Easy address decoding changes with the Micro-KIM?

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Easy address decoding changes with the Micro-KIM?

Postby jrash » Sep Sat 29, 2012 8:42 pm

How hard is it to change the address decoding on the Micro-KIM to allow adding other chips to the memory map? On my Replica 1 this is easy as you can just use one of the 3 already decoded lines to select the breadboarded chip, but the Micro-KIM's map just repeats into infinity.

Thanks!
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Re: Easy address decoding changes with the Micro-KIM?

Postby jac_goudsmit » Oct Tue 09, 2012 12:17 pm

If you remove the address memory jumper near the extension port, it disables the onboard address decoder. You can put an address decoder on an extension board that enables the on-board 6532 and ROM (not sure if extension boards can enable the RAM on the motherboard).

Bottom line is: if you want to add hardware, the easiest way is probably to start with (the schematic of) Vince's RAM extension board, and use the currently unused outputs of its address decoder to enable your extra chips. So, pretty easy I would say.

===Jac
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Re: Easy address decoding changes with the Micro-KIM?

Postby jrash » Oct Mon 15, 2012 7:58 pm

That's what I figured. I went ahead and ordered the RAM expansion and 2nd 6532.

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