[Coco] CoCo 2 16k.. Upgrade or no?
Aaron Banerjee
spam_proof at verizon.net
Sun Mar 18 11:41:17 EDT 2012
I honestly didn't realize that we had varying opinions. The only
reason I could possibly see why you wouldn't want to upgrade a Coco
from 16 to 64K would be if you had one of those old "D" board Coco I's
that required "surgery" and you didn't want to risk ruining your
antique. If I recall properly, a Coco II is really easy to upgrade
(replace chips, and maybe a solder point -- or was it a jumper or
something? been a few years)
@Chad: Glad you got your Coco upgraded. By the way, is your coco one
of those ones that does NOT have Extended Color BASIC? If so, drop me
a line.
As for finding something to do with the Coco, remember that you've got
a good relay in the cassette port. You can measure voltages from 0 -
5V via the JOYSTK port(s) without any sort of fancy programming, and
you have a built-in D/A converter accessible out the back end of the
computer. Go figure. It's a great microcontroller.. Note that
doing JOYSTK conversions affects your D/A output....
- Aaron
On Mar 18, 2012, at 7:02 AM, haywire666 at aol.com wrote:
> I don't think you can ever go wrong maxing out any computers ram..
> So I didn't understand the varying opinions myself.
>
>
>
> -----Original Message-----
> From: Chad H <chadbh74 at hotmail.com>
> To: 'CoCoList for Color Computer Enthusiasts' <coco at maltedmedia.com>
> Sent: Sat, Mar 17, 2012 11:04 pm
> Subject: Re: [Coco] CoCo 2 16k.. Upgrade or no?
>
>
> Ok, I got some interesting comments on this thread but never
> anything like a
> opinion or recommendation equating to an answer to the question
> asked, so I
> said to hell with it and upgraded the thing to 64K. Surprisingly, I
> found
> the RAM was already socketed so that saved a lot of work.
>
> Here's the board... http://www.mediafire.com/i/?dre4zrt4j1h9ihd
>
> Now....to figure out what to do with it... hmmm.
>
> - Chad
>
> -----Original Message-----
> From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com
> ] On
> Behalf Of Aaron Banerjee
> Sent: Tuesday, March 13, 2012 8:21 PM
> To: CoCoList for Color Computer Enthusiasts
> Subject: Re: [Coco] CoCo 2 16k.. Upgrade or no?
>
> One of the best ways to find something is to announce publicly that
> you lost
> it:
>
>
> 5 FOR X=3584 TO 3609
> 10 READ D
> 15 POKE X,D
> 20 NEXT X
> 25 EXEC 3584
> 30 DATA 26, 80
> 35 DATA 142, 28, 0
> 40 DATA 166, 132
> 45 DATA 183, 255, 223
> 50 DATA 167, 128
> 55 DATA 183, 255, 222
> 60 DATA 140, 255, 0
> 65 DATA 38, 241
> 70 DATA 183, 255, 223
> 75 DATA 28, 175
> 80 DATA 57
>
> I think the above program means:
>
> ORCC $50
> LDX $8000 'START OF BASIC
> HERE LDA ,X
> STA $FFDF 'MAP TYPE 1 (64K)
> STA ,X+ 'COPY THE BYTE
> STA $FFDE 'GO BACK TO MAP TYPE 0 (32K)
> CMPX $FF00 'END OF BASIC AND CARTRIDGE MEMORY
> BNE HERE
> STA $FFDF 'NOW THAT YOU'VE GOT BASIC IN THE RAM,
> YOU CAN SAFELY SWITCH TO ALL-RAM MODE
> ANDCC $AF
>
> This is based on my hen-scratched notes from years ago.
> - Aaron
>
>
> On Mar 13, 2012, at 8:47 PM, Aaron Banerjee wrote:
>
>>
>> Type in PCLEAR 0 and see if the memory increases. Remember, a 16K
>> computer has 16K of actual RAM (locations 0 - 16383). A lot of that
>> is used up by BASIC (and the graphics screens). For 64K machines,
>> normally only 32K is available (locations 0-32767). There is a way
>> to
>> get it into 64K mode (an all-RAM machine) where you can go poke up
>> BASIC (lots of fun). I've actually posted the program that does
>> that to this list, and if I can find my notebook, I'll do it again.
>> Basically, it changes the "map type" back and forth while copying
>> over
>> the contents of BASIC. Once again, BASIC, cartridge memory, I/ O
>> memory, etc take up space, so you'll get no where near the 65536
>> bytes
>> implied by "64K."
>> - Aaron
>>
>>
>> On Mar 13, 2012, at 8:35 PM, haywire666 at aol.com wrote:
>>
>>> Thats interesting I don't remember the ?mem thing...
>>>
>>>
>>> Can someone provide a list of the #'s and what they mean?
>>>
>>>
>>> 8487 means 16k?
>>>
>>>
>>> I got 24871 on the coco2 I have on at the moment, does that mean it
>>> only has 48k?
>>>
>>>
>>> Steven
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: Chad H <chadbh74 at hotmail.com>
>>> To: 'CoCoList for Color Computer Enthusiasts' <coco at maltedmedia.com>
>>> Sent: Tue, Mar 13, 2012 8:31 pm
>>> Subject: [Coco] CoCo 2 16k.. Upgrade or no?
>>>
>>>
>>> Was just given a virgin CoCo2 26-3136.. It's apparently 16k, only
>>> shows 8487 from "?MEM". I already have a spare 64k CoCo, don't
>>> really need this one.
>>> I will probably put it up for sell. Question though.would it be
>>> better to leave it as is or perform a 64K upgrade to it? I already
>>> have enough spare RAM IC's and sockets and it already has ECB 1.1.
>>>
>>>
>>> --
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>>>
>>>
>>>
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