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84CB: Upload patterns
Used by the routine at start_screen.
Input
HL Pointer to start index and count
upload_patterns 84CB LD D,$00
84CD LD E,(HL) DE = start index
84CE INC HL
84CF LD C,(HL)
84D0 LD B,$00 BC = count
84D2 PUSH BC
84D3 POP IY IY = count
84D5 INC HL HL now points to graphics data
84D6 LD A,$03 Table code (3 = pattern generator table)
84D8 JP $1FBE PUT_VRAM
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