On Fri, 29 May 2015, Rob Doyle wrote:
I was looking at the KS10 boot code in SIMH.
The boot code looks for the Primary Home Block in disk block 1 and Secondary
Home Block in disk block 8.
/* movei 2,10 ; blk #10 */
/* jsp 17,rdbl ; read */
/* movs 3,1000 ; id word */
/* caie 3,sixbit /HOM/ */
It looks to me like the Secondary Home Block is 10 (decimal)
not 10 (octal). I see it at offset 10240 (decimal) in the disk image.
2400/ HOM
2401/ USER0
2402/
2403/ ______
2404/ USER
I also see it at 2400 octal
Is the SIMH boot code correct?
I'm guessing that it never fails over to the secondary home block so
nobody ever noticed.
File: dskb:/u/p
[Patching structure DSKB]
200/ HRLI 17,0(15) $6T
201/ DSKB0
200/ HOM "/WOM/
201/ DSKB0 "/MUPPET/
203/ ^Z
% RPA0 first HOM block consistency error
Startup option:
Rob.
--
Cory Smelosky
http://gewt.net Personal stuff
http://gimme-sympathy.org Projects
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