[Coco] "New" Coco 1 with keyboard and composite adapter

[Luis Antoniosi (CoCoDemus)]

You mean to replace the opamp ?

Just replace the LM741 IC for any of these:

http://www.petervis.com/Education/741_Pin_Compatible_Equivalent_Op_Amps/741_Pin_Compatible_Equivalent_Op_Amps.html

I use the TL081 and it works like a charm.


Luis Felipe Antoniosi



On Fri, Mar 13, 2015 at 10:40 AM, Al Hartman <alhartman6 at optonline.net>
wrote:

> That's not an HJL. I think it's a Keytronics MB-500. And, I've peeked
> under the shield as it had come loose in shipping, and the Extended BASIC
> is a ROM, not an EPROM.
>
> I want to put the mod into all three Coco I computers for the faster
> Drivewire. Can someone tell me what that is?
>
> -[ Al ]-
>
> -----Original Message----- From: Robert Hermanek
>
> Did you find that computer with the composite adapter already in it, and
> the custom keyboard?  (What was it called, HJL?  JHL?  Can't remember).
> I'm always on the look out for my original color computer I lost track
> of 25 years ago, which had aforementioned keyboard, a home brew
> composite adapter, which would make machine pretty unique.  And I've
> mentioned this next bit before also:  The computer had a flawed burn of
> extended basic, so the MID$ statement (not function) would fail.  So for
> example the following test program would hang the machine:
>
> 10 A$="HALLO"
> 20 MID$(A$,2,1)="E"
> 30 PRINT A$
>
> If the program completes, it is someone else's long lost coco.  If it
> hangs on line 20, you're working with an old machine of mine :)
>
> -RobertH
>
> --
> Coco mailing list
> Coco at maltedmedia.com
> https://pairlist5.pair.net/mailman/listinfo/coco
>