[Coco] CoCo VGA Adapter

[Little John]

When I first hooked it up with the faster Crystal - I got a perfectly stable 
picture, it was just off the top left of the screen. Using the monitors 
Horizontal & Vertical position controls I just moved the image until it was 
almost centered (it wouldn't perfectly center, but it was close enough 
horizontally). Vertically it was still off the top of the screen a bit (but 
readable) so I adjusted the VGA adapter (it comes with instructions for the 
available adjustments which are inside the unit). Chances are, you'll be 
able to get by simply by adjusting the hor/vert position and width/height 
controls on the monitor (the monitor I am using is an OLD GoldStar and 
doesn't have any of the advanced adjustments available on newer units).

Important to note, using the faster crystal will not allow you to load from 
tape programs that were saved with the previous crystal (i.e. all standard 
coco tapes) and the bit banger baud constants will need to be adjusted. 
Although I haven't tried it, this will probably affect the functionality of 
drivewire as well since it is geared for the standard crystal. I socketed my 
crystal and made a jumper selectable crystal board that has 28.475Mhz (PAL), 
28.63636 Mhz (NTSC), 32Mhz and 40Mhz crystals (40Mhz not tested yet, but 
unlikely to function - it would result in 2.5Mhz speed at poke 65497,0 - the 
syncs would likely be too far out of whack for the converter to sync to).
----- Original Message ----- 
From: "Wes Gale" <wgale at magellaninteractive.com>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Tuesday, November 09, 2010 12:12 PM
Subject: Re: [Coco] CoCo VGA Adapter


>  I was wondering about this.  I just ordered one too (I think it is stuck 
> at the border/customs).
>
> What exactly did you have to change with the monitor (through the VGA 
> interface) to get it working with the faster crystal?  I was planning to 
> use it with an LCD monitor.
>
> Wes
>
>
> On 10-11-09 10:01 AM, Little John wrote:
>> I agree - I have two of these I bought used. I have been able to get them 
>> to work with my CoCo 3 using a 32Mhz crystal (1Mhz/2Mhz) operation - some 
>> adjustment of the monitor controls was required, but these things still 
>> synced to the modified timings caused by switching to a 32Mhz crystal.
>> JohnT
>> ----- Original Message ----- From: "Bruce James" <kb8kac at yahoo.com>
>> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
>> Sent: Tuesday, November 09, 2010 11:57 AM
>> Subject: [Coco] CoCo VGA Adapter
>>
>>
>>> Hi everyone,
>>> I just bought one of  Roy Justus's Coco Rgb to vga adapter.
>>> I ordered mine and had it in 2 weeks really fast shipping...
>>> this thing works great and is one of the best things
>>> I have done for my beloved Coco3.
>>> I would suggest this to any budding coco3 user...
>>> Bruce kb8kac
>>> I found this older link the price is 68.00 now...
>>> http://miba51.com/CoCo_VGA_Adpater.html
>>>
>>>
>>>
>>>
>>>
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>>> Coco at maltedmedia.com
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>>
>>
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>
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