While those datas may be compressed on the disk, on the RAM when program runs, it is still pretty typical use of a font : font are basically tiles, as CPC doesn't have text mode but only graphic mode, then some routine would read a text table and get those tiles to put on screen zone.
So You have to find the moment the game go get the letters in RAM, then go back in cycles to check where it takes the text datas, then you can know how it is done and where it is, may need to de-code and break/hack this text data thing... then check when game loads so you can know when and where it takes stuffs from disk into there. and so on...
yeah, the game uses 4 disks and 128K RAM I guess so it may be quite tricky indeed.
but hey, Rick dangerous, R-Type or DeathSword were done and patched this way... somewhat...
Please while at it, patch the game so it has Rasters and PLUS hardsprites... and some bits of graphics could use the CGA version graphics instead... oh wait...


