> On Dec 20, 2018, at 7:40 PM, David Gesswein <[email protected]> wrote:
>
> On Wed, Dec 19, 2018 at 02:31:47PM +0100, Pontus Pihlgren wrote:
>> Hi
>>
>> But it just seems to loop over DECtape I/O-instructions.
>>
>> Any suggestions to what I should be doing?
>>
> Reading the OS/8 handbook I think it is only intended to transfer files
> and doesn't support copying entire devices.
Doing that on PDP-11 would be straightforward, using the RALL (read all)
DECtape controller command. That's programmed I/O, not DMA. The DECtape
formatter uses that (or WALL, which uses the same programming approach). I
haven't seen any standard utilities that do this, though. The only thing that
comes close is RT-11 FILEX, but while that handles TOPS-10 tapes (file
structured, not raw) it doesn't do the 18-bit systems. It doesn't actually
matter much, but 16, 18, and 36 bit all use the same block size and block count
(256 16/18 bit words, 578 blocks) while 12 bit layout has an entirely different
block size and count. But with SMOP you can handle any of these, as indicated
by a compatibility table in the DECtape manual.
paul
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