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@REPLYADDR Johnny Billquist <bqt@softjar.se>
@REPLYTO 2:5075/128 Johnny Billquist
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On 2023-09-28 18:43, Dave McGuire wrote:
> On 9/27/23 23:52, gah4 wrote:
>> Reminds me of another DEC disk, which can be used on either PDP-10 or
>> byte addressed machines. The controllers are different, and can only
>> write
>> blocks with the appropriate size, which I believe is 576 bytes for the
>> PDP-10,
>> and 512 otherwise. You can`t read disk packs on the other one.
>
> RM02/RM03. There`s a jumper on the backplane.
I`ve been reading the RM02/RM03 manuals, and I can`t find any
documentation on any backplane jumper for such a purpose. There are
jumpers for drive type and serial number, but that`s about it as far as
I can find.
By the way, it`s kind of strange to talk about different "controllers".
Of course they are different. The PDP-10 have a very different massbus
controller compared to a PDP-11 or a VAX. But they all talk massbus, and
the devices on the massbus itself is sortof agnostic to the machine word
size.
But the disk packs just have a different format depending on what they
are used for, and that formatting can be changed on a per-track basis.
The format is in the header for each sector.
Johnny
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