HP Model 712/100 hp 9000 series 700 model 712 technical reference manual (a261 - Page 25

HP Parallel, Table 2-4. HP Parallel Interface Information, Audio

Get HP Model 712/100 - Workstation PDF manuals and user guides View all HP Model 712/100 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 25 highlights

HP Parallel The Parallel Interface is an 8 bit parallel, synchronous interface commonly used for printers. The hardware implementation has bidirectional capabilities compatible with PS/2 standards, also know as Centronics R interface. The hardware is also capable of interfacing to BiTronics type printers which transmit status information back to the workstation. The HP Scanjet parallel port interface is NOT supported on this workstation, even through software handshaking. Technical information for the HP Parallel interface is listed in Table 2-4. Table 2-4. HP Parallel Interface Information Function Type: Data rate: Device Limit: Connector Type: Data Centronics, NACK and BUSY handshakes >400 Kbytes/second with DMA 250 Kbytes/second sustained 1 25-pin female DB25 connector; IBM PS/2 PS/2 The keyboard and mouse interfaces are implemented by simple serial ports conforming to the defacto industry standard PS/2 specification. Both the keyboard and mouse have a dedicated serial port of its own. The interface ports rely on the software to provide all of their intelligence; therefore, they do not interpret the characters passing through them in either direction. The interface to the host processor is through 6 one-byte registers for each port. The keyboard and mouse are connected to the system via standard PC-style, miniature DIN connectors. The keyboard is a PC compatible 101 and 102 key layout PS/2-style with a cable length of 7.5 feet. The 3-button mouse (A2839A) comes with a 9 foot cable, the mouse can be ordered separately. It is not recommended to extend the keyboard or mouse cables beyond 15 feet, due to signal degradation. Audio The heart of the audio system is the CODEC (coder-decoder). The CODEC combines CD and DAT quality stereo A/D converters for microphone and line input levels, as well as D/A converters for driving headset and the speaker. The input sampling rate and format are programmable, as are the input gain control (used for software control of recording levels) and output attenuation. There will be a single output jack provided with this product that provides headset output. Although this output is capable of driving 8 Ohms, it can also be used for higher impedance devices with little or no additional distortion, thus a line level input can be driven by the headset output. The following describes the input and output specifications: H 16 bit resolution. H Sampling rate up to 48 KHz. H 1/8-in. connectors for the mono microphone, stereo line in, and stereo headset out. Model 712 Technical Reference System Board 2-5

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
2-5
System Board
Model 712 Technical Reference
HP Parallel
The Parallel Interface is an 8 bit parallel, synchronous interface commonly used for printers. The
hardware implementation has bidirectional capabilities compatible with PS/2 standards, also
know as Centronics R interface. The hardware is also capable of interfacing to BiTronics type
printers which transmit status information back to the workstation. The HP Scanjet parallel port
interface is NOT supported on this workstation, even through software handshaking.
Technical information for the HP Parallel interface is listed in Table 2-4.
Table 2-4. HP Parallel Interface Information
Function
Data
Type:
Centronics,
NACK and BUSY handshakes
Data rate:
>400 Kbytes/second with DMA
250 Kbytes/second sustained
Device Limit:
1
Connector Type:
25–pin female DB25 connector; IBM PS/2
PS/2
The keyboard and mouse interfaces are implemented by simple serial ports conforming to the de-
facto industry standard PS/2 specification. Both the keyboard and mouse have a dedicated serial
port of its own.
The interface ports rely on the software to provide all of their intelligence;
therefore, they do not interpret the characters passing through them in either direction.
The
interface to the host processor is through 6 one-byte registers for each port. The keyboard and
mouse are connected to the system via standard PC-style, miniature DIN connectors.
The
keyboard is a PC compatible 101 and 102 key layout PS/2-style with a cable length of 7.5 feet.
The 3-button mouse (A2839A) comes with a 9 foot cable, the mouse can be ordered separately.
It is not recommended to extend the keyboard or mouse cables beyond 15 feet, due to signal
degradation.
Audio
The heart of the audio system is the CODEC (coder-decoder). The CODEC combines CD and
DAT quality stereo A/D converters for microphone and line input levels, as well as D/A converters
for driving headset and the speaker. The input sampling rate and format are programmable, as
are the input gain control (used for software control of recording levels) and output attenuation.
There will be a single output jack provided with this product that provides headset output.
Although this output is capable of driving 8 Ohms, it can also be used for higher impedance devices
with little or no additional distortion, thus a line level input can be driven by the headset output.
The following describes the input and output specifications:
H
1
6 bit resolution.
H
Sampling rate up to 48 KHz.
H
1/8–in. connectors for the mono microphone, stereo line in, and stereo headset out.