Compaq Portable 286 Compaq Portable Computer, Compaq Plus Personal Computer, a - Page 114

Compaq Portable 286 512/2048 KByte Memory Expansion Board Jumper Settings

Get Compaq Portable 286 - Notebook PC PDF manuals and user guides View all Compaq Portable 286 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 114 highlights

J1 Diskette/tape Secondary address Primary address controller board (370h) (3F0h) base address select (default setting) J2 COM1/COM2 select Serial port set to Serial port set to COM1 (default COM2 setting) J3 Printer enabled Parallel printer port Parallel printer port disabled enabled (default setting) J4 Communications Serial Port IRQ4 Serial port IRQ3 Interrupt select selected selected (default setting) When changing the asynchronous communications port, both the COM1/COM2 address select (J2) and the IRQ3/IRQ4 interrupt select (J4) must be changed. If COM 1 is selected, the interrupt IRQ4 must be selected. If COM2 is selected, the interrupt IRQ3 must be selected. Shunt Jumper Switch Position Function Switch Setting J1 * Serial communications - open connectors = COM1 (Shunt Jumper) on left side IRQ4 - open connectors = COM2 on right side IRQ3 J2 * Controller address select - open connectors on (Shunt Jumper) left = primary controller - open connectors on right = secondary controller * To change the setting, remove the shunt jumper from its socket, rotate it 180 degrees, then reinstall it into the socket. SW1 Switch 1 Fixed disk drive enabled - ON = enabled OFF = disabled Switch 2 Printer port enabled - ON = enabled OFF = disabled Switch 3 and Switch 4 Not used Chapter 8.6 Compaq Portable 286 512/2048 KByte Memory Expansion Board Jumper Settings The total system memory for the COMPAQ PORTABLE 286 Personal Computer can be expanded to the 1.0 to 3.0 megabyte address range by using the 512/2048 Kbyte memory expansion board. The base memory size depends on the type of RAM chips installed in Bank 1 of

  • 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
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
------------------------------------------------------------------------------
J1
Diskette/tape
Secondary address
Primary address
controller board
(370h)
(3F0h)
base address select
(default setting)
J2
COM1/COM2 select
Serial port set to
Serial port set to
COM1 (default
COM2
setting)
J3
Printer enabled
Parallel printer port Parallel printer port
disabled
enabled (default
setting)
J4
Communications
Serial Port IRQ4
Serial port IRQ3
Interrupt select
selected
selected
(default setting)
------------------------------------------------------------------------------
When changing the asynchronous communications port, both the COM1/COM2 address
select (J2) and the IRQ3/IRQ4 interrupt select (J4) must be changed. If COM 1
is selected, the interrupt IRQ4 must be selected. If COM2 is selected, the
interrupt IRQ3 must be selected.
------------------------------------------------------------------------------
Shunt Jumper
Switch Position
Function
Switch Setting
------------------------------------------------------------------------------
J1 *
Serial communications
- open connectors = COM1
(Shunt Jumper)
on left side
IRQ4
- open connectors = COM2
on right side
IRQ3
J2 *
Controller address select
- open connectors on
(Shunt Jumper)
left = primary
controller
- open connectors on
right = secondary
controller
------------------------------------------------------------------------------
* To change the setting, remove the shunt jumper from its socket, rotate it
180 degrees, then reinstall it into the socket.
------------------------------------------------------------------------------
SW1
------------------------------------------------------------------------------
Switch 1
Fixed disk drive enabled
- ON = enabled
OFF = disabled
Switch 2
Printer port enabled
- ON = enabled
OFF = disabled
------------------------------------------------------------------------------
Switch 3 and Switch 4
Not used
==============================================================================
Chapter 8.6 Compaq Portable 286 512/2048 KByte Memory Expansion Board Jumper Settings
The total system memory for the COMPAQ PORTABLE 286 Personal Computer can be
expanded to the 1.0 to 3.0 megabyte address range by using the 512/2048 Kbyte
memory expansion board.
The base memory size depends on the type of RAM chips installed in Bank 1 of