HDI

Description

Allows connecting of standard PC high-density drives.

Manufacturer: Erhard Puetz
Year: 1990

Picture

here (26 KB JPG)

Formats

Speeds

Commands

50 - Write sector
57 - Write sector with verify
52 - Read sector
21 - Format
53 - Get status
20 - Format auto
3F - Get high-speed index
41 - Add/Remove command
48 - Happy command
4E - Read PERCOM block
4F - Write PERCOM block
51 - Quit
54 - Read memory
68 - Get SIO length
69 - Get SIO routine
66 - Format with skew

Hardware

cpu 65C02, eprom 27C128, ram 62C256, riot 65c32, fdc WD37C65C, uart 71051.

Schematics

here (37 KB TIF).

Misc

The two switches are:
a) Selection of clock source (RIOT or Atari). By default Atari doesn't send clock
b) drive number switch