Introducing the Commodore MultiPET
I recently took my 40/80 column switchable motherboard (using the Comspec clone from Steve G) and modified it with the following capability
(why you may ask - well why not )
(1) standard 4032 with a SuperSoft HR-40 high resolution graphics card. Changeable character rom (change is software selectable via programming the user port) so can play the HAL games etc.
(2) standard 8032 (changeable character rom)
(3) SuperPet using the graphics keyboard (excluding the APL) working in both 80 column and also 40 column modes
https://www.flickr.com/photos/138413...57719645686589
i haven’t uploaded pics here as there is a file size limit.
I recently took my 40/80 column switchable motherboard (using the Comspec clone from Steve G) and modified it with the following capability
(why you may ask - well why not )
(1) standard 4032 with a SuperSoft HR-40 high resolution graphics card. Changeable character rom (change is software selectable via programming the user port) so can play the HAL games etc.
(2) standard 8032 (changeable character rom)
(3) SuperPet using the graphics keyboard (excluding the APL) working in both 80 column and also 40 column modes
- Needed to create custom edit roms for the 4032/8032 so it could switch between 40-col and 80-col displays, whilst still being able to use the high res board.
- New character roms to include the superpet rom. The Supersoft HR board works with inverse logic so all the bits in the character rom had to be inverted.
- Modify the SuperPET rom (D) so the keyboard mapping would work with the graphics keyboard (excl APL)
- Modify the SuperPET roms (C & D) so they can switch between 80 and 40 column modes
- I left the APL keyboard mapping alone as this is quite involved for little return (I have not used the APL code on the SP)
- Modify the Waterloo languages to work in 40 column mode (not fully tested)
- Added a reset switch so you can change modes easily.
- I used Steve G’s multirom board to select different character roms
- I used Jim B (Retro Innovation) 23xx adapters for a switchable editor rom and also switchable ROMs C and D for the SuperPET (40/80 col)
https://www.flickr.com/photos/138413...57719645686589
i haven’t uploaded pics here as there is a file size limit.
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