64K OPEN 1-2 OPEN 8K * 8 8K * 8 8K * 8
128K 1-2 2-3 CLOSE 32K * 8 8K * 8
256K 1-2,3-4 1-2 CLOSE 32K * 8 32K * 8 32K * 8
BANK O : U13,U15,U22,U26
BANK 1 : U14,U17,U24,U28
JP8,JP7,JP8 CPU Type Selector (CHIP)
====================================
CPU Type Selector is used to select different type of 486 CPU.
CPU TYPE JP6 JP7 JP8
486 1-2 1-2 1-2
P24T 1-2 2-3 1-2
M6 2-3 1-2 2-3
JP12,JP13,JP16,JP17,JP18,JP20 CPU Type Selector
===============================================
CPU TYPE JP12 JP13 JP16 JP17 JP18 JP20
486SX CLOSE 1-2 1-2 CLOSE OPEN 1-2
487SX CLOSE 1-2 1-2 CLOSE 1-2 2-3
486DX CLOSE 1-2 1-2 CLOSE 2-3 2-3
M6+C6 OPEN 1-2 2-3 CLOSE 2-3 2-3
M6 OPEN 1-2 2-3 OPEN 3-4 1-2
P24T CLOSE 2-3 2-3 CLOSE 1-2 2-3
JP23,JP24 VL-BUS Option
=======================
JP23 JP24
CLOSE 1 WS CLOSE >33MHz
OPEN O WS OPEN <=33MHz
JP14 Clock Generator Frequency Selector (F.XTERNAL)
===================================================
Clock Generator Frequency selector is used to select different frequen-
cy of the clok generator. The frequency is depend of the MHz of the
CPU you are using.
FREQUENCY JP14
1-2 3-4 5-6
50 MHz OPEN CLOSE OPEN
66 MHz CLOSE OPEN OPEN
40 MHz CLOSE CLOSE OPEN
JP9,JP15 Clock Generator Frequency Selector (INTERNAL)
======================================================
FREQUENCY JP9 JP15 JP33
50 MHz 2-3 2-3 1-2
66 MHz 1-2 2-3 1-2
40 MHz 2-3 2-3 2-3
JP5,JP21,JP31 CPU CLK Selector
==============================
CLOCK TYPE JP5 JP21 JP31
486DX- 40/50 MHz
40/50 MHz OSC. 2-3 2-3 2-3
OTHER CPU
DOUBLE FREQUENCY OSC. 1-2 1-2 1-2
JP22,JP32,P3-P7,W3-W8 Cyrix Co-processor Selector
