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rs16550base = $de08
fifo_rxd = rs16550base+$00 ;8 (r)
fifo_txd = rs16550base+$00 ;8 (w)
fifo_dll = rs16550base+$00 ;8 (r/w)
fifo_dlm = rs16550base+$01 ;9 (r/w)
fifo_ier = rs16550base+$01 ;9
fifo_fcr = rs16550base+$02 ;a (w)
fifo_iir = rs16550base+$02 ;a (r)
fifo_lcr = rs16550base+$03 ;b
fifo_mcr = rs16550base+$04 ;c
fifo_lsr = rs16550base+$05 ;d
fifo_msr = rs16550base+$06 ;e (r)
fifo_scratch = rs16550base+$07 ;f (r/w)
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