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Used by the routines at SA_BYTES and LD_BYTES.
This subroutine is common to both saving and loading.
The border is set to its original colour and the BREAK key tested for a last time.
F Carry flag reset if there was a loading error
SA_LD_RET 053F PUSH AF Save the carry flag. (It is reset after a loading error.)
0540 LD A,($5C48) Fetch the original border colour from its system variable (BORDCR).
0543 AND $38
0545 RRCA Move the border colour to bits 2, 1 and 0.
0546 RRCA
0547 RRCA
0548 OUT ($FE),A Set the border to its original colour.
054A LD A,$7F Read the BREAK key for a last time.
054C IN A,($FE)
054E RRA
054F EI Enable the maskable interrupt.
0550 JR C,SA_LD_END Jump unless a break is to be made.
Report D - BREAK-CONT repeats.
0552 RST $08 Call the error handling routine.
0553 DEFB $0C
Continue here.
SA_LD_END 0554 POP AF Retrieve the carry flag.
0555 RET Return to the calling routine.
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