[Coco] Coco 1 263-3001 just goes to 'ok' prompt when turned on
Arthur Flexser
flexser at fiu.edu
Fri Dec 6 23:15:48 EST 2013
It's been quite a few years, but I'm pretty sure I remember that
holding down reset for a long time resulted in memory deterioration.
Someone with a real CoCo available can easily test this: load a
longish Basic program into memory, then hold down the reset button for
30 seconds or so. If the program still lists correctly, then my
memory is mistaken.
Art
On Fri, Dec 6, 2013 at 10:40 PM, Darren A <mechacoco at gmail.com> wrote:
> On Fri, Dec 6, 2013 at 7:54 PM, Arthur Flexser wrote:
>
>>
>> I thought memory refresh required the CPU to strobe various address
>> columns or something. Merely having power supply capacitors holding
>> some voltage will do it?? I recall having tried holding down the
>> reset button for a number of seconds and seeing memory deteriorate
>> over that interval, when presumably the power supply caps were at full
>> charge.
>>
>>
> Memory should not deteriorate while the Reset button is held down. The SAM
> is responsible for RAM refresh and, by design, it performs that task even
> while Reset is being asserted.
>
> Darren
>
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