jumper settings

rev 1 & 2
JP1 -	reserved
JP2 -	cache burst to A4000 motherboard: ON - enabled
JP3 -	interrupt pending: ON - DMA backoffs, OFF - DMA ignores interrupt
JP4 -	LUN scan: OFF - enabled
JP5 -	autoboot: OFF - enabled
JP6 -	EPROM type: 1-2 - 27C256, 2-3 - 27C512
JP7 -	CPU power: 1-2 - 5V, 2-3 - 3.3 V
JP8 -	CPU clock: 1-2 - 68040, 2-3 - 68060
JP9 -	(rev 2 only) system clock: ON - >60 MHz, OFF - <60 MHz

JR1 -	fast memory write: OFF - enabled
JR2 -	burst mode: OFF - enabled
JR3 -	RAM speed: OFF - faster access time
JR4 -	FCLK: ON - >58 MHz
JR5 -	EDO RAM support: OFF - enabled
JR6 -	RAM size: ON - 16 or 32 MB, OFF - 4 or 8 MB
JR7 -	RAM type: ON - double sided, OFF - single sided
JR8 -	SCSI: ON - enable

rev 3 & 4
JR1 -	burst mode: OFF - enabled
JR2 -	RAM speed: OFF - faster access time
JR3 -	reserved
JR4 -	reserved
JR5 -	RAM size: ON - 16 or 32 MB, OFF - 4 or 8 MB
JR6 -	RAM type: ON - double sided, OFF - single sided
JR7 -	EDO RAM support: ON - enabled

JP8 -	CPU clock: 1-2 - 68040, 2-3 - 68060
JP9 -	CPU power: 1-2 - 5V, 2-3 - 3.3 V
JP10 -	EPROM type: 1-2 - 27C256, 2-3 - 27C512