Routines |
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F800 | LD A,($7FFB) | Set bit 3 of ERIC's status flags at 7FFB, indicating that ERIC is being spoken to | ||||||
F803 | SET 3,A | |||||||
F805 | LD ($7FFB),A | |||||||
F808 | LD A,$FF | Adjust the MSB of the lesson clock so that the lesson will not end until the drama has played out | ||||||
F80A | LD ($7FF8),A | |||||||
Figure out which message the boy should deliver, depending on what MR ROCKITT and MR WACKER are up to.
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F80D | LD A,($A478) | Collect byte 0x78 of MR ROCKITT's buffer, which holds the MSB of the command list start address | ||||||
F810 | CP $FA | This is the MSB of FADB (command list 0xDE) | ||||||
F812 | LD BC,$FF00 | BC=FF00: 'Don't let ANGELFACE touch you...' | ||||||
F815 | JR Z,$F822 | Jump if MR ROCKITT is using command list 0xDE | ||||||
F817 | LD C,$35 | BC=FF35: 'EINSTEIN is going to tell MR WACKER...' | ||||||
F819 | LD A,($A375) | Collect byte 0x75 of MR WACKER's buffer, which holds the LSB of the address reached in the command list | ||||||
F81C | CP $3C | Is MR WACKER using command list 0xD8? | ||||||
F81E | JR C,$F822 | Jump if not (he must be using command list 0xD6) | ||||||
F820 | LD C,$8F | BC=FF8F: 'BOY WANDER has hidden a pea-shooter...' | ||||||
Now BC holds the address of the message to be delivered.
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F822 | CALL $7D26 | Make the little boy deliver his message | ||||||
F825 | LD L,$68 | Initialise the message repetition delay counter in byte 0x68 of the little boy's buffer to 40 | ||||||
F827 | LD (HL),$28 | |||||||
F829 | LD BC,$ECE0 | ECE0: 'Press 'U' if you understood' | ||||||
F82C | LD A,($7FCB) | Set bit 0 at 7FCB, indicating that the little boy is now waiting for acknowledgment from ERIC | ||||||
F82F | SET 0,A | |||||||
F831 | LD ($7FCB),A | |||||||
F834 | CALL $7D26 | Make the little boy say 'Press 'U' if you understood' | ||||||
F837 | LD A,($7FFB) | Collect ERIC's status flags from 7FFB | ||||||
F83A | BIT 3,A | Has 'U' been pressed yet? | ||||||
F83C | JR NZ,$F846 | Jump if not | ||||||
ERIC has acknowledged delivery of the message ('U' was pressed).
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F83E | LD A,$0C | Set the MSB of the lesson clock to 0x0C, giving enough time for the ensuing drama to play out | ||||||
F840 | LD ($7FF8),A | |||||||
F843 | JP $62A8 | Move to the next command in little boy no. 10's command list | ||||||
ERIC has not yet acknowledged delivery of the message ('U' has not been pressed).
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F846 | LD L,$68 | Decrement the message repetition delay counter in byte 0x68 of the little boy's buffer and return unless it has reached 0 | ||||||
F848 | DEC (HL) | |||||||
F849 | RET NZ | |||||||
F84A | LD A,($7FCB) | Reset bit 0 at 7FCB, indicating that the little boy is no longer waiting for acknowledgment from ERIC (because he's going to repeat the message first) | ||||||
F84D | RES 0,A | |||||||
F84F | LD ($7FCB),A | |||||||
F852 | JP $F808 | Deliver the message to ERIC once again |
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