General – Page 6 – JAMMArcade.net

Server move and down time

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May 302019

The usual visitors to this site will have noticed that it has been offline for a few days.
Basically the site had grown too big for for our hosting and I made the decision to move.
Obviously this comes at a cost and for a time I thought I was going to have to make some compromises.
Luckily, for this year at least, I had a cash injection from Banjo Guy Ollie & Caius which has allowed me to pay for what was needed.

I am contemplating setting up a Patreon or something in order to help pay for this cost going forward.
We will see how it goes.

Massive thanks to Banjo Guy Ollie & Caius for the contributions.

6116 to Sony CXK5808 RAM adapter

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May 262019

The Sony CXK5808 is a 1k x 8-bit RAM of which we know very little about, no datasheet from manufacturer is available, we can only find its pinout on schematics of arcade PCBs.It’s a 400mil DIP22 IC:

Therefore time ago I designed a simple adapter in order to use a common 6116 (or other 300mil DIP24 2k x 8-bit RAM device) in place of this obscure and hard to find part :

Here’s testing of the adapter on my Gun.Smoke PCB:

BINman update

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May 212019

Quick update here.

One small bug fix with the byte sum not clearing when reset.
The analysis routine has been updated to check if alternate bytes are stuck high, low or are all the same.

I think that’s all. There may be other things too but its been a while and I’ve forgotten what they might be.
I’ve since started using source control for my projects so will be able to keep better track of things

Vanguard Centuri Sync mod

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Apr 302019

A friend of mine sent me a couple of Vanguard pcbs which didn’t sync at all on all monitors I tested.

The only difference I saw was that his pcbs were Centuri versions while my pcb which synced good was SNK version.

Centuri versions on the video board have a factory mod with some flying wires which are not documented on the schematics and which are related to the sync circuit.

SNK version has no flying wires on the video board:

offcourse undoing the factory mod on the century board fixes the sync problem but I wanted to learn something more.

It seems that Centuri versions were modified to use the positive sync monitor supplied in their cabinets and probably they also improved the sync

signal in comparison to the original circuit.

Anyway , if you want to keep the mod but invert the sync for common monitors or TVs, you have only to solder the wire which goes to pin 3 of the 74LS05 marked in red

to pin 4.

Switching Power Supply Sanwa SNW7-E repair log

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Apr 302019

While cleaning the storage I found a very interesting power supply made by Sanwa and marked SNW-7E which works with 110 or 220V

The model SNW-7F is the same model working with only 110V

It’s a very nice and compact power supply ( with a tendency of getting really hot!) and I learned that it was used on the most famous japanese superguns .