I think I am going to experiment with this Digital Pot http://docs-europe.electrocomponents.com/webdocs/0d2a/0900766b80d2a9fc.pdf by interfacing it to Marantz'z volume control chip - TC9177P, as already i have tried using normal mechanical pots and it works fine, since I cannot mount huge mechanical ...

Micheal, thanks for the links to getting hold of that chip from various companies in HK, but I am sure ordering one costing about 20usd, willbe futile as the program may not be masked for Mrantz or for any other, as these are 4 bit Microcomputers, or controllers. i found a bit more information about ...

I found a schematic and there is plenty on that board that could go wrong.

If it is indeed the micro-controller that has blown I'd remove it and build a 18F PIC based emulation to plug in to the original DIL holes. Basic functions like button scanning to control the input and volume should be ...

I have an Amstrad PC64, it was first kind of lap top made for home user market, had a battery compartment that took around 8 size D cells, and also ran on an adaptor, you had to load a floppy disc to boot up from! and an LCD screen that opened up and a full size keyboard, incidently, it also had a ...

Thank you Micheal once again for your worthwhile effort into looking at this for me, I would appreciate if you can give me some pointers to the broker's contact details.

As a last resort I may look at other options, first let us see if I can get hold of it in its original format, ready masked to ...

Thanks Micheal for looking into this, yes indeed it is described as a 4 bit Micro, with ROM and RAM, so does that mean it is not the same as the generic 6502 processor used in Atari and other earlier computers such as Vic 20,(I bought that as my first home computer mostly for playing games! I ...

I have a bad feelings that the LC6502C used on my Marantz Power Amplifier, is not the same as a generic 40pin chip, as the one used on Mrantz is a shrunk chip, looking at the Mrantz schematic diagram, its VCC pins are shown at pin 1, and GND pins are at pin 20 & 21, as it is a 42 pin chip, as well ...

managed to rescue my Amp, having bypassed all analog gates by switching them ON manually (bridging) and allowing the signal to pass through the various analog filters and Bass & treble which were manual any way, and adding stereo pots to control the volume. Just needs a way of using may be using a ...

Just stumbled across this 6502 reverse engineering on youtube video that may be of some interest to some of you, if not already shown or posted before then by all means move or start another thread on it, if you want.
http://www.youtube.com/watch?v=K5miMbqYB4E

Thanks guys for showing your interest in doing some freelance work, I may contact you when I am ready, or when the projects get more tangible with the interested parties, I may need to proceed and will then require people like yourselves to write me a software, as I am not a company with unlimited R ...

Thank you Both Garth and Big Ed, for your time in looking at this, indeed i can confirm that both chips (my one) and the one I got from Ebay, are 42 pins, but the seller showed a picture of LC6502C and on arrival it was LC6505C!

My best option would be to bypass all analog processor controlled ...

Thank you Garth, for your reply, I wish they did that to most laptops, when they seem to just freeze and you can't do anything unless you force shut it, and then it will need reboot and check disk! (lol)

any way this is what I am looking at, it bis a Marantz stereo Amp, and when I opened to examine ...

Hi people, I joined these forums only to seek help, I am no good at all in programming anything but relays! really, but despite this I have made projects using Static RAMs like 6116 and store data and retrieve data without a processor, using standard CMOS chips like 4558 to address memory locations ...