[Coco] Transplanting 512K RAM expansion?

[Fedor Steeman]

Two small questions before I proceed:

1. How can I, from BASIC, check whether the RAM has been properly installed.
I know PRINT MEM doesn't work, so aren't there some POKEs and PEEKs that I
can use?

2. Where on the circuit board can I find C65? There is almost a hundred
capacitators there, and they are not placed in orderly manner according to
number.

Thanks in advance,

Fedor Steeman

On 25/05/06, Fedor Steeman <petrander at gmail.com> wrote:
>
> Thanks a lot, everyone! I will take this information to me and have
> another look at it. Then I will try to muster the courage to meddle with my
> CoCo's internals, which -of course- is always risky. (Good that I have a
> couple of spares...)
>
> Kindest regards,
>
> Fedor
>
>
> On 25/05/06, Bob Devries <devries.bob at gmail.com> wrote:
> >
> > Fedor, apart from removing the ram chips, the coco3 will still remain
> > useable when you modify it for 512K. Removing the capacitors does not
> > stop
> > the coco3 from working as a 128K machine in any way.
> > --
> > Regards, Bob Devries, Dalby, Queensland, Australia
> >
> > Isaiah 50:4 The sovereign Lord has given me
> > the capacity to be his spokesman,
> > so that I know how to help the weary.
> >
> > website: http://www.home.gil.com.au/~bdevasl
> > <http://www.home.gil.com.au/%7Ebdevasl>
> > my blog: http://bdevries.invigorated.org/
> >
> > ----- Original Message -----
> > From: "Fedor Steeman" <petrander at gmail.com >
> > To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
> > Sent: Thursday, May 25, 2006 4:24 AM
> > Subject: Re: [Coco] Transplanting 512K RAM expansion?
> >
> >
> > Thanks, Bob. I understand from what you are saying that one cannot
> > perform a
> > 512K transplant without rendering the source CoCo unusable, because the
> > original 128K RAM chips are removed as well as several capacitators.
> >
> > My problem is that I have a very clean and beautiful Australian CoCo3
> > (for
> > PAL/240V and with 128K) and an old ugly and very dusty CoCo3 (for
> > NTSC/240V
> > and with 512K) previously owned by a heavy smoker. What I want is a
> > CoCo3
> > that is beautiful on the inside (for PAL/240V and with 512K) as well as
> > on
> > the outside (rather like my wife, really).
> >
> > However, I am not ready to sacrifice the old, ugly CoCo just yet, so I
> > will
> > have to figure out something else. I will in any case need to keep both.
> >
> >
> > Cheers,
> >
> > Fedor
> >
> > On 24/05/06, Bob Devries <devries.bob at gmail.com> wrote:
> > >
> > > Fedor, it depends on whether the other coco3 has already been modified
> > for
> > > 512K before. If it has, then yes, it is that easy. If not, you have to
> > > clip
> > > out some capacitors (C65 C66? IIRC). In any case, the original 4
> > memory
> > > chips must be removed if they are still there.
> > >
> > > Hope it helps.
> > > --
> > > Regards, Bob Devries, Dalby, Queensland, Australia
> > >
> > > Isaiah 50:4 The sovereign Lord has given me
> > > the capacity to be his spokesman,
> > > so that I know how to help the weary.
> > >
> > > website: http://www.home.gil.com.au/~bdevasl<http://www.home.gil.com.au/%7Ebdevasl>
> > > my blog: http://bdevries.invigorated.org/
> > >
> > > ----- Original Message -----
> > > From: "Fedor Steeman" <petrander at gmail.com>
> > > To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com >
> > > Sent: Thursday, May 25, 2006 1:12 AM
> > > Subject: [Coco] Transplanting 512K RAM expansion?
> > >
> > >
> > > Hi,
> > >
> > > I want to transplant a 512K RAM expansion from one CoCo3 to another,
> > but
> > > not
> > > being a hardware buff, I am a bit uncertain on how to proceed.
> > >
> > > The 512K RAM expansion seems to sit on top over the location of the
> > > original
> > > 128K RAM-blocks, so it seems an easy job of taking it out and putting
> > it
> > > in
> > > the other CoCo over the 128K RAM-blocks. Is it really that simple? Or
> > are
> > > there other measures I need to take?
> > >
> > > Cheers,
> > >
> > > Fedor
> > >
> > > --
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> > > Coco at maltedmedia.com
> > > http://five.pairlist.net/mailman/listinfo/coco
> > >
> > >
> > > --
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> > > Coco at maltedmedia.com
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> > >
> >
> > --
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> > Coco at maltedmedia.com
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> >
> >
> > --
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>