Hi Kevin,

Yeah but where exactly can you find the MOS Data sheets can you supply
a URL please, I haven't found much on those.

Thanks for your reply.
Terry Raymond




On Saturday, November 21, 2015 at 12:23:47 PM UTC-8, Terry Raymond wrote:
> Hi where could I find all C64/ C-128 MOS chip pin info mainly I need to know
with each chip where Ground pin is?
>
> I have the Howard Sams C64 repair manual it mentions a lot of the chips but
no DATA on the pins.
>
> I looked n the C64 Programmers Reference manual but not much there.
>
> I saw a utube video of a guy using a Multi-Meter set on OHM's but the highest
reading,
> he mentioned finding the GND pin, then reading each pin should read very
high.  His findings revealed any low resistance
> reading might indicate possible internal malfunctions, shorts etc (inside the
chip).  He was testing a PLA chip this way, then
> inserted it into the chip socket, turned the power on, getting anything from
garbage screens, no startup message, no READY prompt
> Blank or black screen (is what mine is doing)
> etc.  He read a good PLA with high resistance readings and that PLA worked
okay.
>
> Oh I forgot to mention in the PLA and maybe VIDEO test do the following:
> Remove both CIA chips, and SID chip, then see what the startup does.
>
> Will the C64 still startup without the PLA chip installed, I need to test the
VIC to maybe see if its bad, my Howard Sam's repair
> manual mentions the VIC could cause a black blank screen?
>
> The power source Im using is a known good unit so it must be a bad chip.
>
> BTW my breadbin is a 1983 model
> I have desoldered
> 2- CIA chips
> 1- PLA chip
> SID has a socket
>
> Once IF I can find the problem I will solder in chip sockets.
>
> My Howard Sams manual says you can use toothpicks to temporarily test each
chip in its circuit without having to
> solder anything, has anybody ever tried that?
>
> BTW I found a cheaper Thermal Hot Air Desoldering unit on Ebay cheaper than
the Hakko (I may be spelling it wrong)
> there are cheaper units like Hako but I could not find one.  The Hako was
going from $100 up to $700 .
> My unit just has a fan that blows hot air but its still awesome.
> I discovered this by watching utube videos on desoldering.
>
> Anyway little off topic but if some dont know of this I thought I would
mention the Hako and Hot air devices only used for
> electronics only.  My Thermal unit will even do heat shrink and some plastic
welding.
>
> Utube is my buddy now. :)
>
> Terry Raymond

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