DDE28d RISC OS 6 compatibility.

Do we care whether the DDE runs on OS6 now, but the DDE sales page gives an expectation that it does. It nearly does, there are minor issues.

When !SetPaths in DDE28d is first seen on RISC OS 6.20 an “Unable to start transient utility (corrupt file – file has been truncated)” pops up. A little digging found this, Progm.AcornC/C++.Programming.Routines-1_48.!Routines.Resources.LocaleRes. with this header :-

00000000 : EA000004 : ...Í : B       &00000018
00000004 : 79766748 : Hgvy : LDMVCDB R6!,{R3,R6,R8-R10,R13,R14}^  ; *** ! and ^
00000008 : 216C6776 : vgl! : Undefined instruction
0000000C : 00000170 : p... : ANDEQ   R0,R0,R0,ROR R1
00000010 : 00000400 : .... : ANDEQ   R0,R0,R0,LSL #8
00000014 : 00000020 :  ... : ANDEQ   R0,R0,R0,LSR #32

The file length is only &170, so poking zero to offset &10 is a sufficient answer for the Utility to pass the header check.

The next issue is “Unable to start application (decompression failed)” errors. Two examples found so far are !Perl.Perl and Unix.chmod, they simply need manually ‘xpand’-ing. As far as I can see the ROL/ROOL squeeze incompatibility that previously existed is resolved, so these are old builds.