.set VIDMEM, 0x40000000

 mov r0, #0xff880000	; RGB value
 mov r1, #VIDMEM	; memory start
LOOP2:
 mov r2, #160*128	; word count
LOOP:
 str r0, [r1, r2, lsl #2]
 sub r2, r2, #1
 cmp r2, #0
 bge LOOP
 add r0, r0, #0xf002
 cmp r0, #0
 blt LOOP2
.ualong 0x11223344	; illegal instruction