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pretty sure you need a svf file to use openocd.

It should work to use the double with a single chip, but I'm not sure if the extended length of the board might interfere with other parts in the cart.

You can attempt to make the holes smaller, but every manufacture I looked at had different requirements for castellated holes then normal through holes. Usually with castellated holes they will have a minimum hole size of 0.6mm and distance between holes of 0.6mm. The only way to get them to...

Glad it all worked out. Can't imagine how much time was spent soldering all that, heh.

https://www.mvs-scans.com/misc/toshiba-64mbit-adapter-master-ack2.zip Just to be clear, they need to be 74HCT244 and not 74HC244

I think ideally U3, U4, U5 should be 74LVC244 to get the proper 5V to 3.3V conversion, then U6 and U7 should be 74HCT244 to get 3.3V to 5V. However in order to use those 74HCT244's they need to be powered by 5V and those locations are currently wired to 3.3V. You want me to make a version for...

I used ATF1504's in my https://github.com/jwestfall69/neogeo-diag-mvs-cha project as a replacement for the NEO-ZMC. If you scroll 2/3 the way down the page there are details/example on how I programmed them. I had some of same issues with costs originally, but eventually found using a cheap...

Wonder how that "(V)" and "(C)" got added to the jumper descriptions.

If you want, see if this works. It adds 3 jumpers that should in theory make it work as byte or word access. https://www.mvs-scans.com/misc/toshiba-64mbit-adapter-master-ack1.zip This is obviously untested and I have no plans to have any made.

yeah it is a bit more involved then just a jumper. The ICs being used for level translation are uni-directional. When BYTE mode is enabled data line 15 gets switched to an address line, which means the signal needs to flow in the opposite direction.

You are wanting 47 to be GND? or would a jumper that lets you selected between pin 47 being GND or 3.3V be better?

5.1 volts is fine. The caps you replaced shouldn't have killed the board. One is a power filter cap for 12V and other 2 are specific to sound output. 12V is only used for sound amp, everything else is using the 5 volt rail. - Have you used your "cbox" on a different board to verify its...

I would start by checking VCC on one of your 74 series logic chips to make sure you are getting 5V.

I can pull one off a parts board for you

do you get the pulses when you are in the bg ram memory viewer and pressing button 1?

OE will pulse high for me when doing the BG write test in the memory viewer. My BG ram chips are UM6264AK-10L and the datasheet says Its not clear to me if the high pulse is needed or not. Write Cycle 1 shows OE should be high, but write cycle 2 says low. The sony chips you listed seem to...

How about the OE line when you do the write? Does it pulse high?

I'm unclear what you are saying here button 1 = switch between word/byte read + hack I mentioned above to write to ram button 2 = exit memory viewer up/down/left/right = scroll memory BG1/BG2 are the same ram chips (IC16/upper byte and IC17/lower byte). Its weird that both chips are having...

That kinda implies writes aren't happening and ram is just filled with gibberish since its never been initialized. Give this a try https://www.mvs-scans.com/misc/wwfwfest-mad-27c010-4.zip I hacked up the memory viewer so when you press button 1 it will write 0x01010101 to the first address...

The ram model you listed before should be compatible. The writable test works by doing read word from ram flip bits in read word write flipped word to same ram location re-read word from same ram location compare originally read word with newly read word if they match assume memory is...