INT 15,3 - Write Blocks to Cassette (PC,PCjr only)
AH = 03
CX = count of bytes to write
ES:BX = pointer to data buffer
on return:
CX = zero
ES:BX = pointer to byte following last byte written
- data is actually written in 256 byte blocks
- if CX is less than 256, then the block is padded
- no error detection/correction is available for writing
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