/
keyboard.asm
247 lines (204 loc) · 3.47 KB
/
keyboard.asm
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
; contains routines for dealing with the keyboard; interrupt handler etc
normaltab:
; column a
.ascii '1' ; column a
.byte 0 ; left arrow
.byte 0 ; control
.byte 0 ; run/stop
.ascii ' '
.byte 0 ; commodore
.ascii 'q'
.ascii '2'
; column b
.ascii '3'
.ascii 'w'
.ascii 'a'
.byte 0 ; left shift
.ascii 'z'
.ascii 's'
.ascii 'e'
.ascii '4'
; column c
.ascii '5'
.ascii 'r'
.ascii 'd'
.ascii 'x'
.ascii 'c'
.ascii 'f'
.ascii 't'
.ascii '6'
; column d
.ascii '7'
.ascii 'y'
.ascii 'g'
.ascii 'v'
.ascii 'b'
.ascii 'h'
.ascii 'u'
.ascii '8'
; column e
.ascii '9'
.ascii 'i'
.ascii 'j'
.ascii 'n'
.ascii 'm'
.ascii 'k'
.ascii 'o'
.ascii '0'
; column f
.ascii '+'
.ascii 'p'
.ascii 'l'
.ascii ','
.ascii '.'
.ascii ':'
.ascii '@'
.ascii '-'
; column g
.byte 0
.ascii '*'
.ascii ';'
.ascii '/'
.byte 0 ; right shift
.ascii '='
.byte 0 ; home
.byte 0
; column h
.byte 0xff ; replaced: delete
.byte 0xff ; replaced: return
.byte 0 ; left/right
.byte 0 ; up/down
.byte 0 ; f1
.byte 0 ; f3
.byte 0 ; f5
.byte 0 ; f7
shifttab:
; column a
.ascii '!' ; column a
.byte 0 ; left arrow
.byte 0 ; control
.byte 0 ; run/stop
.ascii ' '
.byte 0 ; commodore
.ascii 'Q'
.ascii '"'
; column b
.ascii '#'
.ascii 'W'
.ascii 'A'
.byte 0 ; left shift
.ascii 'Z'
.ascii 'S'
.ascii 'E'
.ascii '$'
; column c
.ascii '%'
.ascii 'R'
.ascii 'D'
.ascii 'X'
.ascii 'C'
.ascii 'F'
.ascii 'T'
.ascii '&'
; column d
.ascii "'"
.ascii 'Y'
.ascii 'G'
.ascii 'V'
.ascii 'B'
.ascii 'H'
.ascii 'U'
.ascii '('
; column e
.ascii ')'
.ascii 'I'
.ascii 'J'
.ascii 'N'
.ascii 'M'
.ascii 'K'
.ascii 'O'
.byte 0
; column f
.byte 0
.ascii 'P'
.ascii 'L'
.ascii '<'
.ascii '>'
.ascii '{'
.byte 0
.byte 0
; column g
.byte 0
.byte 0
.ascii '}'
.ascii '?'
.byte 0 ; right shift
.byte 0
.byte 0 ; home
.byte 0
; column h
.byte 0xff ; replaced: delete
.byte 0xff ; replaced: return
.byte 0 ; left/right
.byte 0 ; up/down
.byte 0 ; f1
.byte 0 ; f3
.byte 0 ; f5
.byte 0 ; f7
keyhandler: lda PORTA6522
cmpa #0xff
beq keyhandlero
ldb keyrawmode
tstb
beq asciimode
ldx #keybuffer
bsr keypushbuf
keyhandlero: rts
asciimode: bita #0x80
beq keydown
clrb
bra keydownend
keydown: ldb #1
keydownend: anda #0x7f ; mask out the up/down; its in b
cmpa #0o13 ; left shift
beq asciilshift
cmpa #0o64 ; right shift
beq asciirshift
tstb ; key direction?
bne asciiconvert ; down, so convert it
rts ; otherwise we are done
asciilshift: stb asciilshifton
rts ; done in the keyboard handler
asciirshift: stb asciirshifton
rts ; done in the keyboard handler
asciiconvert: ldx #keybuffer
cmpa #0o71 ; return
beq asciireturn
cmpa #0o01 ; backspace
beq asciibacksp
tst asciilshifton
bne asciishifted
tst asciirshifton
bne asciishifted
ldx #normaltab
asciiconvertdo: lda a,x ; find ascii value
ldx #keybuffer
bsr keypushbuf
asciiconverto: rts
asciishifted: ldx #shifttab
bra asciiconvertdo
asciireturn: lda #CR
bsr keypushbuf
bra asciiconverto
asciibacksp: lda #BS
bsr keypushbuf
bra asciiconverto
; sub to push a into the keyboard buffer
keypushbuf: tsta ; don't fill nulls
beq keypushbufo
ldb keywritepointer
sta b,x
incb
andb #0x3f
stb keywritepointer
keypushbufo: rts