General TC11 DECtape diagnostic/formatter questions
jnc at mercury.lcs.mit.edu
Thu Nov 10 06:42:33 CST 2016
> From: Christian Corti
> Seems the original must have been the XXDP TC11 DECtape formatter
> program by Robert J. Collins. I have no clue where I found the RT11
> version of this
So that made me wonder if the V6 Unix version of tcf.s really was related to
DTF.MAC. I checked out the two of them, and it seems they are likely
un-related; very different structure, etc.
BTW, I noticed a couple of places in DTF.MAC where error checking code was
commented out, e.g.:
;EHLT4: XX ;HALT WITH BLK#IN LIGHTS, CONTINUE
; MOV #257.,R0 ;TO FIND DATA WORD POSITION
; ADD TOG1,R0 ;DETERMINE WHICH WORD IS WRONG
;EHLT5: XX ;HALT WITH #OF WORD IN LIGHTS. 0=REV. CHKSUM
; MOV @TCDT,R0 ;CONTINUE TO FETCH BAD WORD
;EHLT6: XX ;HALT WITH BAD DATA IN LIGHTS. CONTINUE
Maybe it would be useful to un-comment them?
> On Nov 9, 2016, at 5:57 PM, Josh Dersch wrote:
> I believe S/B is the expected data
Yes, probably stands for 'should be'.
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