On 21 November 2013 15:58, Dave <[email protected]> wrote: > That is correct, the assembler that comes with MVS 3.8 is the IBM > Assembler XF, and this assembler was also supplied VM and DOS. This is a > complete re-write of the Assembler F which came with MVT. There is also > Assembler "G" which consists of modifications to Assembler F. I am not > sure when Assembler H appeared but thats the pre-cursor to the modern > HLASM.
Curiously enough, ASMH preceded Assembler XF by some years. It was resurrected much later (V2) mainly because XF was unable to process the hugely complex macros used for MVS/XA sysgen. Well, that's the external view; doubtless there were other IBM politics in play, as always. Tony H.
