ard at p850ug1.demon.co.uk
Wed Aug 10 17:16:23 CDT 2005
> page 1-1 of the RK11-C manual (RK11-C_manual1971.pdf)
> "The high-density option provides a choice of either
> the RK03 Diablo Disk Drive Unit or the RK05 DECpack
> Unit, both utilizing the RK03-KA, IBM Type 2315 12
> sector high-density disk cartridge. The low-density
> option provides a choice of either the RK02 Diablo
> Disk Drive Unit or the RK04 DECKpack Unit, both
> utilizing the RK02-KA IBM Type 2315 12-sector low
> density disk cartridge".
> low density is 12 256 byte sectors (1100 bpi)
> high density is 12 512 byte sectors (2200 bpi)
> both are 203 cyls, 2 tracks.
> I can't imagine there were many RK04's made..
And not all controllers supported them. The RK11-C has a bit of logic on
it to provide a half-freqeuncy clock for the RK02/RK04 mode (it's half
the bit densirt round the track). AFAIK the RK11-D doesn't.
The RK11-C would appear to support RK02, RK03, RK04, RK05 using 1-of-n
selects. The RK11-D would appear to be RK05 _only_ -- it requires a drive
that supports binary selects (which rules out the 02/03) and it doesn't
do low density.
I've never seen an RK04 or any manuals for it.
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