

The network software worked great! I hacked the standard diskROM of an MSX-computer and replaced all the low-level I/O routine by communication routines to an other computer. In this way you could use the diskdrives of an other computer via the joystick ports. Speeds were upto 1Kbyte/sec (I think?)

Cracked MSX-DOS 2.20 was because the orginial MSXDOS 2.20 cardridge had a memory-mapper system. I had a non-memory-mapped RAM-memory expesion cardridge and wanted to use that. For some silly reasone the 50Hz interrupt routines of MSXDOS 2.20 (counter to stop te drive motor after a while) was not on the same page as the rest of the software (the memorymapper was only used for that little routine and Japanese support, in which I was not interested). So I moved the interrupt routine to some empty space in the main-page. But it takes a LOT of time before you find out what the problem is..... (dissassembled most of the 16KB mainpage ROM....) Later I had a memory-mapper memory expension cardridge and all this was not necessary any more...

