diff options
Diffstat (limited to 'read.s')
| -rw-r--r-- | read.s | 108 |
1 files changed, 56 insertions, 52 deletions
@@ -1,66 +1,70 @@ read: -002000 012704 MOV #7000, R4 ; move read buffer address into R4 +002000 012704 MOV #7000, R4 ; move read buffer address into R4 002002 007000 -002004 105024 CLRB (R4)+ ; move null byte into buffer +002004 105024 CLRB (R4)+ ; move null byte into buffer get: 002006 032737 BIT #200, @#177560 002010 000200 002012 177560 -002014 001774 BEQ get ; loop until char ready -002016 113701 MOVB @#177562, R1 +002014 001774 BEQ get ; loop until char ready +002016 113701 MOVB @#177562, R1 ; get the char 002020 177562 -002022 120127 CMPB R1, "\r" ; done if enter was pressed -002024 000015 -002026 001430 BEQ done -002030 120127 CMPB R1, " " ; good if space -002032 000040 -002034 001414 BEQ good -002036 120127 CMPB R1, "(" ; good if left paren -002040 000050 -002042 001411 BEQ good -002044 120127 CMPB R1, ")" ; good if right paren -002046 000051 -002050 001406 BEQ good -002052 120127 CMPB R1, "A" ; bad if lower than A -002054 000101 -002056 103413 BLO bad -002060 120127 CMPB R1, "Z" ; bad if higher than Z -002062 000132 -002064 101010 BHI bad +002022 120127 CMPB R1, "DEL" ; delete char if backspace was pressed +002024 000177 +002026 001004 BNE not_backspace +002030 005304 DEC R4 ; decrement buffer pointer +002032 004737 JSR PC, @backspace ; send backspace char +002034 002144 +002036 000763 BR get ; keep getting chars +not_backspace: +002040 120127 CMPB R1, "\r" ; done if enter was pressed +002042 000015 +002044 001424 BEQ done +002046 120127 CMPB R1, " " ; good if space +002050 000040 +002052 001414 BEQ good +002054 120127 CMPB R1, "(" ; good if left paren +002056 000050 +002060 001411 BEQ good +002062 120127 CMPB R1, ")" ; good if right paren +002064 000051 +002066 001406 BEQ good +002070 120127 CMPB R1, "A" ; bad if lower than A +002072 000101 +002074 103407 BLO bad +002076 120127 CMPB R1, "Z" ; bad if higher than Z +002100 000132 +002102 101004 BHI bad good: -002066 110124 MOVB R1, (R4)+ ; move good char into buffer -echo: -; echo good char -002070 032737 BIT #200, @#177654 -002072 000200 -002074 177564 -002076 001774 BEQ echo -002100 110137 MOVB R1, @#177566 -002102 177566 -002104 000740 BR get ; keep getting chars +002104 110124 MOVB R1, (R4)+ ; move good char into buffer +002106 004737 JSR PC, @print_char ; echo good char +002110 002150 +002112 000735 BR get ; keep getting chars bad: -002106 000737 BR get ; ignore bad chars +002114 000734 BR get ; ignore bad chars done: -; send carriage return -002110 032737 BIT #200, @#177654 -002112 000200 -002114 177564 -002116 001774 BEQ done -002120 112737 MOV "\r", @#177566 -002122 000015 -002124 177566 -; send line feed -line: -002126 032737 BIT #200, @#177654 -002130 000200 -002132 177564 -002134 001774 BEQ line -002136 112737 MOV "\n", @#177566 -002140 000012 -002142 177566 -002144 000137 JMP #parse_sexp -002146 002200 +002116 112701 MOVB "\r", R1 ; send carriage return +002120 000015 +002122 004737 JSR PC, @print_char +002124 002150 +002126 112701 MOVB "\n", R1 ; send line feed +002130 000012 +002132 004737 JSR PC, @print_char +002134 002150 +002136 000137 JMP @parse_sexp +002140 002200 +backspace: +002144 112701 MOVB "\b", R1 +002146 000010 +print_char: +002150 032737 BIT #200, @#177654 +002152 000200 +002154 177564 +002156 001774 BEQ print_char +002160 110137 MOVB R1, @#177566 +002162 177566 +002164 000207 RTS PC ; R3 = sexps parse_sexp: |