Instruction manual

Appendix B Genesis MP74 ◆
CD ROM Drive
Genesis MP has CD-ROM drive, that supports worldwide stan-
dards and specifications for CD-ROM and CD-digital audio discs.
This drive can read CD-ROM, CD-XA, CD-I, PhotoCD Discs, and
Standard CD Audio Discs
The CD-ROM drive features a quad-speed mechanism that sup-
ports sustained data transfer rates of 600 KB per second and a
data buffer to further enhance performance.
The Floppy Disk Drive
Genesis MP has one internal high-density floppy disk drive. This
drive is connected to a 20-pin connector. The table lists the Floppy
Disk Connector pin assignments.
Floppy Disk Connector Pin Assignments
Pin Signal Name Signal Description
1 GND Ground
2 PH0 Phase 0: state control line
3 GND Ground
4 PH1 Phase 1: state control line
5 GND Ground
6 PH2 Phase 2: state control line
7 GND Ground
8 PH3 Phase 3: register write strobe
9 n.c. Not Connected
10 /WRREQ Write data request
11 +5V +5 volts
12 SEL Head select
13 +12V +12 volts
14 /ENBL Drive enable
15 +12V +12 volts
16 RD Read data
17 +12V +12 volts
18 WR Write data
19 +12V +21 volts
20 n.c. Not connected