[Simh] PDP-10/RP06 Disk Image Size

[khandy21yo]

Bad blocks

-------- Original message --------
From Rob Doyle <radioengr at gmail.com> 
Date: 04/12/2015  11:07 PM  (GMT-07:00) 
To simh at trailing-edge.com 
Subject [Simh] PDP-10/RP06 Disk Image Size 
 
I'm designing an RH11 disk controller for my KS10 FPGA. I'd like to
use the SIMH data format for the media.

I noticed that an RP06 disk image from SIMH is 315,187,200 bytes.

Assuming an RP06 has 815 cylinders, 19 heads, 20 sectors (confirmed
in SIMH code) - I calculate that disk image should be 317,132,800
bytes.

If use 810 cylinders (instead of 815), I get the size of the of the
image file.

SIMH doesn't pack data: there are 128 words per sector and each
word occupies 64-bits or 8 bytes.  Therefore a sector is 1024 bytes.

What's am I missing?

Rob

--
KS10 FPGA Project at: http://www.techtravels.org/KS10FPGA/
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