adapted to Kick Assembler, some documentation update

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FeralChild64 committed 2019-09-07 12:35:21 +02:00
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;;
;; Official Kernal routine, described in:
;;
;; - [RG64] C64 Programmer's Reference Guide - page 303
;; - [CM64] Compute's Mapping the Commodore 64 - page 224
;; - https://www.pagetable.com/?p=1031, , https://github.com/mist64/cbmbus_doc
;; - http://www.zimmers.net/anonftp/pub/cbm/programming/serial-bus.pdf
;;
;; CPU registers that has to be preserved (see [RG64]): .X, .Y
;;
//
// Official Kernal routine, described in:
//
// - [RG64] C64 Programmer's Reference Guide - page 303
// - [CM64] Compute's Mapping the Commodore 64 - page 224
// - https://www.pagetable.com/?p=1031, , https://github.com/mist64/cbmbus_doc
// - http://www.zimmers.net/anonftp/pub/cbm/programming/serial-bus.pdf
//
// CPU registers that has to be preserved (see [RG64]): .X, .Y
//
unlsn:
UNLSN:
;; According to serial-bus.pdf (page 15) this routine flushes the IEC out buffer
// According to serial-bus.pdf (page 15) this routine flushes the IEC out buffer
jsr iec_tx_flush
;; Buffer empty, send the command
// Buffer empty, send the command
lda #$3F
jmp common_open_close_unlsn_second