15 Oct
2015
15 Oct
'15
10:58 a.m.
On Oct 15, 2015, at 1:37 PM, Josh Dersch <JoshD at
LivingComputerMuseum.org> wrote:
Does anyone have any idea what drive/system an 8-sector decpack would have been used
with? We have a few of them on our shelves at the LCM and I can't find any reference
that mentions 8-sector packs. (Just the usual 12 and 16-sector ones.)
They're clearly labeled "decpack 1100 BPI - 8" and the sector ring marks
out eight sectors. These are RK05 (IBM 2315) style packs.
Half density? I vaguely remember an RK05 style drive at half the density. RK02? Or am I
mixing it up with RP02 vs. RP03?
The peripherals handbook says that the RK05 recording density is about 2000 bpi, so 8
sectors would be 256 12-bit words at half density, i.e., half the sector slots of the
regular PDP8 pack.
paul