RL02-USB Controller Status/Problem
pete at dunnington.plus.com
Tue Apr 7 12:21:55 CDT 2015
On 07/04/2015 16:25, Paul Koning wrote:
>> On Apr 7, 2015, at 8:41 AM, Pete Turnbull
>> <pete at dunnington.plus.com> wrote:
>> DEC does it by having the driver software remap sectors.
> No, DEC does not do that. At least not in RSX, as Johnny described,
> nor in RSTS.
I worded it poorly. The driver provides the data to remap blocks, but
doesn't necessarily use a replacement when it gets an error. As I wrote
elsewhere, there are two mechanisms: the files called FILE.BAD being
analogous to the file BADBLK.SYS in RSX, and the bad block substitution
table in the home block which is used when you perform normal file
operations - and which only exists for devices such as RL01/02 and
RK06/07, and is stored in the driver's memory-resident tables. I don't
know in detail how substitution happens, but in RT-11, it does.
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