A2630 JUMPER DESCRIPTION by Dave Haynie CLOCK CONFIGURATION JUMPERS X J200 FPU CLOCK. When HIGH, FPU clock is supplied by a crystal X oscillator at U203; when LOW, FPU clock is supplied by the X 14.3MHz system clock. X J201 CPU CLOCK. When HIGH, CPU clock is supplied by a crystal X oscillator at U202; when LOW, CPU clock is supplied by the X 14.3MHz system clock. X J202 CRYSTAL BRIDGE. When ON, crystal outputs are joined, allowing X both FPU and CPU to be driven from the same asynchronous clock. SYSTEM CONFIGURATION JUMPERS XX J301 MEG4. When OFF, memory decoding is for 4 megabytes, when ON, memory decoding is for 2 megabytes. XX J302 B2000. When OFF, the system is configured for the 2-layer version of the A2000 (West Chester design), when ON, the system is configured for the 4-layer version of the A2000 (West German design). XX J303 AUTO. When OFF, the on-board memory will be autoconfigured, when ON, the on-board memory will be ignored. XX J304 OSMODE. When ON, UNIX system autoboot is selected; when OFF, Amiga system autoboot is selected. The Amiga system will be autobooted anyway if UNIX is not found. MEMORY TIMING JUMPERS XXX J600 ACCESS TIMING. This allows adjustment of memory access timing; SLOW when RIGHT, FAST when LEFT. XXX J601 PRECHARGE TIMING. This allows adjustment of memory precharge timing; SLOW when LEFT, FAST when RIGHT. XX J602 BURST TIMING. This allows adjustment of memory burst timing; SLOW when ON, FAST when OFF