Página 1 de 1
Commodore Plus4
Publicado: 20 Dic 2016, 13:15
por bakoulis
Just I wonder.
After the VIC-20, PET and of course the great C64 core, there is any plan for a Commodore +4 core?
Re: Commodore Plus4
Publicado: 20 Dic 2016, 14:08
por BCH
The TED chip is already implemented:
https://hackaday.io/project/11460-fpgated
Actually seems the plus/4 is implemented:
Current focus is on creating a Plus4 version for Papilio Pro FPGA board. These are the statuses of my progress
1. SDRAM controller for FPGATED using Papilio Pro's onboard sdram. Ready.
2. Bootstrap to load ROM files from flash chip to sdram on startup. In progress.
3. Implement Hannes/Csory ram expansion, plus develop new RAM extension method. Planned.
The SDRAM controller works perfectly and makes use of the whole 8MB RAM of the Papilio Pro board. 4MB will be available as RAM for TED and 4MB for alternative ROM images (Original Kernal/Basic, Jiffy DOS, Function ROMS, Cartridge ROMS).
I will release next code when point no 2 is done. Hopefully soon so come back to see.
Istvan
Re: Commodore Plus4
Publicado: 20 Dic 2016, 15:00
por Uto
AFAIK the C64 core uses the whole FPGA space, so if that requires adding something else I bet it won't be easy.
Re: Commodore Plus4
Publicado: 20 Dic 2016, 15:17
por BCH
As I understand, its a Plus/4 implementation for the Papilio Pro Board (same FPGA as the zx-uno), so it should fit. The problem porting it to the ZX-UNO could be the core uses the 8MB SDRAM on-board of the Papilio.
Re: Commodore Plus4
Publicado: 20 Dic 2016, 15:23
por bakoulis
Uto escribió:AFAIK the C64 core uses the whole FPGA space, so if that requires adding something else I bet it won't be easy.
The plus4 core have nothing to do with c64 core. Would be 2 different and independent cores. So the whole FPGA can used for plus4 core.
Re: Commodore Plus4
Publicado: 20 Dic 2016, 18:37
por Uto
bakoulis escribió:Uto escribió:AFAIK the C64 core uses the whole FPGA space, so if that requires adding something else I bet it won't be easy.
The plus4 core have nothing to do with c64 core. Would be 2 different and independent cores. So the whole FPGA can used for plus4 core.
Oh sorry, somehow I understood you were toalking about C64C, my bad!
Re: Commodore Plus4
Publicado: 15 Feb 2017, 23:04
por Scooter
En principio el plus+ debería de ser más simple que el c64; el procesador es prácticamente idéntico pero el TED es más sencillo que el VIC+SID a los que sustituye.
La RAM y la ROM es la misma. La misma de tamaño, no de contenido.
Y la decodificación parecida de complicación
Enviado desde mi 5056D mediante Tapatalk
Re: Commodore Plus4
Publicado: 15 Feb 2017, 23:53
por bakoulis
I hope someone who have the skills, will develop a +4 core to the short future.
At my opinion, the +4 core is simpler than the c64 core, but as well have lower interest for ZX1 users and developers.
The VIC-20 core is not as attractive like the c64 core, but it is much more simpler than c64 and +4 and that's why was the first Commodore core which developed.