Andrew LinuxJedi
UNITED KINGDOM • + Follow
Jun 10,2021
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Amiga 500/2000 2MB Chip RAM Mod

Allows you to upgrade older Amiga 500/2000s to have 2MB Chip RAM
8175
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8.50 (1)
Published: Jun 10,2021
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Topic
Computers & USB
Agnus Upgrade RAM Amiga
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  • Hello, is this mod compatible with A500 rev5 motherboard? Can I use an A600 Agnus? Thanks, Marcepan

    Apr 14,20242 Comments
    Andrew LinuxJedi 2024-04-16 13:56:27Reply

    Hi Marc, Yes, it is compatible with rev 3 and 5, but the orientation will be different, off the top of my head the long part of the board will be facing the front of the machine. Pay close attention to where pin 1 is on those boards. My main concern is it might hit the bottom of the keyboard, the physical fit is something I haven't tested. I *think* it will fit, but can't guarantee it. Yes, an A600 Agnus will work fine.

    Marc Epan 2024-04-19 21:10:06Reply
    Reply@ Andrew LinuxJedi：

    Hi Andrew, thank you for your confirmation. I'll check orientation and possible conflict with the keyboard. If it's ok I'll do my mod during summer holiday

    Reply

  • Hi Andrew, hope all is well. I bought a couple of Sukkopero's a500+ boards and also some of these 2Meg-Chip-ram boards. My question is, Can the 2 MB RAM chip on the Agnus board be used to populate the motherboard without the need of using the small memory chips in the memory sockets ? I'd like to use your agnus with 2MB to populate one of the motherboards with it. Thanks Brian

    Jul 25,20221 Comments
    Andrew LinuxJedi 2022-07-25 13:50:09Reply

    Hi Brian, Sukkopero's A500++ boards already uses an Agnus 8375 so this board would not be compatible (the pinout for the motherboard Agnus would be incorrect). Having said that if you have the 2MB RAM chips you could conceivable design a mod board which sits in the RAM sockets and wires the single RAM chip to the correct address / data / control lines.

    Reply

  • With my 500 Rev 6a and original 512KB installed, with pistorm it works but crash all the time, only some times i can use it 30.40 minutes where all works whdload too than crash, with a real 68000 seem to be stable but i cant do a mem test with success. I have tried with two different 8375, same problems, i have tried with a real a20 wire or with jp5 mod to provide A20, i have tried with a very short A20 wire but nothing.

    Dec 05,20215 Comments
    Andrew LinuxJedi 2021-12-06 15:28:14Reply

    Hi Marco, This sounds more like a PiStorm issue. If you head on over to the PiStorm Discord we have two support channels there where we can help you out: https://discord.gg/AJpM5Dj3yd In the mean time you can try running ATK's memory test on the Chip RAM (don't do it on PiStorm's fast RAM since that is emulated) to double check that the RAM on the board is good: https://github.com/keirf/Amiga-Stuff/releases

    Andrew LinuxJedi 2021-12-06 15:46:32Reply

    Sorry, I missed that you mentioned a memory test is failing. Can you please attach a screenshot of the failure (or send it to me any other way?), it will help me figure out where the problem lies.

    Marco Pantanetti (persso Task SRL) 2021-12-06 23:23:15Reply

    Thanks for support, this evening i will post an image

    Marco Pantanetti (persso Task SRL) 2021-12-08 14:53:46Reply

    Hi, linux jedy, today here it's a not working day and i have reinstalled the Amiga 500/2000 2MB Chip RAM Mod, in this moment the ATK 1.28 it's running with Amiga 500 Rev6a 512k stock chip ram, Kick 3.2 and the 2MB chip installed, at this time is at 20.1 round and no problem seems to work fine, I will wait until round 50 and stop it. After that i will reinstall pistorm, test only the 2MB chip ram with ATK 1.18 and reply to this post. Thaanks a lot

    Marco Pantanetti (persso Task SRL) 2021-12-12 18:07:31Reply

    Hi, as written at 08/12 i have reinstalled all and fully tested until now, een with pistorm the 500 is stable an working with no problem,obviously there was something wrong last time, bad contact in 2 MB chip socket, bad contact in pistorm socket, in kickrom socket or so but now it's stable, thanks a lot.

    Reply
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