Just for fun…

Here is a program that creates four 8×8 “sprites” that can be PUT on the screen. Each sprite represents the tank aimed in a different direction (up, down, left or right). For speed, they are only PUT on a byte boundary.

Use the arrow keys to move the tank around the screen.

The POKEs in line 180 reset the BASIC keyboard rollover table, which lets you hold down an arrow and the tank keeps moving.

Just for fun…

0 ' 
1 ' TANKPUT.BAS
2 ' ALLEN C. HUFFMAN
3 ' SUBETHASOFTWARE.COM
4 ' 2023-01-16
5'

10 ' LOAD SPRITES
20 DIM TU(1),TD(1),TL(1),TR(1),Z,L,V:GOSUB 2000

30 ' ARROW KEYS
40 KY$=CHR$(94)+CHR$(10)+CHR$(8)+CHR$(9)

50 ' 256X192 BLACK AND WHITE
60 PMODE 4,1:PCLS 1:SCREEN 1,1

70 ' TANK POSITION AND DIR.
80 TX=0:TY=0:TD=4:OX=0:OY=0

90 ' ERASE PREV POSITION
100 LINE(OX,OY)-(OX+7,OY+7),PSET,BF
110 ' PUT TANK ON SCREEN
120 ON TD GOTO 130,140,150,160
130 PUT(TX,TY)-(TX+7,TY+7),TU:GOTO 180
140 PUT(TX,TY)-(TX+7,TY+7),TD:GOTO 180
150 PUT(TX,TY)-(TX+7,TY+7),TL:GOTO 180
160 PUT(TX,TY)-(TX+7,TY+7),TR

170 ' READ KEYBOARD (WASD)
180 POKE&H155,&HFF:POKE&H156,&HFF:POKE&H157,&HFF:POKE&H158,&HFF
190 A$=INKEY$:IF A$="" THEN 190
200 LN=INSTR(KY$,A$):IF LN=0 THEN 180
210 OX=TX:OY=TY
220 ON LN GOTO 240,270,300,330

230 ' UP
240 TD=1:IF TY>0 THEN TY=TY-8:GOTO 100
250 GOTO 120
260 ' DOWN
270 TD=2:IF TY<184 THEN TY=TY+8:GOTO 100
280 GOTO 120
290 ' LEFT
300 TD=3:IF TX>0 THEN TX=TX-8:GOTO 100
310 GOTO 120
320 ' RIGHT
330 TD=4:IF TX<248 THEN TX=TX+8:GOTO 100
340 GOTO 120

999 GOTO 999

2000 ' LOAD SPRITE CHARACTERS
2010 PRINT "LOADING DATA";
2030 L=VARPTR(TU(0)):GOSUB 3000
2040 L=VARPTR(TD(0)):GOSUB 3000
2050 L=VARPTR(TL(0)):GOSUB 3000
2060 L=VARPTR(TR(0)):GOSUB 3000
2190 RETURN

3000 ' READ DATA AND POKE AT L
3010 PRINT ".";
3020 FOR Z=L TO L+7:READ V:POKE Z,(NOT V)+256:NEXT:RETURN
3030 ' 8X8 SPRITE CHARACTERS
3040 ' TANK UP
3050 DATA 24,24,219,255,255,255,255,195
3060 ' TANK DOWN
3070 DATA 195,255,255,255,255,219,24,24
3080 ' TANK LEFT
3090 DATA 63,63,30,254,254,30,63,63
3100 ' TANK RIGHT
3110 DATA 252,252,120,127,127,120,252,252

And here is one using 16×16 sprites:

10 ' 
20 ' TANKPUT16.BAS
30 ' ALLEN C. HUFFMAN
40 ' SUBETHASOFTWARE.COM
50 ' 2023-01-16
60'

70 ' LOAD SPRITES
80 DIM TU(6),TD(6),TL(6),TR(6),Z,L,V:GOSUB 2000

90 ' ARROW KEYS
100 KY$=CHR$(94)+CHR$(10)+CHR$(8)+CHR$(9)

110 ' 256X192 BLACK AND WHITE
120 PMODE 4,1:PCLS 1:SCREEN 1,1

130 ' TANK POSITION AND DIR.
140 TX=0:TY=0:TD=4:OX=0:OY=0

150 ' ERASE PREV POSITION
160 LINE(OX,OY)-(OX+15,OY+15),PSET,BF
170 ' PUT TANK ON SCREEN
180 ON TD GOTO 190,200,210,220
190 PUT(TX,TY)-(TX+15,TY+15),TU:GOTO 240
200 PUT(TX,TY)-(TX+15,TY+15),TD:GOTO 240
210 PUT(TX,TY)-(TX+15,TY+15),TL:GOTO 240
220 PUT(TX,TY)-(TX+15,TY+15),TR

230 ' READ KEYBOARD (WASD)
240 POKE&H155,&HFF:POKE&H156,&HFF:POKE&H157,&HFF:POKE&H158,&HFF
250 A$=INKEY$:IF A$="" THEN 250
260 LN=INSTR(KY$,A$):IF LN=0 THEN 240
270 OX=TX:OY=TY
280 ON LN GOTO 300,330,360,390

290 ' UP
300 TD=1:IF TY>0 THEN TY=TY-8:GOTO 160
310 GOTO 180
320 ' DOWN
330 TD=2:IF TY<176 THEN TY=TY+8:GOTO 160
340 GOTO 180
350 ' LEFT
360 TD=3:IF TX>0 THEN TX=TX-8:GOTO 160
370 GOTO 180
380 ' RIGHT
390 TD=4:IF TX<240 THEN TX=TX+8:GOTO 160
400 GOTO 180

2000 ' LOAD SPRITE CHARACTERS
2010 PRINT "LOADING DATA";
2020 L=VARPTR(TU(0)):GOSUB 3000
2030 L=VARPTR(TD(0)):GOSUB 3000
2040 L=VARPTR(TL(0)):GOSUB 3000
2050 L=VARPTR(TR(0)):GOSUB 3000
2060 RETURN
3000 ' READ DATA AND POKE AT L
3010 PRINT ".";
3020 FOR Z=L TO L+31:READ V:POKE Z,(NOT V)+256:NEXT:RETURN
3030 ' 8X8 SPRITE CHARACTERS
3040 ' TANK UP
3050 DATA 1,128
3060 DATA 1,128
3070 DATA 1,128
3080 DATA 1,128
3090 DATA 225,135
3100 DATA 255,255
3110 DATA 225,135
3120 DATA 227,199
3130 DATA 229,167
3140 DATA 229,167
3150 DATA 228,39
3160 DATA 228,39
3170 DATA 227,199
3180 DATA 224,7
3190 DATA 255,255
3200 DATA 224,7
3210 ' TANK DOWN
3220 DATA 224,7
3230 DATA 255,255
3240 DATA 224,7
3250 DATA 227,199
3260 DATA 228,39
3270 DATA 228,39
3280 DATA 229,167
3290 DATA 229,167
3300 DATA 227,199
3310 DATA 225,135
3320 DATA 255,255
3330 DATA 225,135
3340 DATA 1,128
3350 DATA 1,128
3360 DATA 1,128
3370 DATA 1,128
3380 ' TANK LEFT
3390 DATA 15,255
3400 DATA 15,255
3410 DATA 15,255
3420 DATA 4,2
3430 DATA 4,2
3440 DATA 4,242
3450 DATA 5,10
3460 DATA 255,202
3470 DATA 255,202
3480 DATA 5,10
3490 DATA 4,242
3500 DATA 4,2
3510 DATA 4,2
3520 DATA 15,255
3530 DATA 15,255
3540 DATA 15,255
3550 ' TANK RIGHT
3560 DATA 255,240
3570 DATA 255,240
3580 DATA 255,240
3590 DATA 64,32
3600 DATA 64,32
3610 DATA 79,32
3620 DATA 80,160
3630 DATA 83,255
3640 DATA 83,255
3650 DATA 80,160
3660 DATA 79,32
3670 DATA 64,32
3680 DATA 64,32
3690 DATA 255,240
3700 DATA 255,240
3710 DATA 255,240