
=============================================================================

Jumpers p Amiga 500/2000 - en sammanstllning baserad p erfarenhet,
ritningar, rykten och Technical Reference Guide.

Av Rasmus Andersson, senast uppdaterad 1991-03-25. Om du kan komplettera min
tabell med tex. A1000, A3000 etc. s skicka grna ett mail till mig p NPD,
Camelot eller NT Uppsala.

Beskrivningarna r p engelska fr att undvika dlig versttning av tekniska
termer...

r3, r5 och r6A str fr olika revisioner av moderkortet. Jag har inte hrt
ngot om dylika skillnader mellan olika revisioner av B2000.

=============================================================================



A500r3	A500r5	A500r6A	 A2000	 B2000	 A3000		description
-------+-------+-------+-------+-------+-------+-----------------------------
 JP1	 JP1	 JP1				connects 555 reset timer to
						main reset
-----------------------------------------------------------------------------
	 	 				A19 or A23 to Agnus A19.
	 JP2	 JP2		J101		A23 = 512Kb Chip (8370/8371)
						A19 = 1Mb Chip (8372A)
-----------------------------------------------------------------------------
	 	 				swaps internal and external
	 JP3	 JP3				RAM (swaps _CAS). Nice if
						internal RAM is faulty
-----------------------------------------------------------------------------
		 				8372A PAL/NTSC. Connect a
		 JP4 		J102		switch here and play your
						games on a 60Hz fullscreen!
-----------------------------------------------------------------------------
		 JP5				28MHz CLK, XCLK, XCLKEN to
		 				Agnus
-----------------------------------------------------------------------------
		 JP6				7M to pin 7 of 86-pin exp.
						connector (same as on B2000)
-----------------------------------------------------------------------------
		 JP7A		J500		connects Gary _EXRAM to GND.
						Remove for 1Mb Chip
-----------------------------------------------------------------------------
		 JP7B	 J34	J300		TBASE from TICK or VSYNC
-----------------------------------------------------------------------------
		 JP8		J200		LPEN from port 0 or 1
-----------------------------------------------------------------------------
		 JP10A				connects AUDIN to pin 18 of
						serial port
-----------------------------------------------------------------------------
		 JP10B				connects AUDOUT to pin 11 of
						serial port
-----------------------------------------------------------------------------
		 JP11				connects CSYNC to BCSYNC or
						Video Hybrid
-----------------------------------------------------------------------------
			 J36	J301		close this to enable second 
						internal floppy drive
-----------------------------------------------------------------------------
 JP2				J100		_LATCH from Gary or flip flop
-----------------------------------------------------------------------------
			 J1			connects shield to PS GND
-----------------------------------------------------------------------------
			 J35			connects NiCd battery to real
						time clock chip
-----------------------------------------------------------------------------
