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Conference hydra::amiga_v1

Title:	AMIGA NOTES
Notice:	Join us in the NEW conference - HYDRA::AMIGA_V2
Moderator:	HYDRA::MOORE

Created:	Sat Apr 26 1986
Last Modified:	Wed Feb 05 1992
Last Successful Update:	Fri Jun 06 1997
Number of topics:	5378
Total number of notes:	38326

5149.0. "Fat Agnus Help needed" by SHARE::DOYLE () Mon Oct 28 1991 08:51

  Hi,

  I recentley installed a fatter agnus in my A500. On usenet I found 
instructions for activating it as well as putting a mode switch in.
In the docs it say's to cut the exram line that comes from pin 32 of the
 A501 expansion slot.
 Although I've located pin 32, I'm still not shure which trace is the 
 correct one, as I can't see a direct connection with the pin.
 Anybody able to give me a better Identafier for the Exram line?

							Thanks;
								Ed

T.R	Title	User	Personal Name	Date	Lines
5149.1	Easier to locate on the A501 connector	CROWES::ROSCETTI	NRB Q-sound	`Mon Oct 28 1991 10:58`	16
	Here's another way to locate the EXRAM line. Locate The A501 memory expansion connector ( right side). Pin 1 is the leftmost pin toward the front. Pin 2 is the right pin. Count up to pin 41. To the left of pin 41 is a plated though hole. The etch that runs from this hole to pin 32 of the Gary Chip is -EXRAM. CUT this trace .OR. carefully lift Gary Out of it's socket and bend pin 32 slightly so that it will not seat back in the connector. If you want to be sure, use an ohmeter to verify that the plated thru hole does go to pin 32. Brien
5149.2	Thanks	SHARE::DOYLE		`Mon Oct 28 1991 12:17`	10
	Thanks... In the instructions I recieved, I'm to solder 2 wires one on each side of the trace, then solder these to the appropriate pins on the switch. I take it that I could solder these to the pin on gary and the socket instead? Ed
5149.3	try the socket and plated thru hole.	CROWES::ROSCETTI	NRB Q-sound	`Mon Oct 28 1991 16:58`	7
	You certainly could solder a wire to pin 32 but I would not recommend it. Anytime you apply heat directly to a chip you run the risk of damage. I would solder one wire to the chip socket pin 32 and put the second wire in the plated through hole. Then I'd make the etch cut close to the hole.