www.handson.ca www.handson.ca www.handson.ca
 
·  Home  ·  Services  ·  Recycling  ·  Tutorials  ·  Reference  ·  Contact  ·
<== Index
| page 1 of 1 |
 
ISA ( 8-bit )
  1. From the original XT computer systems.
  2. Configured by jumpers.
  3. 8 data lines.
  4. 20 Address lines.
Note: The original 8-bit slot ran at 4.77 MHz and the 16-bit slot ran at 6 MHz. The final standard for both 8-bit and 16-bit was 8.33MHz
Bus Width: 
Speed: 
Transfer Rate: 
IRQ Lines: 
DMA Channels: 
Max. Memory: 		 8-bit
4.77 MHz
2.3 MB/s
8
4
1 MB RAM

 
IRQ
 
0
1
2
3
4
5
6
7		  
 
system timer
keyboard
free
com2
com1
HDD
FDD
LPT1
DMA
 
0
1
2
3		  
 
dram refresh
HDD controller (XT)
FDD controller
free
 
ISA (16-bit)
  1. AT class 286 --> Pentium.
  2. Configured by jumpers.
  3. CPU speeds were tied to bus speeds.
  4. When CPU speeds outpaced bus speeds, CPU clock was separated from bus clock to allow CPU to run at max.
Bus Width: 
Speed: 
Transfer Rate: 
IRQ Lines: 
DMA Channels: 
Max. Memory: 		 8-bit
8.33 MHz
8 MB/s
16
8
--

 
DMA
Channel

0
1
2
3
4
5
6
7

 Channel
Width

8-bit
8-bit
8-bit
8-bit
cascade 0-3
16-bit
16-bit
16-bit

 Channel
Name

data
sound
floppy
data
 
data
data
data

 
IRQ Lines

 
ISA Bus Architecture
 
EISA
  1. Compatible with ISA
  2. Allows Busmastering.
  3. Able to share IRQ's.
  4. Configured by software.
  5. Mainly for 486's and up.
  6. Compressed transfer
  7. Burst mode
Bus Width: 
Speed: 
Transfer Rate: 
IRQ Lines: 
DMA Channels: 
Max. Memory: 		 32-bit
8.33 MHz
33 MB/s
--
--
--
 
MCA
  1. Allows Busmastering.
  2. Configured by software.
Note: Also known as microchannel. Due to proprietary restrictions imposed by IBM, the MCA standard, although superior, never became popular.
Bus Width: 
Speed: 
Transfer Rate: 
IRQ Lines: 
DMA Channels: 
Max. Memory: 		 16/32 bit
10.33 MHz
40 MB/s @ 32 bit
--
--
--
 
VESA Local Bus
  1. Bus acts as an extension of 486 processor.
  2. Configured by jumpers.
  3. Doesn't support PnP or Busmastering.
Note: VESA - Video Electronics Standards Association. Developed standards for VESA Local Bus, VL BUS, VESA.
VLB Bus Architecture
Bus Width: 
Speed: 
Transfer Rate: 
IRQ Lines: 
DMA Channels: 
Max. Memory: 		 32 bit
25 MHz
100 MB/s
--
--
--

 
Bus Width: 
Speed: 
Transfer Rate: 
IRQ Lines: 
DMA Channels: 
Max. Memory: 		 32 bit
33.6 MHz
127 MB/s
--
--
--
 
PCI
  1. Supports PnP and Busmastering.
  2. Configured by software.
PCI Bus Architecture

 
PCI
 
Bus Width: 
Speed: 
Transfer Rate: 
IRQ Lines: 
DMA Channels: 
Max. Memory: 		  
 
32 bit
33 MHz
132 MB/s
--
--
--

 
PCI
 
Bus Width: 
Speed: 
Transfer Rate: 
IRQ Lines: 
DMA Channels: 
Max. Memory: 		  
 
64 bit
33 MHz
264 MB/s
--
--
--

 
PCI 2.1
 
Bus Width: 
Speed: 
Transfer Rate: 
IRQ Lines: 
DMA Channels: 
Max. Memory: 		  
 
64 bit
66 MHz
508 MB/s
--
--
--

 
PCI 2.2
 
Bus Width: 
Speed: 
Transfer Rate: 
IRQ Lines: 
DMA Channels: 
Max. Memory: 		  
 
64 bit
66 MHz
1024 MB/s
--
--
--
 
AGP
  1. For video cards.
  2. Intel designed AGP to link directly into PC main memory.
AGP
 
Bus Width: 
Speed: 
Transfer Rate: 
IRQ Lines: 
DMA Channels: 
Max. Memory: 		  
 
32 bit
66 MHz
254 MB/s
--
--
--

 
AGP x 2
 
Bus Width: 
Speed: 
Transfer Rate: 
IRQ Lines: 
DMA Channels: 
Max. Memory: 		  
 
32 bit
66 x 2 MHz
508 MB/s
--
--
--

 
AGP x 4
 
Bus Width: 
Speed: 
Transfer Rate: 
IRQ Lines: 
DMA Channels: 
Max. Memory: 		  
 
32 bit
66 x 4 MHz
1017 MB/s
--
--
--
<== Index
| page 1 of 1 |