Computer Busses

B

VESA VL-Local Bus

Table B.1 lists the pin connections for the 32-bit VL-local bus and it shows that, in addition to the standard ISA connector, there are two sides of connections, the A and the B side. Each side has 58 connections giving a total of 116 connections. It has a full 32-bit data and address bus. The 32 data lines are labelled DAT00–DAT31 and 32 address lines are labelled from ADR00-ADR31. Note that although the data and address lines are contained within the extra VL-local bus extension, some of the standard ISA lines are used, such as the IRQ lines.

Table B.1

32-bit VESA VL-local bus connections

Pin	Side-A	Side-B	Pin	Side-A	Side-B
1	D0	D1	30	A17	A16
2	D2	D3	31	A15	A14
3	D4	GND	32	VCC	A12
4	D6	D5	33	A13	A10
5	D8	D7	34	A11	A8
6	GND	D9	35	A9	GND
7	D10	D11	36	A7	A6
8	D12	D13	37	A5	A4
9	VCC ...