Downtown Nekketsu Monogatari
----------------------------


The header is 4 bytes long.

first two bytes(word) = the number of uncompressed bytes

third byte = ???, push onto the stack, pulled back after # of uncompressed
byte reached. (Seems to de discarded afterwards - might be dependent on the
code that calls the decompression routine.)

fourth byte = nothing - skipped over by the decompression routine.




bit seven of the control byte:

1= block transfer from a previous data location of the destination block.
0= new data from the source to the destination block.

if bit=0, then the value is & $7F then incremented by 1. This is the number
of bytes to read/transfer from source to destination.


if bit=1, then a subtraction address is built:

bits 0-6 are stored into the MSB ZP variable.

a new byte is read from the source string.

bits 0-3 are added to 3 for the number of bytes to transfer.
bits 0-7 are stored into LSB ZP variable (bits 0-3 are shifted out, see below).

A 16bit right shift by 4 is performed on MSB/LSB, used to subtract from the
current pointer, and stored in a temp ZP location (source address pointing
within the build area).

That gives a sliding window of $800 bytes and a length of $12





$6084 bank $74 and $46884 in ISO is the string for the second set of fonts (bottom of
the screen text).