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1 | title 'Character I/O Module for the Modular CP/M 3 BIOS'\r | |
2 | page 255\r | |
3 | .z80\r | |
4 | \r | |
5 | \r | |
6 | \r | |
7 | public ?cinit,?ci,?co,?cist,?cost\r | |
8 | public @ctbl\r | |
9 | \r | |
10 | \r | |
11 | extrn ff.init,ff.ist,ff.in,ff.ost,ff.out\r | |
12 | extrn as0init,as0ista,as0inp,as0osta,as0out\r | |
13 | extrn as1init,as1ista,as1inp,as1osta,as1out\r | |
14 | extrn _b0call\r | |
15 | \r | |
16 | include config.inc\r | |
17 | include z180reg.inc\r | |
18 | \r | |
19 | include modebaud.inc ; define mode bits and baud equates\r | |
20 | \r | |
21 | max$devices equ 3\r | |
22 | \r | |
23 | \r | |
24 | ;--------------------------------------------------------------\r | |
25 | ; Init character device\r | |
26 | ; c: device\r | |
27 | \r | |
28 | cseg\r | |
29 | ?cinit: ; init devices\r | |
30 | b0call _cinit\r | |
31 | ret\r | |
32 | \r | |
33 | dseg\r | |
34 | _cinit:\r | |
35 | ld b,c\r | |
36 | call vector$io\r | |
37 | dw ff.init\r | |
38 | dw as0init\r | |
39 | dw as1init\r | |
40 | dw rret\r | |
41 | \r | |
42 | \r | |
43 | ;--------------------------------------------------------------\r | |
44 | ; Character input\r | |
45 | ; b: device\r | |
46 | ; return:\r | |
47 | ; a: input char\r | |
48 | \r | |
49 | cseg\r | |
50 | ?ci: ; character input\r | |
51 | b0call _ci\r | |
52 | ret\r | |
53 | \r | |
54 | dseg\r | |
55 | _ci:\r | |
56 | call vector$io\r | |
57 | dw ff.in\r | |
58 | dw as0inp\r | |
59 | dw as1inp\r | |
60 | dw null$input\r | |
61 | \r | |
62 | ;--------------------------------------------------------------\r | |
63 | ; Input status\r | |
64 | ; b: device\r | |
65 | ; return:\r | |
66 | ; a: 0ffh if char available, else 0\r | |
67 | \r | |
68 | cseg\r | |
69 | ?cist: ; character input\r | |
70 | b0call _cist\r | |
71 | ret\r | |
72 | \r | |
73 | dseg\r | |
74 | _cist: ; character input status\r | |
75 | call vector$io\r | |
76 | dw ff.ist\r | |
77 | dw as0ista\r | |
78 | dw as1ista\r | |
79 | dw null$status\r | |
80 | \r | |
81 | ;--------------------------------------------------------------\r | |
82 | ; Character output\r | |
83 | ; b: device\r | |
84 | ; c: output char\r | |
85 | ; return:\r | |
86 | ; a: output char\r | |
87 | \r | |
88 | cseg\r | |
89 | ?co: ; character input\r | |
90 | b0call _co\r | |
91 | ret\r | |
92 | \r | |
93 | dseg\r | |
94 | _co: ; character output\r | |
95 | call vector$io\r | |
96 | dw ff.out\r | |
97 | dw as0out\r | |
98 | dw as1out\r | |
99 | dw rret\r | |
100 | \r | |
101 | \r | |
102 | ;--------------------------------------------------------------\r | |
103 | ; Output status\r | |
104 | ; b: device\r | |
105 | ; return:\r | |
106 | ; a: 0ffh if device ready for next output char, else 0\r | |
107 | \r | |
108 | \r | |
109 | cseg\r | |
110 | ?cost: ; character input\r | |
111 | b0call _cost\r | |
112 | ret\r | |
113 | \r | |
114 | dseg\r | |
115 | _cost: ; character output status\r | |
116 | call vector$io\r | |
117 | dw ff.ost\r | |
118 | dw as0osta\r | |
119 | dw as1osta\r | |
120 | dw ret$true\r | |
121 | \r | |
122 | ;--------------------------------------------------------------\r | |
123 | \r | |
124 | dseg\r | |
125 | vector$io:\r | |
126 | pop hl\r | |
127 | push de\r | |
128 | ld de,max$devices ; default if\r | |
129 | ld a,b ;\r | |
130 | cp e ; b > max$devices\r | |
131 | jr nc,exist\r | |
132 | ld e,a\r | |
133 | exist:\r | |
134 | add hl,de\r | |
135 | add hl,de\r | |
136 | \r | |
137 | ld e,(hl)\r | |
138 | inc hl\r | |
139 | ld d,(hl)\r | |
140 | ex de,hl\r | |
141 | pop de\r | |
142 | jp (hl)\r | |
143 | \r | |
144 | \r | |
145 | null$input:\r | |
146 | ld a,1Ah\r | |
147 | rret:\r | |
148 | ret\r | |
149 | ret$true:\r | |
150 | or 0FFh\r | |
151 | ret\r | |
152 | \r | |
153 | null$status:\r | |
154 | xor a\r | |
155 | ret\r | |
156 | \r | |
157 | ;--------------------------------------------------------------\r | |
158 | \r | |
159 | cseg\r | |
160 | @ctbl:\r | |
161 | db 'USB0 ' ; device 0\r | |
162 | db mb$in$out\r | |
163 | db baud$none\r | |
164 | \r | |
165 | db 'ASCI0 ' ; device 1\r | |
166 | db mb$in$out+mb$serial+mb$soft$baud\r | |
167 | db baud$19200\r | |
168 | \r | |
169 | db 'ASCI1 ' ; device 2\r | |
170 | db mb$in$out+mb$serial+mb$soft$baud\r | |
171 | db baud$19200\r | |
172 | \r | |
173 | db 0 ; table terminator\r | |
174 | \r | |
175 | \r | |
176 | end\r |