Editing System Controller Firmware

= Structure (Header) =
{| class="wikitable sortable"
|-
! Offset !! Size !! Description !!  Notes
|-
| 0x0 || 1 || Header Index Magic || 01/02/10/20
|-
| 0x1 || 1 || Header Size || 0x10 / 0x18
|-
| 0x2 || 2 || Block Size || 00 00 or 04 00 or 08 00
|-
|}

<pre>
78K0R/Kx3: 0x800
78K0R/Kx3-L: 0x400
RL78/G13: 0x400
</pre>

= Structure (Header Content Index 0x01) =

{| class="wikitable sortable"
! Offset !! Size !! Description !!  Notes
|-
| 0x4 || 4 || Ernie Version || 05 05 03 01
|-
| 0x8 || 4 || Hardware Info || 38 50 80 00
|-
| 0xC || 4 || Padding || 00 00 00 00
|-
|}

= Structure (Header Content Index 0x02) =
{| class="wikitable sortable"
! Offset !! Size !! Description !!  Notes
|-
| 0x4 ||  4 || Unknown 1 || 00 00 00 00
|-
| 0x8 ||  4 || Encryption Type? || 02 00 00 00 for RL78 / 01 00 00 00 for 78K0R / 00 00 00 00 for 78K0R Proto (0.931 has this)
|-
| 0xC ||  4 || Padding || 00 00 00 00
|-
|}

* Encryption type 00 supported since at least 0.931 (0.902 doesn't support this) until 1.692
* Encryption type 01 supported since 1.00
* Encryption type 02 supported since 2.50

= Structure (Header Content Index 0x10) =
{| class="wikitable sortable"
! Offset !! Size !! Description !!  Notes
|-
| 0x4 ||  4 || Block Index || 00 00 00 00 / 01 00 00 00 / etc
|-
| 0x8 ||  4 || Block Size || 00 04 00 00 or 00 08 00 00
|-
| 0xC ||  4 || Padding || 00 00 00 00
|-
|}

<pre>
78K0R/Kx3: 0x800
78K0R/Kx3-L: 0x400
RL78/G13: 0x400
</pre>

= Structure (Footer) =
{| class="wikitable sortable"
! Offset !! Size !! Description !!  Notes
|-
| 0x0 ||  4 || Unknown || 20 18 00 00
|-
| 0x4 ||  0x14 || Sha-1 Hash of Decrypted Blocks Concatenated || 
|-
|}