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EF92: Call Sub-Message
Used by the routine at PrintMessage.
Control code 1F: read a new column and a sub-script id, then dispatch via SubMessageSelect.
CallSubMessage EF92 LD A,(HL) Set the column and left margin from the next script byte.
EF93 LD ($5BF7),A
EF96 LD ($5B00),A
EF99 INC HL
EF9A LD A,(HL) Fetch the sub-script id and stash the script pointer.
EF9B INC HL
EF9C PUSH HL
EF9D CALL SubMessageSelect Call SubMessageSelect and restore the script pointer.
EFA0 POP HL
EFA1 JP PrintMessage Jump to PrintMessage.
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