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                        The boot up process passes execution to the sector
                        which is read in. Thus, this code must be able to do
                        something intelligible.
                        Prior to DOS 4 or 5, the following definition was
                        documented but was not being checked by DOS.
                        Sometime around DOS 4 or 5, DOS started requiring
                        this:
                        Byte Value Description
                                0 EB Short jump opcode
                                1 any Distance of short jump
                                2 90 NOP or 0-2 E9 xx xx Jump instruction
                3-10 OEM Name
                        Anyone can write anything they want here.
                11-12 Bytes per sector
                13 Sectors per cluster (must be a power of 2; maximum = 128;
                real maximum = 64)
                14-15 Reserved sectors at beginning
                16 Number of File Allocation Tables
                17-18 Maximum number of Root Directory Entries
                19-20 Total sectors on media
                21 Media Descriptor
                          Bit Description
                          0 1 = 2 sided 0 = not 2 sided
                          1 1 = 8 sector 0 = not 8 sector
                          2 1 = removable 0 = not removable
                          3-7 reserved = 1
                          Value Description
                                  F8h Fixed disk
                                  F9h 5.25", double sided, 15 sectors/track
                                  FCh 5.25", single sided, 9 sectors/track
                                  FDh 5.25", double sided, 9 sectors/track
                                  FEh 5.25", single sided, 8 sectors/track
                                  FFh 5.25", double sided, 8 sectors/track
                                  FEh 8", single sided, 26 sectors/track
                                  FDh 8", double sided, 26 sectors/track
                                  FEh 8", double sided, 8 sectors/track
                                        Note: There are more notes on 8"
                                        diskettes, but I don't think
                                        they're that pertinent.
                22-23 Number of sectors used by a File Allocation Table
                24-25 Sectors per track
                26-27 Heads
                28-31 Hidden sectors
                32-35 Huge sectors
                36 Physical drive number
                37 Reserved
                38 Boot signature
                39-42 Serial number
                43-53 Volume label
                54-61 Filesystem type
                        Value Description
                        "FAT12 " 12 bit FAT (8 byte string, last 3 are 
paces)
                        "FAT16 " 16 bit FAT (8 byte string, last 3 are 
aces)
                62- Start of code
                          Usually where the code at 0 jumps to.
Appendix C
        Beep Codes
                A Beep Code is audible output from the machine intended to
                deliver information when no visible means are possible. Beep
                codes different, depending on the manufacturer.
        IBM POST Audio Error Codes:
                1 short beep All OK or Display error
                2 short beeps POST error - Error code on CRT, or Display 
rror
                No beep Power, motherboard
                Continuous beep Power, motherboard
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--- GEcho 1.20/Pro
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