CrazyBoss Posted April 2, 2022 Share Posted April 2, 2022 Hello. Anyone have any information about how to upgrade an Amiga 500 rev.6a to 1mb, there are space for extra memory at the board, but all the videos/blogs about the subject dont use them but use trapdoor memory, I like to see if anyone actually make the mod to the mainboard without using the trapdoor. Quote Link to comment Share on other sites More sharing options...
Daedalus2097 Posted April 2, 2022 Share Posted April 2, 2022 (edited) Yeah, it's pretty simple to do on the rev. 6a boards. I've done it on several boards without any issues. There are two jumpers involved. The first (JP2) is beside the CPU and the setting of that determines where the extra RAM is mapped. By default it's set for "slow" RAM, so that needs to be swapped to the opposite setting by cutting the existing connection and connecting the other contact to the middle. This will mean that any expansion RAM is seen as chip RAM. The other jumper is JP7a, which is near the trapdoor memory connector. This is used to enable or disable the detection of RAM in the trapdoor slot. This one simply needs to be cut so all connections are isolated. This one is probably optional if you don't have anything plugged into the trapdoor. Essentially, they extra RAM positions on the motherboard are wired in parallel with the connections to the trapdoor slot, so either position can be used. Doing the chip RAM mod (JP2) and just using the trapdoor expansion is a lot easier than soldering in all the extra RAM chips, so a lot of people just opt for that. There's no performance advantage either way. Edited April 2, 2022 by Daedalus2097 3 Quote Link to comment Share on other sites More sharing options...
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