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Old 5th Aug 2020, 7:58 pm   #50
SiriusHardware
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Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,484
Default Re: MK14 memory upgrade

Yes!

With the NRDS and NWDS signals actually being picked up from the right places, it works, I can enter data anywhere between 0200-07FF and it 'sticks'.

So now I have a 'RAM Pack' which I can just plug in for an instant extra 1.5K of MK14 RAM.

The chip enable circuit for the 6116 is as per my rough sketch using a 74LS27 in #44, Slothie's streamlined circuit using a 74x02 in #45 will obviously also work fine as long as you route NRDS to RAM _OE and NWDS to RAM _WR.

The 6116 RAM in my case is a brand I haven't really heard of, an 'Elcap' EL6116-10. We had a tube at work.

I haven't connected the VDU to the far end of the 'bridge PCB' since I added the RAM to it - I will, but when I do I'll continue in the VDU thread.
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