fig-forth-6809 Wiki - fig-forth-6809

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I think the current branch is auto-hand-optimized.

I currently think the path I took to get here was sort of as follows:

1: hand-translated

(fig-forth_6809.asm -- an attempt to simply re-write with help)

2: search-and-replace

(fig6800to6809dumb.asm -- a least-work attempt, probably automatic)

(socialize6809.pl -- a script to convert to more modern syntax)

3: auto

(6800to6809.pl -- incomplete automatic translation script)

(figd6809.dsk -- color computer disk image used in testing and debugging)

4: auto-hand-optimized-offline -- see NEXT loop for clues

(fig-forth-auto6809.asm -- script output)

(fig-forth-auto6809halfopt.asm -- replacing sequences with single instructions)

(fig-forth-auto6809opt.asm -- native registers in use, parameter stack is U)

5: auto-hand-optimized-detour (lopped branch)

(figao.asm -- Trying to mix explicit inner loop with subroutine inner loop.)

6: auto-hand-optimized (current, JMP and JSR proceeding in parallel, in suspended animation)

fig-forth-auto6809.asm -> fig-forth-6809_jmp.asm -- Explicit NEXT loop, requires JMP/LBRA to NEXT

fig-forth-auto6809opt.asm -> fig-forth-6809_ret -- subroutine NEXT, RET comes back to NEXT

The files from the first three steps don't seem to be in my junkpiles. The files here are actually what existed about steps 3 to 5.

master has not yet been merged with the current branch, in no small part because I kept getting interrupted in the processes and am not complete confident what happened when.

The source files of most interest are fig-forth-6809_jmp.asm and fig-forth-6809_ret.asm.

fig-forth-auto6809.asm was renamed fig-forth-6809_jmp.asm, because definitions return to the inner interpreter via JMP NEXT (or BRA/LBRA NEXT).

fig-forth-auto6809opt.asm was renamed fig-forth-6809_ret.asm, because defnitions return to the inner interpreter via the RET instruction, allowing some leaf definitions to operate as simple subroutines.

Either is a (presently buggy) implementation of a fig Forth kernel, which should assemble to function on the TRS-80/Tandy Color Computer.

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