0 IFA=0THENA=1:LOAD"+SEQ",8,1
1 IFA=1GOTO10
2 IFA=2THENA=3:LOAD"+MASK",8,1
3 IFA=3THENSYS4096
10 FORI=1TO5:POKE999+I,ASC(MID$("MASK_",I,1)):NEXT
20 SYS49152
30 A=2:GOTO2