borgen@stud.cs.uit.no (Boerge Noest) (02/27/91)
Machine: PAL B2000 rev4.1 with DF1: I just bought a new Agnus(8372a), and after much trouble(the next one that says "you just pop it out" will get a coredump of emacs in his/her mailbox) I got the old one out, and the new one in. I then moved J102(or was it J101) from pins 1-2 to 2-3, and cut J500. When I switched my Amiga on, the fan started, the powerlight came on, but the screen didn't react at all(and I think it was on long enough to give the drives a chance to start(they didn't), but thinking about how nervous I was I'm not sure). Have I done something wrong? Please help(or does this sound like loadsamoney) 1000 Thanks in advance P.S The chip had pin 41 cut off. Would this matter? -- |/// borgen@stud.cs.uit.no (Borge Nost) \\\| |// ...and then there was AMIGA... \\| |/ studying at the worlds northernmost university (Tromsoe, Norway) \|
mikep@hpmwtd.HP.COM (Mike Powell) (03/02/91)
Pin 41 was cut off??? From Agnus? I don't know what this pin is for for sure, but I have never seen an Agnus missing a 'pin'. This may be your problem. Another problem common with the Agnus is the socket.... The socket contacts can easily get deformed especially during chip extractions. You can re-shape your contacts by making a small tool to ben the contacts outward slightly, improving the connection... I usually use a short piece of wire that has a very small bend approx 1/32-1/16 from the end. This small bend will work as a hook that can be used to 'grab' the bottom of each contact. You then pull the contact away from the side of the socket a little less than 1/8". It will spring most of the way back when you release it. Repeat for all contacts. Of course, this is for the FAT Agnus or later..... the original Agnus is a DIP and this contact problem does not apply... good luck. -Mike-
daveh@cbmvax.commodore.com (Dave Haynie) (03/05/91)
In article <10000022@hpmwmat.HP.COM> mikep@hpmwtd.HP.COM (Mike Powell) writes: > Pin 41 was cut off??? From Agnus? I don't know what this pin > is for for sure, but I have never seen an Agnus missing a 'pin'. As I recall, pin 41 on the ECS Agnus (8372A) is the NTSC/PAL pin. I don't know why anyone would cut this off, though I guess if it were cut off and internally bonded to +5V, it would give you a PAL system with the need to cut J202 on the A2000 motherboard. Or perhaps that's for support of A500s, which may not all have the equivalent jumper. Even if it were floating, that might cause the system to be randomly initialized to PAL or NTSC based on the phase of the moon, but would more likely tend toward one or the other anyway. It should not prevent the operation of the machine. > -Mike- -- Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests" {uunet|pyramid|rutgers}!cbmvax!daveh PLINK: hazy BIX: hazy "What works for me might work for you" -Jimmy Buffett
goddard@ste.dyn.bae.co.uk (Steve Goddard) (03/05/91)
In article <10000022@hpmwmat.HP.COM>, mikep@hpmwtd.HP.COM (Mike Powell) writes: > Pin 41 was cut off??? From Agnus? I don't know what this pin > is for for sure, but I have never seen an Agnus missing a 'pin'. Mike and/or other NTSC folks may not realise that when PAL amigas upgrade to Fatter Agnus, they have to cut off/bend out of the way the NTSC pin, otherwise they get an NTSC display (which doesn`t like being displayed on a PAL monitor). Offhand, I can`t remember the pin no., but 41 sounds about right. (it`s almost opposite pin 1 [sort of 7 o clock]). According to my old Amiga manual this pin is called NTSC even on the old fat agnus. I`m not sure why it is connected on the old one, yet cut off on the new. Perhaps someone else can enlighten me on that. Back to the original post, I had almost the same trub when I put in a Fatter Agnus. First of all I left the NTSC pin connected, and got a luvverly NTSC display (flickered like mad, but I could see the 1meg CHIP ram was working) . Took it out, killed NTSC pin, and it never worked from then onwards. To be fair, when taking it out on this occasion the screwdriver (!) slipped and bent some other pins, which I never got back straight. In my case, I got the RAM check etc power up screens, but no 1.3 hand or power light, just a blank screen. Exit 1 fatter agnus chip towards waste receptacle. Byebye 65 UKpounds. Steve the G. "You can lead a hacker to a terminal, but you can't *make* him code"