41C ROMs: LBL linkages

[RobertM]

(09-01-2019 04:42 AM)hth Wrote:  The global label links are the same as in RAM and they are fully deterministic in a ROM stored program.

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In other words, the link from the first global alpha should point to the preceding END (which was the .END. before COPY), and given the algorithm, its location is known and always the same relative to the copied program.

I think we are talking about different things. I don't believe the global links in ROM are deterministic from just the source...they depend on how they were copied from RAM when put into a ROM. What I mean by this is that just having the source to the printer ROM, I can not generate a ROM file that will match exactly the original printer ROM, because I can't know what values to use in the Cx yz positions for ANY first LBL after a two word UCODE intro. (Examples are the Cx yz values for PRPLOT in the printer ROM, or MK, LF, ML, or LB for the PPCL.ROM).

Also, as Ángel said, you can move these UCODE blocks around in the ROM (e.g. put some MCODE before one) without changing the Cx yz values in the first LBL and things still work.

Curious if you disagree and if so, how you can determine those values from just the source.