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Author Topic: Quick 1MB Agnus and OCS Denise question on A2000  (Read 3002 times)

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Offline save2600Topic starter

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Quick 1MB Agnus and OCS Denise question on A2000
« on: August 29, 2010, 11:24:44 PM »
Okay - pretty much built a nice looking and complete A2000 from leftovers and parts from my own stock as well as Fester here (thanks man!), but something's got me momentarily stumped... 8372A Agnus, jumper setting to enable clock and extra 512KB as Chip, but... no matter what, I only have 512k Chip and 512k Fast. Actually, 8.5mb Fast with this other card installed. I do NOT have an ECS Denise in this machine. I could have sworn I've seen 1MB Chip before with the regular 8362R8 Denise and 8372A Agnus - but am I mistaken?

Must you have an ECS Denise in order to get more than 512k Chip?

BTW: Fester... that 6.x mobo you gave me does not work. Acid creeped up much worse than I thought. Got up 1/3rd of the way into the 68000. Since I had another mobo, I'm simply working off that now instead of tracking down traces on yours. Will simply keep that as my "new" spare. lol  Kickstart 3.1 chip off that works great though  :)
« Last Edit: August 30, 2010, 12:00:00 AM by save2600 »
 

Offline save2600Topic starter

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Re: Quick 1MB Agnus and OCS Denise question on A2000
« Reply #1 on: August 30, 2010, 12:35:39 AM »
Yeah, that's what I thought. It's a rev. 6.2 mobo.

Alrighty... figured it out. J102, which was just a couple of solder pads, had solder splashed between 'em. Desoldered the pads, moved J101 to the right AND opened J500 - voila! There's my full 1MB Chip RAM  :drink:

Totally goes against what I've read in English online (BBOAH), but after some German translating on other sites - got the desired results. Yay!
« Last Edit: August 30, 2010, 02:03:15 AM by save2600 »
 

Offline save2600Topic starter

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Re: Quick 1MB Agnus and OCS Denise question on A2000
« Reply #2 on: August 30, 2010, 02:28:33 AM »
I tried the J100/J500 combo - didn't work until I desoldered what's supposed to only be the PAL/NTSC switch at J102. Strange as shit, but whatever. It's done!   :drink:
 

Offline save2600Topic starter

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Re: Quick 1MB Agnus and OCS Denise question on A2000
« Reply #3 on: August 31, 2010, 01:21:51 AM »
Yes, you too Fester and thanks again for the Amiga goodies  :)