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

[Arthur Flexser]

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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