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Acer V20 Motherboard

Jumper and Connector Layout

V20 Motherboard Diagram

Note - The blackened pin of a jumper represents pin 1.

CPU Jumper Settings

	JP17	JP21*	JP26	JP27
Intel
25 MHz	1-5	2-3	1-2	1-2
33 MHz	2-6	2-3	1-2	1-2
50 MHz	1-5	2-3	1-2	1-2
66 MHz	2-6	2-3	1-2	1-2
100 MHz	2-6	2-3	1-2	1-2
AMD
66 MHz	2-6	2-3	2-3	2-3
100 MHz	2-6	2-3	2-3	2-3
*NB on most systems JP21 was replaced by a solder link

Jumper Settings

Jumper	Setting	Function
JP1 Password	1-2* 2-3	Check Password Bypass Password
JP2 BIOS Select	1-2* 2-3	Acer BIOS OEM BIOS
JP8 M5115 Func.	1-2* 2-3	Enable M5115 Disable M5115
JP9,JP20* CPU Type	1-2,2-3 2-3,1-2	P24D/P24T (Overdrive) 486-S
JP11 IDE I/O address	1-2* 2-3	Local IDE I/O address select 0FXH Local IDE I/O address select 07XH
JP12	1-2 2-3*	Disable local IDE Enable local IDE
JP22 DX4 Clock	1-2 2-3 3-4	x 3 (tripled) x 2.5 x 2 (doubled)
JP23	1-2* 2-3	Enable reset button Disable reset button
JP24	1-2 2-3*	Reset becomes Suspend function Normal reset function
Non-Configurable Jumpers
JP3	3-4
JP4	1-2, 3-4, 5-6
JP6	2-3
JP7	2-3
JP10	1-2

Connector Functions

Connector	Function
NC1	Serial port 2
NC2	Serial port 1
NP1	Parallel port
CN1	Game port connector
CN3	Secondary IDE connector
CN4	Primary IDE connector
CN5	Floppy drive connector
CN8	HDD LED connector
CN9	Acer Multifunction connector
CN10	Multifunction connector

Memory

4/8/16 MB 72 Pin, 70ns, Non-Parity Fast Page Mode SIMMS with gold tips. You cannot mix and match parity and non-parity memory within a bank. Maximum : 64MB

Cache RAM

	Data chips		Tag chip	JP13	JP15	JP16
	U38-41	U47-50	U31
128K	32K x 8	empty	32K x 8	2-3	2-3	1-2
256K	32K x 8	32K x 8	32K x 8	2-3	1-2	2-3
512K	128K x 8	empty	32K x 8	1-2	1-2	1-2