*=$fe00

        sei
        cld
        lda #0
        sta $efd0       ; reset MMU control
        ldy #$0f
l1      tya
        sta $eff0,y
        dey
        bpl l1
        lda #$11        ; map video memory
        sta $eff8
        lda #%00011000
        sta $efe0       ; BIOS card control, unmap I/O at $d***
        jmp $fd16