Hey Mark,

Just getting to this a few days after the fact.  I'm (slowly) packing up to move in July, so some of my side projects have had to take a 'back burner' as it were.

Those are some intriguing bits!  Two quick questions:

1. Was there a URL of a DAP specification that documents these?  How did you happen across them?
   
2. What OS's support them?  I guess from Johnny's list that RSX doesn't currently do so.  Perhaps only VMS, then?

--T

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On 6/2/23 10:38 AM, Mark Berryman wrote:

Continuing from bit 63 appears to be:

SEMANTICS.        ; 64 Supports semantics attributes extention message.
BINTIM            ; 65 Supports Binary Time formats
PACKETCHK         ; 66 Supports Packet level checksum
DDTM              ; 67 Supports Digital Distributed Transaction Processing
MSBRCW            ; 68 Supports Sequential MSB Variable Length Record Control Word
LENNAMBUF         ; 69 Supports LENNAMBUF field in ACCESS message

Mark Berryman

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On Jun 1, 2023, at 5:07 PM, Johnny Billquist <bqt@softjar.se> wrote:

.
.
.

Here is what is defined in RSX:


;
;       SYSCAP                  System Capabilities
;

.
.
.

; 9
CP$BIO'B'= 001                  ; 56 Block I/O Access modes *** V7.2
CP$BRO'B'= 002                  ; 57 Switching between Record and Block Access
CP$MFA'B'= 004                  ; 58 Storage of main file attributes
CP$BSZ'B'= 010                  ; 59 Non-8-bit aligned data
CP$SRF'B'= 020                  ; 60 Stream Record Format as default ASCII text
CP$IP1'B'= 040                  ; 61 Indexed file Prologue structure Version I
CP$IP2'B'= 100                  ; 62 Indexed file Prologue structure Version II
; 10
CP$IP3'B'= 001                  ; 63 Indexed file Prologue structure Version III
;CP$xx'B'= 002                  ; 64
;CP$xx'B'= 004                  ; 65
;CP$xx'B'= 010                  ; 66
;CP$xx'B'= 020                  ; 67
;CP$xx'B'= 040                  ; 68
;CP$xx'B'= 100                  ; 69
; 11
;CP$xx'B'= 001                  ; 70
;CP$xx'B'= 002                  ; 71
CP$XCP'B'= 004                  ; 72 Extended SYSCAP field (RESERVED)