3.6
Floppy Controller
The VP7 floppy controller is fully compatible with the PC8477, containing a superset of the
NEC µPD72065B and the N82077.
The following formats are supported:
Format
Disk Size
Disk Media
formatted Tracks
720 Kbyte
3.5
Double Density 96 tpi
80
1.44 Mbyte
3.5
High Density 135 tpi
80
The floppy controller uses various I/O addresses in the PC I/O address space. The table below
summarizes the standard floppy controller registers:
Address
Name
Function
$03F2
Digital Output Register
Write only
$03F4
Main Status Register
Read only
$03F5
Data Register
Read/Write
$03F7
Configuration Control Register
Write only
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