Jumper off (open) on (closed) RAM RAM on the Apollo board OFF ON SCSI Autoboot SCSI Interface OFF ON 060 68040 CPU Installed OFF 060
- RAM Jumper:
- PLEASE NOTE: The accelerator board is only capable of high performance if FastRAM is fitted. If FastRAM is disabled, only a minimal increase in performance will be obtained.
- SCSI Jumper:
- The SCSI interfaces autoboot function should be switched off, if no or no autobootable SCSI devices are connected. If the autoboot function is enabled, the operation system will wait upto 30 seconds to detect any slow but bootable SCSI devices. SCSI devices can still be used with autoboot function disabled. Obviously they will not boot, but it prevents the 30 second delay occuring before booting will occur from a non-SCSI device.
- CLK Jumper:
- The 68040 processor has to be supplied with the double external clock frequency. A 68040RC40 (40Mhz) CPU is operated with an 80MHz crystal oscillator.
The 68060 process (with 50MHz) is operated with it's external bus frequency.
The CLK jumper is used to adjust the corresponding clock distribution as following:
68040-CPU installed position 040 68060-CPU (50MHz) installed position 060 68060-CPU (66MHz) installed position 040