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| Title: | Early Digital RISC architectures |
| Notice: | So early, we didn't *KNOW* they were RISCy! |
| Moderator: | ATLANT::SCHMIDT |
|
| Created: | Tue Feb 27 1990 |
| Last Modified: | Fri May 09 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 210 |
| Total number of notes: | 1350 |
209.0. "PDP-11 DECtape bit order" by CSTMSO::SUPNIK () Fri Mar 14 1997 16:11
If anyone has a TC11 manual, could they send me a copy?
I need to understand how a PDP-11 DECtape controller read and wrote
DECtapes, particularly those written on other machines. A DECtape
consists of 3 information tracks (redundantly written):
info 1/ bit<n> bit<n+3> ...
2/ bit<n+1> bit<n+4>
3/ bit<n+2> bit<n+5>
---> towards end of tape
On a 12b or an 18b PDP, the tape was written in big-endian order, with
bit<0> appearing at <n>, <1> at <n+1> and so on. What was the bit
order on a PDP-11?
This note is also cross posted to PDP_11.
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