256 on original IBM expansion card), two
floppies, no HD ..
301 ... ah ... I forgot the keyboard ... :-(
Shutdown the big red switch ...
Meanwhile I was searching for the XT kbd ... the PSU smoked heavily ... I
had to open all the window ...
It's the first time a PSU dies when after it has been shutdown :-D
I'll open it later ...
I connected another AT PSU on the fly ... and I got an F6000 ROM error !
With debug, at F600:0 there is ... garbage ... a repetitive sequence 03
02 01 ...
Removed, cleaned, re-socketed ... nothing ...
Folks, have you ever happened that the ROM Bios chip died ?
I don't think it's a MB issue ...
I must try to read it elsewhere ...
I have an old 8088 clone that I use as 8 bit EPROM reader ... I install
the ROM in an unused Uxx slot and read it with debug ...
supervinx
not ROM bios ... ROM Basic ... ;-)
Horst Franke
> Sorry, I must be tired ...
> not ROM bios ... ROM Basic ... ;-)
Sorry supervinx
but this looks like the 5150 (w/o HD it's not a XT (5160))
did not find any OS and thus boots to ROM basic (F6000).
Did You have a bootable floppy inserted?
As Your PSU smoked this could have also damaged other
parts like the BIOS ROM.
Horst
supervinx
May be my english is not perfect ;-)
The PC wouldn't boot from ROM Basic if no OS was present (it booted
correctly from floppy), stopping with a F600 ROM error (and press F1).
The ROM BIOS chip is completely dead (it has been tested elsewhere).
AFAIK, XT 5160 could be configured with two floppies and no HD.
Yes, the PSU could have damaged the chip, even if it smoked well after it
was shut off.
More likely, it was already dead when my friend got the PC from a
recycler.
Russ Blakeman
added to a slot. One of mine has an MFM controller and ST225 20mb
(still runs like new), another has SCSI and one has an MFM controller
but the old Shugart is locked solid so I have to dig up my box of
ST225's and replace it. I did at one time have an ISA IDE controller
and had a smaller IDE HD on it but I sold that machine 2 or 3 yrs ago.
Main thing with the PC and XT class machines is that the controllers
have to contain their own BIOS addition as the onboard BIOS doesnt
support them. Even the old Sanyo MBC-555-2 I had in the mid or later
80's could have a HD, just had to have a special controller card for
it (no ISA slots on the Sanyo) then the HD had to be a half height
unless the drive controller supported an external drive in a power
supplied case. I ran a Fido BBS on it with 4 floppies (the controller
had A: through D: burned in, HD always booted to E and was a pain)
then later managed to trade some other gear for a controller and 5mb
HD to run it all on including DOS, the BBS, the mail section and file
downloads. Now the 5mb drive wouldnt hardly support anything. Serial
port was an add-on with the Sanyo so external modem only on it but
externals were the common thingh then.
On Mon, 02 Nov 2009 08:50:43 +0800, supervinx <supe...@libero.it>
wrote: