Sprinter HD/DD switch

Greetings, All! I received a request to throw information into the echo about switching 1.44/720 on the Sprinter... For this, additional control lines of the internal COM port are used processor. SET_1440: LD A,5 OUT(1Bh),A LD A,0E0h OUT(1Bh),A RET SET_720: LD A,5 OUT(1Bh),A LD A,060h OUT(1Bh),A RET Switching to 1.44 puts the VG93 at 2MHz and doubles the circuit's input frequency PLL and write precompensation. There are no signals coming to or from the drive. You can determine which floppy disk is in the drive, either by trying to read the floppy disk in both cases, or by user selection (during formatting). After working with 1.44 disks, you should set the mode to 720 so that the VG93 is not in vain warmed up.. Wow! The Protoss are attacking my Zerlings! It's time to get going. Ivan. - Divorce the scheme, big and small...