anchor.diff:  
       zreqbuf c@ 3 = if
         zreqbuf @ 8 rshift              \ convert incoming request to offset
  -      dup 9 rshift sd-read            \ conv offset to block and read from SD
  +\     dup 9 rshift sd-read            \ conv offset to block and read from SD
  +      dup 9 rshift 0 file fat-read    \ conv block and read from file map 0
         $180 and sd.buf + DMA1-CMAR5 !  \ adjust src addr of DMA send channel
       then
   
  
positive.code: 
  compiletoram? [if]  forgetram  [then]
  
  include ex/sdtry.fs
  
  PC13 constant LED
  PA8 constant BUSY
  
negative.code:   ez80-8MHz ;
  
  : init-all
    sd-init ." blocks: " sd-size .
    cr sd-mount
    117 0 file fat-chain  \ build map for DISK3.IMG
    multitask disk&
    zdi-init led-setup
    zirq-setup dma-setup spi2-setup ;
  