Hi, what was the speed that you were running with your micro controller, the Arduino board? 8Mhz or 16Mhz or 20Mhz? Thanks!

You could make things so much simpler by just going for a V9938 or V9958 and some DRAMs. :)

http://www.ebay.co.uk/itm/351494243872 - 10 lots of 64Kx4bit DRAMs, $10.39 inc. shipping

http://www.ebay.co.uk/itm/360806353409 - 1 lot of V9958, $8.99 inc. shipping

The only complication is the fact that ...

Using the 4164 to replace the 4116 as far as the read write timing etc goes seems to work fine. I've used one on a board already wired for the 4116 as seen here http://www.primrosebank.net/computers/mtx/projects/mavram/mavram.htm

Running this setup I've had no data loss issues from that ...

I was into other things so I put this project aside for a while. 4164 dram chips I ordered recently arrived and I'll revisit this project. With the lousy interfacing I was not able to properly build the sram interface. Maybe it was the software that was problematic but now I want to try it again ...

Hi i_r_on. Sounds like you're at a stage I was at a few months ago when trying to get the TMS VDP to go with something minimal to prove it was working.

Then I could check that the CPU was talking to the VDP by setting the graphics mode to Text (register 1), and the colour register to a colour I ...

Hi i_r_on. Sounds like you're at a stage I was at a few months ago when trying to get the TMS VDP to go with something minimal to prove it was working.

- I use a 21.4xxMHz clock and then a counter to divide by 2 to get the frequency for the VDP. I couldn't get hold of a 10.7xxMHz clock but had ...

Hi Folks, BigEd posted a question about this to me, as I am the guy on the Hackaday link above with a working 65c02 driving a 9918.

So I am not using any special wait states, clock extending etc. circuitry at all, it is not required (as alluded by aslak in the last reply). But I am only running my ...