IBM XT 5160 Technical Reference page 211

IBM Persona I Computer MACRO Assemb I er Vers i on 2.00
VIDEO ---- 01/10/86 VIDEO DISPLAY BIOS
1-3
01-10-86
INPUT
SET MODE
- TH I S ROUT I NE I NIT I ALI ZES THE ATTACHMENT TO
THE SELECTED MODE. THE SCREEN I S BLANKED.
"EQUIP FLAG BITS 5-4 = MODE/WIDTH
1 1-= MONOCHROME (FORCES MODE 7)
01 = COLOR ADAPTER 40 x 25 (MODE 0 DEFAULT)
10 = COLOR ADAPTER 80x25 (MODE 2 DEFAUL Tl
(AL) = COLOR MODE REQUESTED (RANGE 0 - 6 )
CHECK FOR VALID COLOR MODES 0-6
CONT I NUE I F BELOW MODE 7
FORCE DEFAULT 40x25 BW MODE
CHECK FOR "EQUIP FLAG AT 80x25 BW
CONTINUE WITH MODE 0 IF NOT
ELSE FORCE MODE 2
SA VE MODE I N GLOBAL V AR I ABLE
SAVE ADDRESS OF BASE
I NIT I ALI ZE DEFAULT ROW COUNT OF 25
SA VE PO I NTER TO DATA SEGMENT
SAVE MODE NUMBER (All
CLEAR HIGH BYTE OF MODE
SET TABLE PO INTER, I NDEXED BY MODE
GET THE MODE SET VALUE FROM TABLE
SAVE THE MODE SET VALUE
V IDEO OFF, SAVE HIGH RESOLUTI ON BI T
SAVE OUTPUT PORT VALUE
PO I NT TO CONTROL REG I STER
RESET V IDEO TO OFF TO SUPPRESS ROLLI NG
BACK TO BASE REG I STER
SET UP FOR ABSO SEGMENT
ES T ABL I SH VECTOR TABLE ADORES SING
GET PO I NTER TO V IDEO PARMS
RECOVER MODE NUMBER IN (AL)
LENGTH OF EACH ROW OF TABLE
DETERM I NE WH I CH ONE TO USE
MODE ISO OR 1
NEXT ROW OF I NIT I ALI ZAT I ON TABLE
SAVE WORK AND PARAMETER REG I STERS
PO I NT OS: TO OAT A SEGMENT
SAVE COMMAND/DATA INTO (SI) REGISTER
GET THE EQU I PMENT FLAG V IDEO BI TS
I SOLATE CRT SW ITCHES
IS SETT I NG FOR MONOCHROME CARD?
GET SEGMENT FOR COLOR CARD
SK I P I F NOT MONOCHROME CARD
ELSE GET SEGMENT FOR MONOCHROME CARD
ENTRY PO I NT FOR ORG OF065H
I NTERRUPTS BACK ON
SET 0 I RECT I ON FORWARD
TEST FOR WITHIN TABLE RANGE
BRANCH TO EX I T I F NOT A VAL I 0 COMMAND
; OUT INIT
; SAVE MODE IN (AL)
; GET THE CURSOR MODE FROM THE TABLE
; PUT CURSOR MODE I N CORRECT POS I TI ON
; SAVE TABLE SEGMENT PO INTER
PO I NT OS TO DATA SEGMENT
PLACE INTO BI OS DATA SAVE AREA
RESTORE THE TABLE SEGMENT POINTER
AH I S REG I STER NUMBER OUR I NG LOOP
; MODE I S 4, 5, OR 6
; MOVE TO BW CARD ROW OF INIT_TABLE
; MODE I S 2 OR 3
MOVE TO GRAPH I CS ROW OF I N IT_ TABLE
; COMMAND NOT VAL I 0
; DO NOTHING IF NOT IN VALID RANGE
AX
AX,[BX+l0J
AH,AL
OS
OS :DATA
DDS
"CURSOR MODE, AX
DS:CODE-
OS
AH,AH
"CRT MODE, AL
"ADDR 6845, OX
"ROWS~25-1
OS
AX
SI,AX
AL,CS: [SI + OFFSET M7]
"CRT MODE SET, AL
AL,037H -
OX
DX,4
DX,AL
OX
OS: ABSO
BX,BX
DS,BX
BX, "PARM PTR
DS:CODE -
AX
CX,16
AL,2
M9
BX,CX
AL,4
M9
BX,CX
AL,7
M9
BX,CX
AL,7
M8
AL,O
DI,20H
M8
AL,2
ENDP
AH,MIL/2
M4
ES
OS
OX
CX
BX
SI
01
BP
S I ,DATA
DS,SI
SI,AX
AL ,BYTE PTR "EQU I P FLAG
AL,30H -
AL,30H
DI,OB800H
M2
01 ,OBOOOH
PROC NEAR
PUSH
MOV
XCHG
PUSH
ASSUME
CALL
MOV
ASSUME
POP
XOR
LOOP THROUGH TABLE, OUTPUTTING REGISTER ADDRESS, THEN VALUE FROM TABLE
BX PO I NTS TO CORR,ECT ROW OF I N I TI ALI ZA TI ON TABLE
MOV
MOV
MOV
PUSH
PUSH
CBW
MOV
MOV
MOV
AND
PUSH
ADD
OUT
POP
ASSUME
SUB
MOV
LOS
ASSUME
POP
MOV
CMP
.1C
ADD
CMP
.1C
ADD
CMP
.1C
ADD
CMP
.1B
MOV
CMP
.1E
MOV
MOV ES,DI SET UP TO POINT AT VIDEO MEMORY AREAS
MOV AL , AH PLACE COMMAND I N LOW BYTE OF (AX)
CBW AND FORM BYTE OFFSET WITH COMMAND
SAL AX, 1 TIMES 2 FOR WORD TABLE LOOKUP
XCHG S I ,AX MOVE OFFSET I NTO LOOK UP REG I STER (S I )
AND RES TORE COMMAND / OAT A INTO (AX)
MOV AH , "CRT_MODE MOVE CURRENT MODE INTO (AH) REG I STER
.1MP WORD PTR CS:
[s
I +OFFSET M I ] ; GO TO SELECTED FUNCT I ON
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
MOV
MOV
MOV
MOV
AND
CMP
MOV
.1NE
MOV
M9:
M8:
M8C:
M4:
OUTPUT
NONE :
;~~
-
~~~~
-
--
-
- -
- -
;~~~
-
-
-
-
~~~~
--
-
--
-
---
-
--
-
------
-
----
-
- - --
- MOV OX, 03D4H ADDRESS OF COLOR CARD
MOV 0 I ,"EQU I P FLAG GET EQU I PMENT FLAGS SETT I NG
AND 0 I ,30H - I SOLATE CRT SW ITCHES
CMP 0 I ,30H IS BW CARD I NSTALLED AS PR I MARY
.1NE M8C SK I P AND CHECK I F COLOR
MOV AL,7 ELSE INDICATE INTERNAL BW CARD MODE
MOV DL,OB4H SET ADDRESS OF BW (MONOCHROME) CARD
.1MP SHORT M8 CONT I NUE WITH FORCED MODE 7
VIDEO 10 I
- STI
CLD
CMP
.1NB
M2:
229 0028
230 0028 FB
231 0029 FC
232 002A 80 FC
233 d02D. 73 2F
234
235 002F 06
236 0030 IE
237 0031 52
238 0032 51
239 0033 53
240 0034 56
241 0035 57
242 0036 55
243 0037 BE ---- R
244 003A 8E DE
245 003C 8B FO
246 003E AO 0010 R
247 0041 24 30
248 0043 3C 30
249 0045 BF B800
250 0048 75 03
251 004A BF BOOO
252 0040
253 0040 8E C7
254 004F 8A C4
255 0051 98
256 0052 OlEO
257 0054 96
258
259 0055 8A 26 0049 R
260
26 I 0059 2E: FF A4 0000 R
262
263 005E
264 005E CF
265 005F
266
267
268
269
270
271
272
273
274
275
276
277
278
279 005F
280 005F BA 0304
281 0062 8B 3E 0010 R
282 0066 81 E7 0030
283 006A 83 FF 30
284 0060 75 06
285 006F BO 07
286 0071 B2 B4
287 0073 EB 00
288 0075
289 0075 3C 07
290 0077 72 09
291 0079 BO 00
292 007B 83 FF 20
293 007E 74 02
294 008'0 BO 02
295 0082
296 0082 A2 0049 R
297 0085 89 16 0063 R
298 0089 C6 06 0084 R 18
299 008E 1E
300 008F 50
301 0090 98
302 0091 8B FO
303 0093 2E: 8A 84 0000 E
304 0098 A2 0065 R
305 009B 24 37
306 0090 52
307 009E 83 C2 04
308 OOA 1 EE
309 00A2 5A
310
31 I 00A3 2B DB
312 00A5 8E DB
313 00A7 C5 IE 0074 R
314
315 OOAB 58
316 OOAC B9 0010
317 OOAF 3C 02
318 OOBI 72 OE
319 00B3 03 09
320 00B5 3C 04
321 00B7 72 08
322 00B9 03 09
323 OOBB 3C 07
324 OOBD 72 02
325 OOBF 03 09
326
327
328
329 OOC 1
330 OOC 1 50
331 00C2 8B 47 OA
332 00C5 B6 EO
333 00C7 1E
334
335 00C8 E8 0000 E
336 OOCB A3 0060 R
337
338 OOCE 1F
339 OOCF 32 E4
340,
341
342
5-64 VIDEO (01/10/86)