lnxhdr.s

.import __BANK0BLOCKSIZE__
.import __BANK1BLOCKSIZE__
.export __EXEHDRUSR__: absolute = 1

.segment "EXEHDRUSR"

.byte    'L','Y','N','X'
.word    __BANK0BLOCKSIZE__
.word    __BANK1BLOCKSIZE__
.word    $X
.asciiz  "X"
.asciiz  "X"
.byte    $X
.byte    $X
.byte    %X
.byte    0, 0, $52

LNX ROM Header Fields - 64 Byte Header

Byte  0 -  3  | Char literal   | "LYNX"                      EEPROM byte-bits encode details of EEPROM used
      4 -  5  | 16-bit uchar   | Bank 0 page size            bit  1   2   3   4   5   6   7   8
      6 -  7  | 16-bit uchar   | Bank 1 page size                 |       |   |       |   |   |
      8 -  9  | 16-bit uchar   | Version number                   +---+---+   +---+---+   |  16/8 BIT
     10 - 41  | String + \0    | Cart name                            |           |     REAL/SD
     42 - 57  | String + \0    | Manufacturer                    EEPROM TYPE    UNUSED 
          58  | uchar          | Rotation (1=left, 2=right)
          59  | uchar          | AUDIN Used (1=yes)          Example: 0x40 (00000010) no-EEPROM, SD card saves
          60  | uchar          | EEPROM detail, see right    EEPROM Type values - 0: no EEPROM, 1: 93C46
     61 - 63  | uchar          | Unused                           2: 93C56, 3: 93C66, 4: 93C76, 5: 93C86
                                                             EEPROM size is 2^(type+9)
                                                                  e.g. 2^(1+9) = 1024 bits for 93C46
                                                             Lynx is little-endian so bit order is reversed.