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RAM JUMPERS ADDED

Information and progress towards the H5 board.
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exxos
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RAM JUMPERS ADDED

Post by exxos »

Something which I mentioned in the past also, our jumper links on the SIMM on MAD8&9.

MAD9 will enable / disable 4MB leaving 1MB max.
MAD8 will enable / disable 1MB leaving 256K max.

This was more to allow quick and simple way to force a lower RAM machine for when I write apps etc. it may also be useful for some games which will not work with a 4MB system.

Ultimately I think this can be controlled via a flashyclock register.

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czietz
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Re: RAM JUMPERS ADDED

Post by czietz »

Remark: If you disconnect MAD8 (as well as MAD9, of course), you end up with 256k (not 512k) of RAM. A nice way of emulating an original 260ST prototype :D.
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exxos
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Re: RAM JUMPERS ADDED

Post by exxos »

Oops :) Yep. Maybe I should jumper RAS1 to disable a bank as well. Was really aiming for 512K.

EDIT:
Fixed original post.

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