Jul 202018
 

The ‘Konami 054574’ can be found on some PCBs from this japanese manufacturer always along with the three RGB DACs ‘054573’ (see past article for this ) so this reproduction is the natural follow up.

It shares the same SIL package and pin counting :

As well as most of the internal circuitry with open collector buffers, R/2R and transistors:

Its functions are not really clear though, for sure it’s connected to the above mentioned ‘054573’ and the ‘054338’ (which is a color mixer for special effects) so possibly it’s a RGB mixer/filter.

I simply reproduced it at ‘low-level’ identifying all the parts with their values and figured out the circuit schematics.Here’s the result .

Testing was successfully carried out on a Wild West C.O.W.Boys of Moo Mesa PCB :

 Posted by at 8:51 pm

Konami ‘007593’ & ‘007327’ reproduction

 Reproductions  Comments Off on Konami ‘007593’ & ‘007327’ reproduction
Jul 142018
 

The ‘007593’ and ‘007327’ are two custom ICs found on many PCBs manufactured by Konami in end 80s.This should be a complete list:

‘007593’ on :

  • Black Panther
  • Contra / Gryzor
  • Hyper Crash
  • Salamander/Life Force
  • City Bomber
  • Kitten Kaboodle / Nyan Nyan Panic
  • Labyrinth Runner/Trick Trap
  • Vulcan Venture / Gradius 2

‘007327’ on :

  • Combat School /Boot Camp
  • Rock ‘n Rage
  • Jackal/Top Gunner
  • Flak Attack
  • Devil World / Dark Adventure
  • Double Dribble
  • Rack ‘Em Up/The Hustler
  • Haunted Castle
  • Super Contra
  • Battlantis
  • Blades of Steel
  • Ajax

Both ICs have strong similarities starting with how they appear:

Analogous package apart, they have same function as we can see from schematics:

But the ‘007593’ and ‘007327’ are not simple RGB DAC as  you can think of at first glance but they embed a complete palette color circuitry on a single chip.So not only RAMs but, as you can see, many other ICs in form of bare dies covered by coating as well passive parts :

Therefore, for this reproduction project I used a different approach.I studied previous Konami hardware figuring out how the color palette circuit was engineered without the use of the customs.After drawed my schematics I reproduced the ‘007593’ for first:

Once successful tested,  it was the turn of the similar ‘007327’ :

Testing on their respective boards:

The layout of both reproductions could be surely optimized (with consequent reduction of the size of the board) using moderm complex programmable logics but I’m happy enough with them since my primary goal was to study a working replacement for these two custom ICs which seems quite prone to failure making our beloved PCBs unusable.

 Posted by at 12:11 pm
Jul 132018
 

Recently I decided to take a look at another custom IC, the Taito ‘PC030CM’:

It’s a 20 pin chip in a brown-ish SIL package used on some PCBs like Arkanoid, Bubble Bobble, Big Event Golf and few other.Like schematics shows, the ‘PC030CM’ handles coin inputs as well counters/lockouts:

If the part fails (most of times it breaks due its fragile nature), the board will no longer boot, an ‘I.O ERROR.’ is all you will get:

For this reproduction project I had no need to inspect or analyze the part but I simply re-engineered,using SMT devices, a replacement board that can be found on some Arkanoid bootlegs:

Then I compared my schematics to work previously done by ‘JROK’ on KLOV forums and, once verified everything, I  designed a proper PCB.Here’s the reproduction how looks fully assembled (I ordered it with red soldermask but manufacturer wrongly made it blue)

For the testing the user ‘manimani’ on Neo-Arcadia forum kindly sold me an original Arkanoid PCB :

The board was missing the ‘PC030CM’ custom :

Some workaround was made in such a way that the board could coin up the same using the SERVICE button instead :

So, this was a perfect platform test for my reproduction which worked fine:

Thanks again to ‘manimani’ and ‘JROK’.See you at my next reproduction project.

 Posted by at 10:07 am

Taito MB112S146 custom reproduction

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Jun 122018
 

Recently I have been working on reproducing the MB112S146 custom chip for my friend BanjoGuyOllie.
This module is found on Arkanoid, Darius and probably some other titles too.
This has now been done and is available in the downloads section. It required the adapter board from ColinD but I will soon compile for MikeJ’s module too.
So far its only tested on Arkanoid but probably will never get a chance to test on other hardware.

 Posted by at 7:39 pm

Cabal joystick sub board reproduction

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Jun 102018
 

This is a simple reproduction I made of the joystick sub board you can find on Cabal PCBs.

I kept the original design of the original sub board which is this:

With the only difference I put the 74LS244 on top of PCB:

The reproduction is something not really great perhaps, someone else already made it it the past like Elgen:

http://elgensrepairs.blogspot.com/2013/04/tad-cabal-trackball-to-joystick.html

But it’s useful if you want to convert a Cabal PCB from trackball to joystick version using at same time the proper ROM set.

That’s all, simple but effective!

 Posted by at 9:17 am