29 April 2010, 09:05 | #1 |
A500 fan
Join Date: Dec 2009
Location: Oulu / Finland
Posts: 73
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How 2MB chip ram with the Mini Megi Chip?
I bought one of those NTSC Mini Megi Chips from Vesalia for my A500 (PAL). The installation guide was in german so it was quite difficult for me to understand it fully, but with a little help from Google translator I managed to get the chip installed. As it's stated in the guide, the trapdoor memory expansion needs to be turned off. I proved it to be true because my A500 didn't boot if it was turned on. Now I've got 1,5MB chip ram, so how can I get the full 2MB if I can't use the trapdoor expansion?
I have a rev6 mb and the memory expansion card is a 512kB Roctec RM550C. |
29 April 2010, 09:28 | #2 |
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Join Date: Jul 2003
Location: Helsinki / Finland
Age: 43
Posts: 9,918
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Did you have 1MB chip on the machine before? If you had 512/512, then you need to do the 1MB chip mod first.
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29 April 2010, 09:37 | #3 | |||
Thalion Webshrine
Join Date: Jan 2004
Location: Oxford
Posts: 14,470
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Quote:
Quote:
http://aminet.net/search?query=agnus Quote:
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29 April 2010, 09:58 | #4 |
A500 fan
Join Date: Dec 2009
Location: Oulu / Finland
Posts: 73
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@alexh: I'm using the NTSC one. Yeah, it's a bit frustrating to go to early startup menu on each cold boot...
@Jope & alexh: I already had modified the mb for 1MB chip, but I'm pretty sure I couldn't get the A500 to boot if the mod was enabled. By not booting I mean the screen remained black when I turned the power on. But I'll give it an another try when I get back home. I've soldered jumpers on the mb so it's quite easy to test again |
29 April 2010, 10:08 | #5 |
Thalion Webshrine
Join Date: Jan 2004
Location: Oxford
Posts: 14,470
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If it doesn't work. Double check that your mod is correct.
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29 April 2010, 18:30 | #6 |
A500 fan
Join Date: Dec 2009
Location: Oulu / Finland
Posts: 73
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Well, what do you know: It does boot after all! I must have had a loose connection somewhere yesterday Thanks for the help
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04 June 2014, 20:54 | #7 |
Mind Walker
Join Date: Oct 2013
Location: Helsinki, Finland
Posts: 165
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Old thread but still: thumbs up
I bought a Mini Megi board and I just finished modding the board as instructed here: now I have 2 MB Chip Ram, and a working RTC (as I replaced the battery inside the A501) in my A500. Nice! |
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