[Coco] How to check the amount of memory installed?

[Rietveld Rietveld]

See if you can get a hold of Allen Huffman.   He sent me a very short and easy program a year or so ago to check for 64k.        I can't remember where I put it.

Sent from my BlackBerry Passport Red Edition.
  Original Message
From: Arthur Flexser
Sent: Sunday, July 16, 2017 6:15 PM
To: CoCoList for Color Computer Enthusiasts
Reply To: CoCoList for Color Computer Enthusiasts
Subject: Re: [Coco] How to check the amount of memory installed?


Michael, if the Basic program you found for testing for 64K does nothing
but check some location around 65000 decimal, you should be aware that this
is not a reliable test, and really checks only for the Radio Shack upgrade
version.  This program appears in some RS tech manuals.

Art

On Sun, Jul 16, 2017 at 6:08 PM, Bruce W. Calkins <brucewcalkins at charter.net
> wrote:

> Sounds like the 64k mod then.  I not seen any ceramic 64k chips, yet, but
> that is not conclusive.  A close paint match is Mercedes Grey from the
> 1980s,  I'm not sure how easy that will be to find these days though.
>
> Bruce W.
>
>
>
> On 07/16/2017 03:37 PM, Michael E Kent wrote:
>
>> Thanks, 24864 comes back so it is at least 32K I guess. The wiring is to
>> a socketed chip to the left of the ram, and I think one of the pins was
>> bent up. I will pull the cover again.  I will do some more testing to
>> confirm it is worth restoration, now to find a decent color match for the
>> paint! I found a listing for a basic program to do it so I will see what
>> happens there!
>>
>> Thanks
>> -----Original Message-----
>> From: Bruce W. Calkins [mailto:brucewcalkins at charter.net]
>> Sent: Sunday, July 16, 2017 12:03 PM
>> To: Michael Kent
>> Subject: Re: [Coco] How to check the amount of memory installed?
>>
>> PRINT MEM <ENTER>; Should give numbers in the 22-28k range for 32k,
>> 12-14k for 16k and 2k for 4k installed memory.  If one of the chips
>> involved in the extra wiring is the 74LS02 to the left of the RAM chips
>> there might be 64k, but I have not seen ceramic 64k chips.  There is a
>> program for checking for 64k, but I would have to search on line for it and
>> don't have the time to look now.
>>
>> Bruce W.
>>
>>
>>
>> On 07/16/2017 10:27 AM, Michael Kent wrote:
>>
>>> I have a CoCo 1 it was originally a 4k machine, it has been modified but
>>> all memory chips are ceramic type chips with no markings whatsoever(not
>>> even on the bottom) alot of soldered wire jumpers and such are in the
>>> vicinity of the ram. I am certain the ram is upgraded. There were also mods
>>> to the case, including a cutout for a db25 connector (whatever was there is
>>> gone) and sloppy repairs to the keyboard cable. I would like to restore
>>> this one as It will give me a 1, 1b,2 and 3. I would like to confirm it is
>>> functional before I do a restoration. It does turn on and the keyboard
>>> works (it was disconnected when it arrived) basically got it for free with
>>> a purchase of 2 disk controllers, which both work.
>>> MikeRadio Shack alumnus 1983-1988
>>>
>>> Sent from Yahoo Mail on Android
>>>
>>>
>
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