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#1 2006-07-07 11:16:56

importeur3
Guest

HARDWARE MODIFICATIONS

In preparation of the new Prophet64 Cartridge release, I have made a
few modifications to my 64. I thought some of
you may enjoy checking them out.

www.bigmech.com/misc/c64mods/

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originally posted by

alpha_c64

 

#2 2006-07-07 11:18:49

importeur3
Guest

Re: HARDWARE MODIFICATIONS

Rad!

It took me a second to find the fourth pot, and I was wondering if you
noticed any better quality with the direct connections for audio
video, etc...

Will the video screen be one of those flip ps1 type screens?

Peter

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originally posted by

kradlabs

 

#3 2006-07-07 11:19:33

importeur3
Guest

Re: HARDWARE MODIFICATIONS

very nice and clever...admirable

Can you tell us more about that S-video output? how did you do it?
(schematics)...

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originally posted by


koney2323

 

#4 2006-07-07 11:20:30

importeur3
Guest

Re: HARDWARE MODIFICATIONS

LIttle hard to follow with so many extreme closups of who knows where and no
explanation... care to add some text to we can totally just rip you off?

What is that C64 Serial thing with the phone jack?

Also, what is that Picture in Picture on your screen, are you using Picture in
Picture or.... what's up?

where do the trim pots get connected to exactly?

soo many questions..

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originally posted by

David Dineen-Porter

 

#5 2006-07-07 11:47:02

importeur3
Guest

Re: HARDWARE MODIFICATIONS

and I was wondering if you noticed any better quality with the direct connections for audio
video, etc...

Audio: Perhaps. I did not make a comparison before the mod.
Video: Absolutely! S-video is much sharper and saturated.
Unfortunately, this can't be done with breadbox C64's. A 64C is required.


LIttle hard to follow with so many extreme closups of who knows where and no
explanation... care to add some text to we can totally just rip you off?

Certainly!
•Relocated power port
•Relocated internal RF modulator baord
•Separated audio(in/out)/video
•Converted composite video to S-video output (greatly enhanced
quality) (64C only)
•Adapted Audio in/out to two standard ¼" jacks
•Relocated and adapted serial port
•Hardwired DIN SYNC (Roland Sync) to Prophet64 user port specifications
•Added dedicated SYNC port
•Added surface mount potentiometers hardwired to Control Port Paddles
X1, Y1, X2, Y2
•Created type 1 PC LPT port to the Commodore serial bus conversion
circuit inside of a DB25 connector shell to use PC as emulated 1541
floppy drive
•Added reset button in recessed location and additional accidental
reset protection
•Minor cosmetic enchantments


What is that C64 Serial thing with the phone jack?

I came up with this when I was hacking my Hummer DTV to a C64.
See: www.bigmech.com/misc/minic64/
Space was a major issue and I found the phone jack to be the smallest way to connect 6 conductors. (CLK, ATN, DATA, Board GND, Batt +5, Batt GND)

Most phone jacks have 2 or 4 conductors. But, adding more is easy since they were designed to host up to 6. Not to be confused with Handset and CAT RJ-45 connectors.

I decided to stick with this method so I can swap cables around without needing adapters. In a way, I created my own little standard for keeping my stuff compatible. This also freed up one of the DIN ports which I used to add the dedicated DIN SYNC port. It also gave me something to do with the square port which was originally the RF L-H select switch.


where do the trim pots get connected to exactly?

Control Ports 1 and 2, of course. They are hardwired to the main board.
See:

http://www.bigmech.com/misc/c64mods/ctrlprts.jpg

I may add a switch to disable them for normal paddle use. But, I haven't thought of a situation where I'll ever need "normal" paddles again.


soo many questions..

I'm not sure how long I'll keep up with the Qn'A here. But, I'll make an attempt to clarify things since I didn't write much about what I had done.


And where in gods name is the power supply?!

I relocated that to the back of the unit. I wanted everything accessible from the back so I don't have to worry about leaving(wasting) the extra space to the side of the unit. I like to mash me gear close together.

See:

http://www.bigmech.com/misc/c64mods/jamsession.jpg

__________________________________________________________
originally posted by

alpha_c64

 

#6 2006-07-07 12:55:06

importeur3
Guest

Re: HARDWARE MODIFICATIONS

Where did you get schematics for the DIN SYNC mod? also, what are those 2 ICs in the serial to LPT port converter?

I think i can do the audio in/out svideo mod easily enough, and the 4 knobs should be pretty simple actually, once i open up my c64c and investigate the board to see where the control knobs are. Afterall, i made my own set of paddles back when i didnt' hav any, it's probably basically the same.

But the things that blow my mind are the internal Din Sync, and that epyx fastload cartridge which appears to have some sort of button on it.. i'm curious to know if / how you modified that cartridge..

unless that cartridge is what you put an EPROM of prophet64 on... duh.. i guess i just reasoned it out.


the serial to LPT thingie you made though, that doesn't look like an XE1541 in there, ie 2 ICs... my 1541 just has a diode or two...

two mysteries...

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originally posted by

slorrin

 

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