[Coco] Memory size of Coco 2

[Bruce W. Calkins]

In the early days they expected to use "half-good" 64k chips for the 32k 
upgrades.  The cost savings of that did not pan out.  The "F" board coco 
1 was jumpered for all good 64k chips.  The "D" and "E" boards had 
jumpers for mapping the upper or lower banks for 32k.  You needed to 
wire in a gate on a 74LS02 to access both halves of the 64k chips.
Bruce W.




p
On 08/13/2018 03:00 AM, L. Curtis Boyle wrote:
> The Coco 2, no. That was strictly 16K and 64K (and with or without Extended BASIC). The Coco 1 did, however, have a 32k option. (Even though it was usually a full 64K - which is why they later replaced it with an “official” 64k upgrade).
> L. Curtis Boyle
> curtisboyle at sasktel.net
> 
> 
> 
>> On Aug 13, 2018, at 12:10 AM, Andrew <keeper63 at cox.net> wrote:
>>
>> I'm going to defer to your expertise, since I was a kid when I had my CoCo 2. What I recall about it was that it came with 16K - but at some point I got an upgrade to 32K, then later again to 64K.
>>
>> So the 32K was just an upgrade - they never sold it with that amount?
>>
>> On 08/12/2018 10:16 PM, coco-request at maltedmedia.com wrote:
>>> Message: 4
>>> Date: Sun, 12 Aug 2018 19:34:50 -0600
>>> From: "L. Curtis Boyle"<curtisboyle at sasktel.net>
>>> To: CoCoList for Color Computer Enthusiasts<coco at maltedmedia.com>
>>> Subject: Re: [Coco] Memory size of Coco 2
>>> Message-ID:<8180C78D-8D67-43D8-81B4-91D0F030209D at sasktel.net>
>>> Content-Type: text/plain;	charset=us-ascii
>>> The Coco 2 was only offered in 16K and 64k.
>>
>> -- 
>> Andrew L. Ayers
>> Glendale, Arizona
>> https://github.com/andrew-ayers
>>
>> -- 
>> Coco mailing list
>> Coco at maltedmedia.com
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>>
> 
>