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30d1329e L |
1 | \r |
2 | .z80\r | |
3 | \r | |
4 | ; Copyright (C), 1982\r | |
5 | ; Digital Research, Inc\r | |
6 | ; P.O. Box 579\r | |
7 | ; Pacific Grove, CA 93950\r | |
8 | \r | |
9 | ; This is the invariant portion of the modular BIOS and is\r | |
10 | ; distributed as source for informational purposes only.\r | |
11 | ; All desired modifications should be performed by\r | |
12 | ; adding or changing externally defined modules.\r | |
13 | ; This allows producing "standard" I/O modules that\r | |
14 | ; can be combined to support a particular system\r | |
15 | ; configuration.\r | |
16 | ;\r | |
17 | ; Modified for faster character I/O by Udo Munk\r | |
18 | \r | |
19 | cr equ 13\r | |
20 | lf equ 10\r | |
21 | bell equ 7\r | |
22 | ctlQ equ 'Q'-'@'\r | |
23 | ctlS equ 'S'-'@'\r | |
24 | \r | |
25 | cseg ; GENCPM puts CSEG stuff in common memory\r | |
26 | \r | |
27 | ; variables in system data page\r | |
28 | \r | |
29 | ;; extrn @covec,@civec,@aovec,@aivec,@lovec ; I/O redirection vectors\r | |
30 | \r | |
31 | ; user defined character I/O routines\r | |
32 | \r | |
33 | extrn ?ci,?co,?cist,?cost ; each take device in <B>\r | |
34 | extrn ?cinit ; (re)initialize device in <C>\r | |
35 | extrn @ctbl ; physical character device table\r | |
36 | \r | |
37 | \r | |
38 | include modebaud.inc ; define mode bits\r | |
39 | \r | |
40 | \r | |
41 | public @covec,@civec,@aovec,@aivec,@lovec ; I/O redirection vectors\r | |
42 | public ?const,?conin,?cono,?list,?auxo,?auxi\r | |
43 | public ?lists,?conos,?auxis,?auxos,?dvtbl,charini\r | |
44 | \r | |
45 | \r | |
46 | @CIVEC: dw 0 ; Console Input Redirection\r | |
47 | ; Vector (word, r/w)\r | |
48 | @COVEC: dw 0 ; Console Output Redirection\r | |
49 | ; Vector (word, r/w)\r | |
50 | @AIVEC: dw 0 ; Auxiliary Input Redirection\r | |
51 | ; Vector (word, r/w)\r | |
52 | @AOVEC: dw 0 ; Auxiliary Output Redirection\r | |
53 | ; Vector (word, r/w)\r | |
54 | @LOVEC: dw 0 ; List Output Redirection\r | |
55 | ; Vector (word, r/w)\r | |
56 | \r | |
57 | \r | |
58 | charini:\r | |
59 | \r | |
60 | ld c,15 ; initialize all 16 character devices\r | |
61 | c$init$loop:\r | |
62 | push bc\r | |
63 | call ?cinit\r | |
64 | pop bc\r | |
65 | dec c\r | |
66 | jp p,c$init$loop\r | |
67 | \r | |
8df5b655 | 68 | ; ld hl,1000000000000000b ; assign console to HOST\r |
2fe44122 | 69 | ld hl,0010000000000000b ; assign console to ASCI1\r |
30d1329e L |
70 | ld (@civec),hl\r |
71 | ld (@covec),hl\r | |
72 | ld hl,0000000000000000b ; assign auxiliary to nothing\r | |
73 | ld (@aivec),hl\r | |
74 | ld (@aovec),hl\r | |
75 | ld hl,0000000000000000b ; assign printer to nothing\r | |
76 | ld (@lovec),hl\r | |
77 | ret\r | |
78 | \r | |
79 | \r | |
80 | ; DEVTBL\r | |
81 | ; Return address of character device table\r | |
82 | \r | |
83 | ?dvtbl:\r | |
84 | devtbl:\r | |
85 | ld hl,@ctbl\r | |
86 | ret\r | |
87 | \r | |
88 | \r | |
89 | ; CONOUT\r | |
90 | ; Console Output. Send character in <C>\r | |
91 | ; to all selected devices\r | |
92 | \r | |
93 | ?cono:\r | |
94 | conout:\r | |
95 | ld hl,(@covec) ; fetch console output bit vector\r | |
96 | jr out$scan\r | |
97 | \r | |
98 | \r | |
99 | ; AUXOUT\r | |
100 | ; Auxiliary Output. Send character in <C>\r | |
101 | ; to all selected devices\r | |
102 | \r | |
103 | ?auxo:\r | |
104 | auxout:\r | |
105 | ld hl,(@aovec) ; fetch aux output bit vector\r | |
106 | jr out$scan\r | |
107 | \r | |
108 | \r | |
109 | ; LIST\r | |
110 | ; List Output. Send character in <C>\r | |
111 | ; to all selected devices.\r | |
112 | \r | |
113 | ?list:\r | |
114 | list:\r | |
115 | ld hl,(@lovec) ; fetch list output bit vector\r | |
116 | \r | |
117 | out$scan:\r | |
118 | ld b,0 ; start with device 0\r | |
119 | co$next:\r | |
120 | add hl,hl ; shift out next bit\r | |
121 | jr nc,not$out$device\r | |
122 | push hl ; save the vector\r | |
123 | push bc ; save the count and character\r | |
124 | call ?co ; if device selected, print it\r | |
125 | pop bc ; recover count and character\r | |
126 | pop hl ; recover the rest of the vector\r | |
127 | not$out$device:\r | |
128 | inc b ; next device number\r | |
129 | ld a,h\r | |
130 | or l ; see if any devices left\r | |
131 | jr nz,co$next ; and go find them...\r | |
132 | ret\r | |
133 | \r | |
134 | \r | |
135 | ; CONOST\r | |
136 | ; Console Output Status. Return true if\r | |
137 | ; all selected console output devices\r | |
138 | ; are ready.\r | |
139 | \r | |
140 | ?conos:\r | |
141 | conost:\r | |
142 | ld hl,(@covec) ; get console output bit vector\r | |
143 | jr ost$scan\r | |
144 | \r | |
145 | \r | |
146 | ; AUXOST\r | |
147 | ; Auxiliary Output Status. Return true if\r | |
148 | ; all selected auxiliary output devices\r | |
149 | ; are ready.\r | |
150 | \r | |
151 | ?auxos:\r | |
152 | auxost:\r | |
153 | ld hl,(@aovec) ; get aux output bit vector\r | |
154 | jr ost$scan\r | |
155 | \r | |
156 | \r | |
157 | ; LISTST\r | |
158 | ; List Output Status. Return true if\r | |
159 | ; all selected list output devices\r | |
160 | ; are ready.\r | |
161 | \r | |
162 | ?lists:\r | |
163 | listst:\r | |
164 | ld hl,(@lovec) ; get list output bit vector\r | |
165 | \r | |
166 | ost$scan:\r | |
167 | ld b,0 ; start with device 0\r | |
168 | cos$next:\r | |
169 | add hl,hl ; check next bit\r | |
170 | push hl ; save the vector\r | |
171 | push bc ; save the count\r | |
172 | ld a,0FFh ; assume device ready\r | |
173 | call c,coster ; check status for this device\r | |
174 | pop bc ; recover count\r | |
175 | pop hl ; recover bit vector\r | |
176 | or a ; see if device ready\r | |
177 | ret z ; if any not ready, return false\r | |
178 | inc b ; drop device number\r | |
179 | ld a,h\r | |
180 | or l ; see if any more selected devices\r | |
181 | jr nz,cos$next\r | |
182 | or 0FFh ; all selected were ready, return true\r | |
183 | ret\r | |
184 | \r | |
185 | coster: ; check for output device ready, including optional\r | |
186 | ; xon/xoff support\r | |
187 | ;\r | |
188 | ;TODO: interrupt driven devices should xon/xoff handle\r | |
189 | ; in isv\r | |
190 | \r | |
191 | ld l,b\r | |
192 | ld h,0 ; make device code 16 bits\r | |
193 | push hl ; save it in stack\r | |
194 | add hl,hl\r | |
195 | add hl,hl\r | |
196 | add hl,hl ; create offset into device characteristics tbl\r | |
197 | ld de,@ctbl+6\r | |
198 | add hl,de ; make address of mode byte\r | |
199 | ld a,(hl)\r | |
200 | and mb$xon$xoff\r | |
201 | pop hl ; recover console number in <HL>\r | |
202 | jp z,?cost ; not a xon device, go get output status direct\r | |
203 | ld de,xofflist\r | |
204 | add hl,de ; make pointer to proper xon/xoff flag\r | |
205 | call cist1 ; see if this keyboard has character\r | |
206 | ld a,(hl)\r | |
207 | call nz,ci1 ; get flag or read key if any\r | |
208 | cp ctlq\r | |
209 | jr nz,not$q ; if its a ctl-Q,\r | |
210 | ld a,0FFh ; set the flag ready\r | |
211 | not$q:\r | |
212 | cp ctls\r | |
213 | jr nz,not$s ; if its a ctl-S,\r | |
214 | ld a,00h ; clear the flag\r | |
215 | not$s:\r | |
216 | ld (hl),a ; save the flag\r | |
217 | call cost1 ; get the actual output status,\r | |
218 | and (hl) ; and mask with ctl-Q/ctl-S flag\r | |
219 | ret ; return this as the status\r | |
220 | \r | |
221 | cist1: ; get input status with <BC> and <HL> saved\r | |
222 | push bc\r | |
223 | push hl\r | |
224 | call ?cist\r | |
225 | pop hl\r | |
226 | pop bc\r | |
227 | or a\r | |
228 | ret\r | |
229 | \r | |
230 | cost1: ; get output status, saving <BC> & <HL>\r | |
231 | push bc\r | |
232 | push hl\r | |
233 | call ?cost\r | |
234 | pop hl\r | |
235 | pop bc\r | |
236 | or a\r | |
237 | ret\r | |
238 | \r | |
239 | ci1: ; get input, saving <BC> & <HL>\r | |
240 | push bc\r | |
241 | push hl\r | |
242 | call ?ci\r | |
243 | pop hl\r | |
244 | pop bc\r | |
245 | ret\r | |
246 | \r | |
247 | \r | |
248 | ; AUXIST\r | |
249 | ; Auxiliary Input Status. Return true if\r | |
250 | ; any selected auxiliary input device\r | |
251 | ; has an available character.\r | |
252 | ?auxis:\r | |
253 | auxist:\r | |
254 | ld hl,(@aivec) ; get aux input bit vector\r | |
255 | jr ist$scan\r | |
256 | \r | |
257 | \r | |
258 | ; CONST\r | |
259 | ; Console Input Status. Return true if\r | |
260 | ; any selected console input device\r | |
261 | ; has an available character.\r | |
262 | ?const:\r | |
263 | const:\r | |
264 | ld hl,(@civec) ; get console input bit vector\r | |
265 | \r | |
266 | \r | |
267 | ist$scan:\r | |
268 | ld b,0 ; start with device 0\r | |
269 | cis$next:\r | |
270 | add hl,hl ; check next bit\r | |
271 | ld a,0 ; assume device not ready\r | |
272 | call c,cist1 ; check status for this device\r | |
273 | or a\r | |
274 | ret nz ; if any ready, return true\r | |
275 | inc b ; next device number\r | |
276 | ld a,h\r | |
277 | or l ; see if any more selected devices\r | |
278 | jr nz,cis$next\r | |
279 | xor a ; all selected were not ready, return false\r | |
280 | ret\r | |
281 | \r | |
282 | \r | |
283 | ; AUXIN\r | |
284 | ; Auxiliary Input. Return character from first\r | |
285 | ; ready auxiliary input device.\r | |
286 | ?auxi:\r | |
287 | auxin:\r | |
288 | ld hl,(@aivec)\r | |
289 | jr in$scan\r | |
290 | \r | |
291 | \r | |
292 | ; CONIN\r | |
293 | ; Console Input. Return character from first\r | |
294 | ; ready console input device.\r | |
295 | ?conin:\r | |
296 | conin:\r | |
297 | ld hl,(@civec)\r | |
298 | \r | |
299 | in$scan:\r | |
300 | push hl ; save bit vector\r | |
301 | ld b,0\r | |
302 | ci$next:\r | |
303 | add hl,hl ; shift out next bit\r | |
304 | ld a,0 ; insure zero a (nonexistant device not ready).\r | |
305 | call c,cist1 ; see if the device has a character\r | |
306 | or a\r | |
307 | jr nz,ci$rdy ; this device has a character\r | |
308 | inc b ; else, next device\r | |
309 | ld a,h\r | |
310 | or l ; see if any more devices\r | |
311 | jr nz,ci$next ; go look at them\r | |
312 | pop hl ; recover bit vector\r | |
313 | jr in$scan ; loop til we find a character\r | |
314 | ci$rdy:\r | |
315 | pop hl ; discard extra stack\r | |
316 | jp ?ci\r | |
317 | \r | |
318 | \r | |
319 | \r | |
320 | xofflist:\r | |
321 | db -1,-1,-1,-1,-1,-1,-1,-1 ; ctl-s clears to zero\r | |
322 | db -1,-1,-1,-1,-1,-1,-1,-1\r | |
323 | \r | |
324 | \r | |
325 | end\r | |
326 | \r |