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.sect .rom
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! Stores the word in de to negative stack offset OFFSET.

#define PASTE(a, b) a ## b
#define LABEL(prefix, offset) PASTE(prefix, offset)

.define LABEL(.fstoren, OFFSET)
LABEL(.fstoren, OFFSET):
    #if OFFSET == 0
        #error "0 shouldn't happen"
    #elif OFFSET == 1
        mov l, c
        mov h, b
        mov m, d
        dcx h
        mov m, e
        ret
    #elif OFFSET == 2
        mov l, c
        mov h, b
        dcx h
        mov m, d
        dcx h
        mov m, e
        ret
    #else
        lxi h, -OFFSET
        dad b
        mov m, e
        inx h
        mov m, d
        ret
    #endif