MCB structure copied from Ralf Brown's Interrupt List:
Format of DOS memory control block:Offset Size Description (Table 1314) 00h BYTE block type: 5Ah if last block in chain, otherwise 4Dh 01h WORD PSP segment of owner or special flag value 03h WORD size of memory block in paragraphs 05h 3 BYTEs unused by MS-DOS (386MAX) if locked-out block, region start/prev region end 08h 8 BYTEs DOS v4.0+ ASCII program name if PSP memory block or DR DOS UMB, else garbage null-terminated if less than 8 characters
for further informations get Ralf Brown's Interrupt List!
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