Apricot Business Audio; System Board Connectors; Hard Disk Drive Connectors - Mitsubishi Electric LS Pro Hardware Technical Reference

3.12

APRICOT BUSINESS AUDIO

The Apricot Business Audio subsystem integrated on the LS Pro system board
is based on a Yamaha YMZ263 chip. It offers two channels each of which can
be independently configured to either playback or record.
Each channel incorporates a PCM/ADPCM encoder/decoder, 12-bit ADC and
DAC and a 128 byte FIFO. In PCM mode the maximum sample rate is 44.1kHz,
in ADPCM it is 22.05kHz.
The digital audio subsystem uses DMA channel 1 to transfer data to and from
audio channel 0 and DMA channel 3 for audio channel 1.
The YMZ263 occupies a block of eight ports from 388-38Fh. A description of
the operation of this block of ports is included section 5.
3.13

SYSTEM BOARD CONNECTORS

Hard disk drive connectors

Control Connector
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
The pin layout of the connector.
Function
host reset-
ground
host data 7
host data 8
host data 6
host data 9
host data 5
host data 10
host data 4
host data 11
host data 3
host data 12
host data 2
host data 13
host data 1
host data 14
host data 0
host data 15
ground
key
LS PRO HARDWARE TECHNICAL REFERENCE 3/21
System Board
Pin Function
21 -
22 ground
23 host IOW-
24 ground
25 host IOR-
26 ground
27 host I/O channel ready-
28 -
29 reserved
30 ground
31 host IRQ14
32 host IOCS16-
33 host ADDR1
34 -
35 host ADDR0
36 host ADDR2
37 -
38 -
39 -
40 ground
2
1
40
39