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GW-BASIC | 1985-05-02 | 8.5 KB | 305 lines

10 REM ******************************************************************** 20 REM read and display sstv information by Niel Wiegand 30 REM ******************************************************************* 40 REM ******************************************************************* 50 REM Prologue 60 REM system requirements: 128k, colorgraphics board, cassette interface, 70 REM drive a 80 REM Change History 90 REM 3-1: Initial release level 100 REM 3-3: Changed routines to process audio from basic to machine language 110 REM Changed F7 to both input/store audio and process frame 120 REM 4-1: Added prologue section 130 REM 4-2: added routine to display period trace 140 REM added vertical sync 150 REM 4-3: CHANGED MENU TO WORK FROM ALPHA KEYS 160 REM ADDED HELP FUNCTION 170 REM ADDED PARAMETER SETTING FOR SSTVMLS 171 REM 5-0: changed saved frame dataset names to pictureX.pic 180 REM ****************************************************************** 190 REM **************************************************************** 200 REM set up function controls, load mls, and wait for command 210 REM ********************************************************************* 220 BLACK=749 230 GRAY1=703 240 GRAY2=657 250 GRAY3=611 260 GRAY4=565 270 DEF SEG=&H1F10 280 BLOAD "SSTVMLS.OBJ",0 290 DEF SEG 300 GOSUB 460 310 KEY OFF 320 COMMAND$=INPUT$(1) 330 IF COMMAND$=" " THEN GOTO 320 340 IF COMMAND$="P" OR COMMAND$="p" THEN GOSUB 2140 350 IF COMMAND$="M" OR COMMAND$="m" THEN GOSUB 460 360 IF COMMAND$="I" OR COMMAND$="i" THEN GOSUB 1350 370 IF COMMAND$="D" OR COMMAND$="d" THEN GOSUB 760 380 IF COMMAND$="S" OR COMMAND$="s" THEN GOSUB 810 390 IF COMMAND$="L" OR COMMAND$="l" THEN GOSUB 1050 400 IF COMMAND$="H" OR COMMAND$="h" THEN GOSUB 2300 410 IF COMMAND$="C" OR COMMAND$="c" THEN GOSUB 2810 420 GOTO 320 430 REM ********************************************************************* 440 REM display function menu 450 REM ********************************************************************* 460 GOSUB 1720 470 CLS 480 LIN = 99 490 PRINT 500 PRINT 510 PRINT 520 PRINT " SLOWSCAN TV MONITOR" 530 PRINT " VERSION 5.0" 540 PRINT 550 REM " BY NIEL WIEGAND" 560 PRINT " W B 5 Y T G" 570 REM " 911 NORTH BEND DR." 580 REM " AUSTIN, TX. 78758" 590 REM " (AC)512-837-2492" 591 PRINT" FREQ. USED FOR SSTV" 592 PRINT" 3.845 7.171 14.230" 593 PRINT" 21.340 28.680 MHz" 600 PRINT 610 PRINT 620 PRINT " KEY P: PERIOD TRACE DISPLAY" 630 PRINT " KEY M: MENU DISPLAY" 640 PRINT " KEY I: INPUT AND DISPLAY SSTV FRAME" 650 PRINT " KEY D: DISPLAY SSTV FRAME 660 PRINT " KEY S: SAVE SSTV FRAME (1-5) 670 PRINT " KEY L: LOAD SAVED SSTV FRAME (1-5) 680 PRINT " KEY C: CHANGE SSTV SCREEN PARAMETERS" 690 PRINT " KEY H: HELP AND INFORMATION FRAME" 700 PRINT 710 PRINT 720 RETURN 730 REM **************************************************************** 740 REM process and display sstv frame 750 REM **************************************************************** 760 RESTORE 770 GOTO 1780 780 REM **************************************************************** 790 REM save sstv frame 800 REM **************************************************************** 810 PRINT "frame number"; 820 INPUT FRAMENUM 830 IF FRAMENUM <1 THEN GOTO 890 840 IF FRAMENUM >5 THEN GOTO 890 850 DEF SEG=&HB800 860 ON FRAMENUM-1 GOTO 900,930,960,990 870 BSAVE "picture1.pic",0,&H4000 880 DEF SEG 890 RETURN 900 BSAVE"picture2.pic",0,&H4000 910 DEF SEG 920 RETURN 930 BSAVE"picture3.pic",0,&H4000 940 DEF SEG 950 RETURN 960 BSAVE"picture4.pic",0,&H4000 970 DEF SEG 980 RETURN 990 BSAVE"picture5.pic",0,&H4000 1000 DEF SEG 1010 RETURN 1020 REM **************************************************************** 1030 REM load sstv frame 1040 REM **************************************************************** 1050 PRINT "frame number"; 1060 INPUT FRAMENUM 1070 IF FRAMENUM <1 THEN GOTO 1050 1080 IF FRAMENUM >5 THEN GOTO 1050 1090 GOSUB 1570 1100 DEF SEG=&HB800 1110 ON FRAMENUM-1 GOTO 1150,1180,1210,1240 1120 BLOAD "picture1.pic",0 1130 DEF SEG 1140 RETURN 1150 BLOAD"picture2.pic",0 1160 DEF SEG 1170 RETURN 1180 BLOAD"picture3.pic",0 1190 DEF SEG 1200 RETURN 1210 BLOAD"picture4.pic",0 1220 DEF SEG 1230 RETURN 1240 BLOAD"picture5.pic",0 1250 DEF SEG 1260 RETURN 1270 REM ******************************************************************* 1280 REM exit monitor program with proper display mode 1290 REM ******************************************************************* 1300 GOSUB 1720 1310 END 1320 REM ****************************************************************** 1330 REM read and store audio data 1340 REM ****************************************************************** 1350 PRINT "WAITING FOR VERTICAL SYNC PULSE" 1360 DEF SEG=&H400 1370 X=PEEK(&H1A) 1380 POKE X,&H1C 1390 X=PEEK(&H1B) 1400 POKE X,&H1D 1410 DEF SEG=&H1F10 1420 MOTOR 1 1430 DEF USR3=6 1440 X=USR3(0) 1450 DEF USR0=0 1460 FOR I = 1 TO 300 1470 NEXT I 1480 PRINT "STORING SSTV AUDIO" 1490 X=USR0(0) 1500 MOTOR 0 1510 DEF SEG 1520 PRINT "SSTV frame stored" 1530 GOTO 1780 1540 REM ****************************************************************** 1550 REM set up screen for low resolution gray mode 1560 REM ****************************************************************** 1570 RESTORE 1580 CLS 1590 SCREEN 0,5 1600 OUT &H3D8,33 1610 DATA 113,80,85,10,127,6,100,112,02,01 1620 FOR I=0 TO 9 1630 READ REGINFO 1640 OUT &H3D4,I 1650 OUT &H3D5,REGINFO 1660 NEXT I 1670 OUT &H3D8,9 1680 RETURN 1690 REM ****************************************************************** 1700 REM restore normal alpha/num mode 1710 REM ****************************************************************** 1720 WIDTH 40 1730 SCREEN 0,0,0 1740 RETURN 1750 REM ********************************************************************* 1760 REM initialize variables and display 1770 REM ********************************************************************* 1780 GOSUB 1570 1790 DEF SEG=&H1F10 1800 POKE &H1A,125 'MAX RIGHT BORDER 1810 POKE &H1B,115 'MIN RIGHT BORDER 1820 POKE &H1D,25 'SYNC LIMIT 1830 POKE &H1E,6 'SYNC INCREMENT 1840 POKE &H1F,1 'NON-SYNC DECREMENT 1850 POKE &HC,182 'SYNC PERIOD MINUS 768 1860 POKE &H18,100 'NOISE PERIOD MINUS 256 1870 POKE &HE,(BLACK MOD 256) 1880 POKE &HF,(BLACK \ 256) 1890 POKE &H10,(GRAY1 MOD 256) 1900 POKE &H11,(GRAY1 \ 256) 1910 POKE &H12,(GRAY2 MOD 256) 1920 POKE &H13,(GRAY2 \ 256) 1930 POKE &H14,(GRAY3 MOD 256) 1940 POKE &H15,(GRAY3 \ 256) 1950 POKE &H16,(GRAY4 MOD 256) 1960 POKE &H17,(GRAY4 \ 256) 1970 DEF USR1=3 1980 X=USR1(0) 1990 DEF SEG 2000 RETURN 2010 REM ****************************************************************** 2020 REM load saved audio buffer 2030 REM ****************************************************************** 2040 REM this allows testing standard sstv data rather than using F7 to 2050 REM load the data from cassette tape. 2060 REM ****************************************************************** 2070 DEF SEG = &H1700 2080 BLOAD "audio.dat",0 2090 DEF SEG 2100 END 2110 REM ****************************************************************** 2120 REM display period trace 2130 REM ****************************************************************** 2140 CLS 2150 WIDTH 80 2160 SCREEN 2 2170 LOCATE 4,1 2180 PRINT"WHT" 2190 LOCATE 12,1 2200 PRINT "BLK" 2210 LOCATE 19,1 2220 PRINT "SYNC" 2230 DEF SEG=&H1F10 2240 DEF USR3=9 2250 MOTOR 1 2260 X=USR3(0) 2270 MOTOR 0 2280 DEF SEG 2290 RETURN 2300 GOSUB 1720 2310 CLS 2320 PRINT"PLOT PERIOD TRACE: AUDIO INPUT THROUGH" 2330 PRINT"THE CASSETTE INPUT PORT IS PLOTTED" 2340 PRINT"ON THE SCREEN. VERTICAL SCALE IS MARKED" 2350 PRINT"FOR APPROXIMATE PERIODS OF WHITE, BLACK" 2360 PRINT"AND SYNC. PLOTS 600 CYCLES THEN EXITS." 2370 PRINT 2380 PRINT"MENU DISPLAY: DISPLAY FUNCTION MENU." 2390 PRINT 2400 PRINT"INPUT AND DISPLAY SSTV: AUDIO INPUT" 2410 PRINT"THROUGH THE CASSETTE INPUT PORT IS" 2420 PRINT"USED TO GENERATE A SSTV FRAME IN THREE" 2430 PRINT"STEPS. FIRST WAIT FOR THE VERTICAL SYNC" 2440 PRINT"PULSE, THEN STORE AUDIO CYCLE PERIODS" 2450 PRINT"IN AUDIO BUFFER, THEN PROCESS AUDIO" 2460 PRINT"BUFFER TO FORM SSTV FRAME." 2470 PRINT 2480 PRINT"DISPLAY SSTV FRAME: AUDIO PREVIOUSLY" 2490 PRINT"INPUT AND STORED IN THE AUDIO BUFFER" 2500 PRINT"IS PROCESSED TO GENERATE A SSTV FRAME" 2510 PRINT 2520 PRINT"ENTER TO READ MORE 2530 COMMAND$=INPUT$(1) 2540 IF COMMAND$=" " THEN GOTO 2530 2550 PRINT 2560 PRINT"SAVE SSTV FRAME: SAVE THE DISPLAY" 2570 PRINT"BUFFER AS RAW BINARY DATA IN ONE OF" 2580 PRINT"FIVE DATASETS ON THE DISKETTE" 2590 PRINT"CURRENTLY LOADED ON DRIVE A." 2600 PRINT 2610 PRINT"LOAD SAVED SSTV FRAME: LOAD RAW BINARY" 2620 PRINT"DATA FROM ONE OF FIVE DATASETS ON THE" 2630 PRINT"DISKETTE CURRENTLY LOADED ON DRIVE A" 2640 PRINT"INTO THE DISPLAY BUFFER." 2650 PRINT 2660 PRINT"CHANGE SSTV SCREEN PARAMETERS: CONTRAST" 2670 PRINT"AND BRIGHTNESS OF THE PICTURE MAY BE" 2680 PRINT"ADJUSTED. NORMAL SETTINGS SET BOTH" 2690 PRINT"EVENLY. CONTRAST OF ZERO IS MOST" 2700 PRINT"CONTRASTY PICTURE. BRIGHTNESS OF 500" 2710 PRINT"IS DARKEST PICTURE." 2720 PRINT 2730 PRINT"ENTER TO RETURN TO MAIN MENU" 2740 COMMAND$=INPUT$(1) 2750 IF COMMAND$=" " THEN GOTO 2740 2760 GOSUB 460 2770 RETURN 2780 REM ******************************************************************** 2790 REM CHANGE PARAMETERS PASSED TO MACHINE LANGUAGE SUBROUTINE 2800 REM ******************************************************************* 2810 GOSUB 1720 2820 CLS 2830 PRINT "CURRENT BRIGHTNESS SETTING: "GRAY2 2840 PRINT "CURRENT CONTRAST SETTING: "CONTRAST 2850 PRINT 2860 PRINT "INPUT BRIGHTNESS SETTING FROM 500 TO" 2870 PRINT "800 (NORMALLY 657)"; 2880 INPUT" ", GRAY2 2890 GRAY2=INT(GRAY2) 2900 PRINT 2910 PRINT "INPUT CONTRAST SETTING FROM 0 TO 100" 2920 PRINT "(NORMALLY 46)"; 2930 INPUT" ", CONTRAST 2940 CONTRAST=INT(CONTRAST) 2950 GRAY1=GRAY2+CONTRAST 2960 BLACK=GRAY1+CONTRAST 2970 GRAY3=GRAY2-CONTRAST 2980 GRAY4=GRAY3-CONTRAST 2990 GOSUB 460 3000 RETURN