I have got the chance to buy a double set of C64 / 1541 drives. I bought this because i was searching specifically for the Mitsumi turn lever model.
In this package a C64 sporting a weird internal expansion board nr. 1184, made by CHB in 1984, was in the stack. I went fiddling around, soldering some connections and hooking it up and found three different ROM are added to the regular C64 kernal:
– DISK SPEEDLOADER | CRACKED BY FME | 84
– DISK TURBO – DALMAN PRODUCTS | 512KB RAM
Strangely enough on one of the eproms is written “VIDITEL $8000” makes me think that it is not a generic kernal switcher.