Wait state jumper, Wait state – Measurement Computing CIO-DIO192 User Manual
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CIO-DIO192 User's Guide
Installing the CIO-DIO192
Disregard the numbers printed on the switch
When setting the base address, refer to the numbers printed in white on the printed circuit board.
PC I/O Address Summary
Hex Range
Function
Hex Range
Function
000-00F
8237 DMA #1
2C0-2CF
EGA
020-021
8259 PIC #1
2D0-2DF
EGA
040-043
8253 TIMER
2E0-2E7
GPIB (AT)
060-063
8255 PPI (XT)
2E8-2EF
SERIAL PORT
060-064
8742 CONTROLLER (AT)
2F8-2FF
SERIAL PORT
070-071
CMOS RAM & NMI MASK (AT)
300-30F
PROTOTYPE CARD
080-08F
DMA PAGE REGISTERS
310-31F
PROTOTYPE CARD
0A0-0A1
8259 PIC #2 (AT)
320-32F
HARD DISK (XT)
0A0-0AF
NMI MASK (XT)
378-37F
PARALLEL PRINTER
0C0-0DF
8237 #2 (AT)
380-38F
SDLC
0F0-0FF
80287 NUMERIC CO-P (AT)
3A0-3AF
SDLC
1F0-1FF
HARD DISK (AT)
3B0-3BB
MDA
200-20F
GAME CONTROL
3BC-3BF
PARALLEL PRINTER
210-21F
EXPANSION UNIT (XT)
3C0-3CF
EGA
238-23B
BUS MOUSE
3D0-3DF
CGA
23C-23F
ALT BUS MOUSE
3E8-3EF
SERIAL PORT
270-27F
PARALLEL PRINTER
3F0-3F7
FLOPPY DISK
2B0-2BF
EGA
3F8-3FF
SERIAL PORT
You can set the base address switch to any address in the range of 000-3F8. If you are not using IBM
prototyping cards or another board which occupies these addresses, 300-31Fh are also free to use.
Addresses not specifically listed, such as 390-39Fh, are not reserved and may be available. Check your
computer for other boards which may use I/O addresses.
Wait state jumper
The CIO-DIO192 board has a wait state jumper which you can set to enable an on-board wait state generator. A
wait state is an extra delay injected into the processor's clock via the bus. This delay slows down the processor
when the processor addresses the CIO-DIO192 board, so that signals from slow devices (chips) are valid.
configured for OFF (wait state is disabled).
Figure 2. Wait state jumper
O
N
O
F
F
WAIT
STATE
The wait state generator is only active when the CIO-DIO192 is being accessed. Your PC will not be slowed
down in general by using the wait state.
Because all PC expansion board buses are slowed to either 8 MHz or 10 MHz, the wait state generally is not
required. If you experience sporadic failures, try enabling the wait state generator.
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