It just dawned on me, after re-re-re-re-reading JBH's posts that perhaps a better way, at least for now is to keep the block size the same as the GEMDDDS images I already have. Checking the Bios source, the CHK and ALL buffers are automatically adjusted to cater for the increased number of blocks as the EQU statements are calculated based on DSM which in turn is calculated from the the basic EQU statements at the top of the source.
Code:
DSM EQU (MAXSEC*SECSIZ/BLKSIZ)*(MAXTRK-1)-1
I am thinking that if I take this approach, I can simply make the disk images I have longer by adding empty (E5) sectors to the end of them. Not an original Gemini combination, but for now and as a learning exercise, it would be good.
Am I missing something?