RE: C16/Plus4

In fact at that time, many TV set where PAL/SECAM but in most of the TV the PAL was disabled
By a strap or a missing chip.

For the hackers it was possible to open the TV remove /add the strap and get a PAL/SECAM tv

There was no document on this modification and It was impossible to ask the client to open its
TV and rummage inside :)

SECAM for C64  (from this web site)  http://mpc.fab.free.fr/commodore/pvic20.htm 

Computer opened with the secam board visible.
http://mpc.fab.free.fr/commodore/photo8bits/vic20ouvert.jpg 

SECAM board added in VIC 20 / C64
http://mpc.fab.free.fr/commodore/photo8bits/vic20procepcarte.jpg 

the first version was just a transistor to invert the pal signal (added in the modulator)
so it was possible to have a black and white image (ugly)  [prototype]

later this prototype was improved and sold with the VIC20

then came a PAL/SECAM converter, a huge box almost as thick as a C64 but flat so the c64
could be placed on top. (no images) (colors but bad quality)

then this board was made such a way it could be fixed inside the C64

secam boards found on this web site: http://www.c-64.org/de/hardware2.html


btw: I worked for procep from 1981 to 1985..

--
didier

-----Message d'origine-----
De : owner-cbm-hackers@musoftware.de [mailto:owner-cbm-hackers@musoftware.de] De la part de Anders Carlsson
Envoyé : lundi 31 octobre 2011 11:40
À : cbm-hackers@musoftware.de
Objet : Re: C16/Plus4

Didier Derny wrote:

> In 1984/1985 it was a problem, no room left to insert a quite large pal to 
> SECAM interface.

On the topic of SECAM, is it true that a C64 equipped with PAL to SECAM 
interface outputs a worse RGB picture than what S-Video would do on a PAL 
monitor?

Perhaps if the TED chip had built-in RGB output, it would have been more 
popular in France etc, but then again on a cheap low-end European market, 
not too many users in 1983/84 would have a TV with RGB SCART input anyway.. 
at least not outside France. However it is true that e.g. Acorn Electron has 
a TTL RGB output just like its big brother, the BBC Micro. For some reason, 
I consider the Commodore 16 and Acorn Electron classmates in terms of 
release date, capacities and relation to more expensive machines (Commodore 
64 and BBC Micro, although of course the Plus/4 is more directly a big 
brother to the C16).

Best regards

-- 
Anders Carlsson


       Message was sent through the cbm-hackers mailing list


       Message was sent through the cbm-hackers mailing list