Re: ROM 901225-01 and CBM-II series

From: Marko Mäkelä (
Date: 2006-07-26 08:46:52

On Wed, Jul 26, 2006 at 04:36:16AM +0000, William Levak wrote:
> Anders Carlsson wrote:
> >Would the application software (that I don't have) somehow utilize the
> >character ROM in the cartridge as a copy protection? That is my best
> >guess, and that Commodore/Handic used a ROM chip they had plenty of.
> That is a possibility, but I can think of others:
> The cartridge could work in a mode where the onboard character set is 
> swithched out, in which case it would need to supply another character 
> set.

Isn't the character cell something like 8 by 13 pixels on the CBM 600 and 700
series (B series)?  Only the P500 (CBM 500) is equipped with a VIC-II chip
(8 by 8 character cell matrix).

> I have seen some Commodore equipment that had random ROM's inserted in 
> sockets, just to fill the empty socket.  I have no explanation of why they 
> felt they could not leave the socket empty.

They could have drilled holes on the circuit board, like on some PETs to
prevent a RAM expansion, couldn't they? :-)

> >Besides, does anyone know if there are autostarting cartridges for the
> >CBM-II series, or do all require disk software and the cartridge only
> >fills an auxillary function?

There might have been a cartridge containing cassette routines.  Has anyone
come across it?


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