[TUHS] DEC RL01/RL02 RX01/RX02 Disk Image Creator

Adam Thornton athornton at gmail.com
Wed Jun 3 05:08:23 AEST 2020

> On Jun 2, 2020, at 11:59 AM, Paul Winalski <paul.winalski at gmail.com> wrote:
> On 6/2/20, Ronald Natalie <ron at ronnatalie.com> wrote:
>> Except on the RX’s.   The RX01 was 128 byte sectors and the later ones 256
>> and a odd interleaving strategy.    However, the boot block and the rest of
>> the file systems (both UNIX and RT at least)
>> just aggregated the smaller (logical) sectors together to make a 512 byte
>> one.
> At least they all supported fixed-length sectors.  Was there ever a
> Unix implementation that supported IBM-style CKD disk devices?

If you count Linux, sure, Linux for the S/390 and zSeries.

If you don’t…well, for one brief shining moment before IBM squeezed too hard on the price and Oracle bought Sun instead, there was an OpenSolaris port to the zSeries, and it did support 3390 type devices.

I may have had something to do with that latter device driver.


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