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Author Topic: Amiga 3000 zip ram problem  (Read 11994 times)

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Offline Zac67

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Re: Amiga 3000 zip ram problem
« on: December 18, 2010, 10:14:37 AM »
Are the ROMs A3000 type? (Is SCSI working?)
On my 3k several pins of the ZIP sockets had no solder, you might want to inspect them. Have you tried different ZIPs in the first bank? If there's a defect chip, none will be detected.
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Offline Zac67

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Re: Amiga 3000 zip ram problem
« Reply #1 on: December 18, 2010, 09:45:46 PM »
Quote from: agr;599699
I've found something intersting: I moved 1MB of chip ram to the fast ram DIP sockets and it works !

With or without moving the RAM size jumpers (J852/853)?

If DIP 256kx4 work and ZIP don't it's clearly a problem with the sockets.
« Last Edit: December 18, 2010, 09:50:55 PM by Zac67 »
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Offline Zac67

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Re: Amiga 3000 zip ram problem
« Reply #2 on: December 19, 2010, 10:21:58 AM »
You should try testing the RAM by absolute address even if it's not added to the system pool, it should be there all the same.
I'm sure I had some tool for that but can't find it atm...
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Offline Zac67

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Re: Amiga 3000 zip ram problem
« Reply #3 on: December 21, 2010, 10:07:56 AM »
RAM grows from $07FF FFFF downwards, so Bank 0 is 07C0 0000-07FF FFFF.

This was apparently done to get a contiguous chunk with accelerator RAM.
The RM is wrong as RAM starts at $0700 0000 for 16 MB, 64 MB were reserved for 'future' mainboard RAM.
« Last Edit: December 21, 2010, 10:50:15 AM by Zac67 »
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