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Appendix D - Video Games
2. VIP Video Display Drawing Game
This program uses the CHIP-8 INTERPRETER at
0000-01FF. A flashing spot appears in the upper left
corner of the screen. You can move the spot by holding
key 2, 4, 6, or 8. Press key 5 and you can draw a picture
with the spot. Press key 0 and the spot can be moved
without drawing or used to erase a previously drawn
line. 0245-024E is a list of
41
initial values for VO-V9. In this program, locations
0300-03FF are used for the picture. After drawing a
picture, you can change M(0208) from OOEO to 120A.
Write locations 0000-03FF (4 pages) to tape to save your
picture. When you load these four pages back into
memory you will see your original picture. Changing the
OOEO instruction in the program to 120A prevents your
picture from being erased when the program is started.
0200 A245 I=0245
0202 F965 VO:V9=MI
0204 A24F I=024F
0206 0236 MLS@0236
0208 OOEO ERASE
020A F915 TIME-V9
020C FA07 VA=TIME
020E 3AOO SKIP;VA EQ 00
0210 120C GO 020C
0212 D121 SHOW 1MI@V1V2
0214 3FOO SKIP;VF EQ 00
0216 D121 SHOW 1MI@VIV2
0218 E3A1 SKIP;V3 NE KEY
021A 8030 VO=V3
021C E4AI SKIP;V4 NE KEY
O~U 8040 VO=V4
0220 4000 SK1P;VO NE 00
0222 123C GO 023C
0224 E5A1 SKIP;V5 NE KEY
0226 72FF V2+FF
0228 E6A1 SKIP;V6 NE KEY
022A 71FF V1+FF
022C E7AI S&IP;V7 NE KEY
022E 7101 V1+01
0230 E8A1 SKJP;V8 NE KEY
0232 7201 V2+01
0234 120A GO 020A
0236 OlF8
0238 03BB
023A E2D4
023C D121 SHOW 1MI@V1V2
023E 4FOO SKIP;VF NE 00
0240 D121 SHOW 1MI@V1V2
0242 1224 GO 0224
0244 0100
0246 0000
0248 0005
024A 0204
024C 0608
024E 0880