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  HG440/550 installed in module
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   Author  Topic: HG440/550 installed in module  (Read 800 times)
danox574
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Re:HG440/550 installed in module
« on: February 26, 2011, 09:04AM »
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Perhaps I was confusing when I called the HG440/550 a 'program' -- what I meant was the HG440 opening library had been installed inside of a MMIV module by some enterprising individual, giving the HG44 boot up screen without the separate module installed.

Looking at the MESS source code, it seems that the 16K opening library sits in the $4000 memory block below the program, so it would seem very easy to integrated it to a modified (hacked) MMIV.

Of course, anything possible with the MMIV/HG440 would be possible with the MMV/HG550.

I have some hardware on the way that I will be able to experiment with, I feel pretty confident with some hands on I can do this, I'll post my result down the road.
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tony
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Re:HG440/550 installed in module
« Reply #1 on: February 26, 2011, 07:55AM »
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hi, as I understand it the HG 440 was justa expansion module  for the opening book of the MM IV. developed in march 1988 according to my 87-88 brochure.  regards, tony
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danox574
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HG440/550 installed in module
« Reply #2 on: February 20, 2011, 04:06PM »
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I have seen the MM IV/V made into a switchable module, using a EPROM with double the memory and the high line on the chip tied to a switch so you can toggle between the programs.  This seems very basic.

However, I have also seen these modules with the HG440 or 550 program on board, inside the module.  I do not have a pinout for the HG440/550 modules, so I am curious if anyone has a schematic or online resource that might help someone who has the equipment to do so to figure out how to wire a 440/550 ROM into a MM IV/V module. 

The photos of the HG440 out of it's case on the German wiki seem to indicate that is no more than a memory board with no other logic to speak of, so if you could find the address lines (probably traceable if you have the physical openings module) you could simply place a chip inside the module, power it, and tie it's address and data lines to the right points.

If there is an online resource, or schematics, I'd appreciate a heads up.

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