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Each RAM device is tagged at address $000000 with $A55A followed by a byte with the size of RAM device (size in banks).
$000000 : $5A $A5 $01 for a 32K internal RAM
$000000 : $5A $A5 $1F for a 512K internal RAMCR_TAG ($0000) with CT_RAM ($A55A) followed by the size in banks (1 byte).
The RAM device DOR is by by default at $0040.
For information, the first page of :RAM.0 contains other root DORs (RAM.- and APPL).
Device | Address | Content | Width | Value |
|---|---|---|---|---|
:RAM.0 | $210000 | Tag + Size | 3 | CT_RAM followed by size in banks |
$210020 | RAM.- DOR | 20 | :RAM.- root DOR | |
$210040 | RAM.0 DOR | 20 | :RAM.0 root DOR | |
$210060 | APPL DOR | 20 | :APPL root DOR | |
:RAM.0 | $210000 | Tag + Size | 3 | CT_RAM followed by size in banks |
:RAM.0 | $210000 | Tag + Size | 3 | CT_RAM followed by size in banks |
:RAM.0 | $210000 | Tag + Size | 3 | CT_RAM followed by size in banks |
File DOR
The file DOR length is up to 64 bytes. Its layout is fixed and should respect the specified order. It contains father, brother and son followed by file informations consisting of a key, data length, data.
Offset | Length | Name | Value | Description |
|---|---|---|---|---|
$00 | 3 | pointer to father | ||
$03 | 3 | pointer to brother | ||
$06 | 3 | pointer to son | ||
$09 | 1 | DN_ | DOR minor type (DN_Fil, DN_Dir, DN_Epr) | |
$0A | 1 | $3F | file DOR length | |
$0B | 1 | DT_NAM | 'N' | name section descriptor |
$0C | 1 | $11 | filename length, fixed value | |
$0D | 17 | filename null terminated, cell filled with trailing zero. Includes dot and extension. | ||
$1E | 1 | DT_UPD | 'U' | update timestamp section descriptor |
$1F | 1 | $06 | update time length, fixed value | |
$20 | 6 | date and time of update in machine format | ||
$26 | 1 | DT_CRE | 'C' | creation timestamp section descriptor |
$27 | 1 | $06 | creation time length, fixed value | |
$28 | 6 | date and time of creation in machine format | ||
$2E | 1 | DT_EXT | 'X' | extent (size) |
$2F | 1 | $04 | extent length, fixed value | |
$30 | 4 | 32 bit value of filesize | ||
$34 | 1 | DT_EFS | 'E' | section descriptor |
$35 | 1 | $04 | section length, fixed value | |
$36 | 4 | 32 bit pointer to eprom file entry | ||
$3A | 1 | DT_ATR | 'A' | section descriptor |
$3B | 1 | $03 | section length, fixed value | |
$3C | 3 | 24 bit for file attribute flags |
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