Prev: 16DB Up: Map Next: 1701
16E5: THE 'CLOSE #' COMMAND ROUTINE
The address of this routine is found in the parameter table.
This command allows the user to close streams. However for streams +00 to +03 the 'initial' stream data is restored and these streams cannot therefore be closed.
Input
Output
CLOSE 16E5 CALL STR_DATA The existing data for the stream is fetched.
16E8 CALL CLOSE_2 Check the code in that stream's channel.
16EB LD BC,$0000 Prepare to make the stream's data zero.
16EE LD DE,$A3E2 Prepare to identify the use of streams +00 to +03.
16F1 EX DE,HL
16F2 ADD HL,DE The carry flag will be set with streams +04 to +0F.
16F3 JR C,CLOSE_1 Jump forward with these streams; otherwise find the correct entry in the initial stream data table.
16F5 LD BC,$15D4
16F8 ADD HL,BC
16F9 LD C,(HL) Fetch the initial data for streams +00 to +03.
16FA INC HL
16FB LD B,(HL)
CLOSE_1 16FC EX DE,HL Now enter the data: either zero and zero, or the initial values.
16FD LD (HL),C
16FE INC HL
16FF LD (HL),B
1700 RET
Prev: 16DB Up: Map Next: 1701