Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 19h
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     The bootstrap routine reads Sector 1, Track 0 into memory at
     location 0000:7C00h and transfers control to the same address. If
     attempts to read a boot sector from the floppy disk or fixed disk
     are unsuccessful, control is transferred to ROM BASIC by execution
     of an Int 18h.
 
     If location 0000:0472h does not contain the value 1234h, a memory
     test will be performed before reading the boot sector.
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