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Used by the routines at PO_TV_2 and PO_MSG.
The routine at PO_MSG continues here.
This subroutine allows for characters to be printed 'recursively'. The appropriate registers are saved whilst PRINT_A_1 is called.
A Character code
PO_SAVE 0C3B PUSH DE Save the DE register pair.
0C3C EXX Save HL and BC.
0C3D RST $10 Print the single character.
0C3E EXX Restore HL and BC.
0C3F POP DE Restore DE.
0C40 RET Finished.
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