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1789: THE 'OPEN-P' SUBROUTINE
The address of this routine is derived from an offset found in the open stream lookup table.
Input
BC Length of the expression specifying the channel code
Output
OPEN_P 1789 LD E,$10 The data bytes will be +10 and +00.
This entry point is used by the routines at OPEN_K and OPEN_S.
OPEN_END 178B DEC BC Decrease the length of the expression and give an error if it was not a single character.
178C LD A,B
178D OR C
178E JR NZ,REPORT_F
1790 LD D,A Otherwise clear the D register, fetch HL and return.
1791 POP HL
1792 RET
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