IBM 5170 : BIOS question - test-drb@ccmp.vtda.org

23 Jul 2014

Thanks to Jim, a world was opened for me. Using the original BIOS of my IBM
AT type1 motherboard that consists of 2 PROM each with 32KB I used BIOSUTIL
to add the geometry of my hard disk to position 15 (the 1st free position)
by recalculating the checksum with BIOSUTIL (this time understanding how it
works) . The difference between the original BIOS and the BIOS modified
compared with WinHex is as follows: 

Offsets: hexadec. 

&nbsp;

&nbsp;E4F1:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
00&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
68&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
0368h=872cylinders

&nbsp;E4F2:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
00&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 03

&nbsp;E4F3:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
00&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
10&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Head=16

&nbsp;E4F6:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
00&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; FF

&nbsp;E4F7:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
00&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; FF

&nbsp;E4FD:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
00&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
68&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0368h=872landing
zone

&nbsp;E4FE:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
00&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 03

&nbsp;E4FF:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
00&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
24&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 36 sector/track

&nbsp;FFFF:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
AD&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; A5

&nbsp;

9 difference (s) found. 

&nbsp;

The table with the disk&rsquo;s descriptions begins with disk 1 from E400
ending with the disc 47 to E6EF while from E4F1 to E4FF were inserted the
values &#8203;&#8203;of the new Hard Disk. BIOSUTIL has taken steps to
change just only the byte FFFF from AD (1010 0101) to A5 (1010 1101) so that
the checksum of the file with the modified bios is identical &nbsp;(?) to
the contents of the original file of the PROM. &nbsp;

&nbsp;

All to means: BIOSUTUL works fine with original IBM BIOS bun NOT with AMI
BIOS.

&nbsp;

The problem seems to be solved for the table discs, but as with the original
BIOS to power had always the same datas: date, time, type drive A, 512KB
DRAM, now all these values &#8203;&#8203;vary at each switch on (eg, the
base memory is to 0KB instead 512KB). 

&nbsp;

&nbsp;

How can I insert data into the BIOS for to have the correct ones stable for
final configuration of the machine that I have?

&nbsp;

Enrico

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