[Coco] Coco 2 with Color BASIC 1.3

[Bob Devries]

I have some Korean Coco2's here also.

They were originally fitted with 16K using two 4416 chips. These chips could 
be swapped with two 4464 chips, the same as used in the 128K Coco3. As well, 
the Coco2 could be upgraded to 64K using the daughter board which has 8 4164 
ram chips.

the 64/128K jumpers referred to the BASIC ROM/EPROM.; 64 for an 8K ROM 
(usually Color Basic 1.3) and 128K for a 27128 type which included Extended 
Color Basic in the upper half of the ROM.

I got my first Coco3 by upgrading about a dozen Korean Coco2's from 16k to 
64k for a local Tandy store who wanted to offload the Coco2's quickly, since 
the Coco3 was "just 'round the corner'. I upgraded them using 4464 chips, 
which were at the time very cheap.

Regards, Bob Devries
Dalby, QLD, Australia

----- Original Message ----- 
From: "Kip Koon" <computerdoc at sc.rr.com>
To: "'CoCoList for Color Computer Enthusiasts'" <coco at maltedmedia.com>
Sent: Saturday, April 27, 2013 4:36 PM
Subject: Re: [Coco] Coco 2 with Color BASIC 1.3


> Ben,
> I just found the exact same model number Coco 2 - 26-3134B in storage, so 
> I
> opened it up to see what was in it.
> Mine has an eprom with Extended Color Basic 1.1 installed.  The four 
> jumpers
> are soldered in the 128K position.
> As far as I can tell, changing the four soldered jumpers from 64K to 128K
> that are at the end of the Color Basic 1.3 rom socket and replacing the
> Color Basic 1.3 rom with a 27c128 eprom with Extended Color Basic 1.1 rom
> image burned in it should be all you need to get Extended Color Basic 1.1
> running on your Korean Coco 2 computer.
> My Korean Coco 2 also has just two memory chips in it and when I issue the
> Basic command "?MEM", I get 24871 bytes free.  When I issue the "PCLEAR1"
> Basic command, and then the "?MEM" command again, it displays 29479 bytes
> free.
> So I would say if you get the same results, you can be pretty sure you 
> have
> 64KBs of ram memory in your Korean Coco 2.  Mine has the two white 
> expansion
> single row sockets for a daughter board also, but no expansion board is
> installed.
> If you need an eprom burnt for your Coco 2, I'd be happy to help you with
> that.  Now that I have found a Korean Coco 2 in my storage, I can actually
> test the eprom before I ship it.  Send me a private email and let me know
> the details.
> Kip
>
> -----Original Message-----
> From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] 
> On
> Behalf Of Ben
> Sent: Friday, April 26, 2013 8:31 PM
> To: coco at maltedmedia.com
> Subject: Re: [Coco] Coco 2 with Color BASIC 1.3
>
> Ben <ben_jimenez at ...> writes:
>
>
>>
>> Hi,
>>
>> I just got my Coco 2 connected to my tv, it boots up to COLOR BASIC
>> 1.3
>> (C) 1982 TANDY
>>
>> My first question is, how much memory does it have? the label does not
> state
>> this.
>>
>> I tried pmode, and pcls, and screen commands and they don't seem to
>> work I
> get
>> a SN error.
>>
>> Just some questions. thanks.
>>
>> Ben
>>
>> --
>> Coco mailing list
>> Coco at ...
>> http://five.pairlist.net/mailman/listinfo/coco
>>
>>
>
> Looked up the model number on this coco 2 and found this
>
> 26-3134B
>
> This is the last Korean 16K Color BASIC model. It uses the #20261058 
> circuit
> board, which is similar to the #20261044 board. It uses two 4416 RAM chips
> and a 24-pin Color BASIC 1.3 ROM in a 28-pin socket as well. However, in
> addition to the 4416/4464 sockets and special daughterboard connectors,
> there are pads on the board allowing direct factory installation of eight
> 4164 chips. This is also the board which contains the newer 6847T1 VDG 
> chip
> (which is not pin-compatible with the earlier 6847).
>
> so it can be updated to extended basic and 64k memory? is this stuff still
> out there? if so where could one find this?
>
>
>
>
>
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>
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