Topic: C65 compatibility?

I just noticed this website http://mega65.org/ where the C65 is rebuild in an fpga.

Might be interesting to contact them to include compatibility for the FPGA Arcade?

Re: C65 compatibility?

We have our own C64 with extra goodies!

Re: C65 compatibility?

65, not 64. Sometimes 1 is a very big difference. In this case many thousands of dollars on the used market.

4 (edited by Lizard 2015-04-24 13:26:07)

Re: C65 compatibility?

@Mike: Check http://en.wikipedia.org/wiki/Commodore_65 The C65 was the successor of the C64, but it never left protoype status. After Commodore went bankrupt the units were sold.

http://upload.wikimedia.org/wikipedia/commons/thumb/5/5e/C65.jpg/1024px-C65.jpg

Re: C65 compatibility?

Yep, a handful of pre-production prototypes were made.  The 1581 was built into what was basically the original C64G case.  I don't think the firmware was ever finished though.  I am not sure if Bill Heard worked on this, or Dave Haynie.  I will ask Dave.

Re: C65 compatibility?

This mega65 webpage looks strange... This page is better, with technical info: http://c65gs.blogspot.com.au/?m=1

And it uses this code: https://github.com/gardners/c65gs

/WoS

Re: C65 compatibility?

Hello,

Lizard wrote:

I just noticed this website http://mega65.org/ where the C65 is rebuild in an fpga.

Might be interesting to contact them to include compatibility for the FPGA Arcade?

I have no objection to the MEGA65 being adapted for the FPGA Arcade.  However, be aware that the design currently requires a large Xilinx 7-series FPGA, as it uses BRAM for the main memory.  It should be feasible to adapt it to a 6-series Spartan if you cut the functionality down to real C65 level, although it might take quite a bit of work.

Paul.

Re: C65 compatibility?

Paul, great to hear from you.
Very kind, thank you.
I had a quick look at the your code, certainly looks feasible to use our DRAM and IO framework around your core.
Cheers,
Mike

Re: C65 compatibility?

C65 core would be awesome!

@ JimDrew:
There is no 1581 in the C65. It uses a custom CSG F011 Floppy Disk Controller for the "Fast Serial Bus" (internal drive). There was also the Option of an external Fast Serial Drive, called 1565, which had a small custom 4101 Interface chip. Only 3 external drives (two with cases, one board only) where ever made as far as I know of today.

No, work was done by:
Fred Bowen: System Software
Paul Lassa: Hardware engineer-  C65, DMAgic
Bill Gardei: LSI engineer-  4567, FDC 
Victor Andrade: LSI engineer- 4510 


Hope that helps.

10

Re: C65 compatibility?

Any SW for that to run? Just a core running its own basic/kernel sound a bit boring... tongue

/WoS

11

Re: C65 compatibility?

there is almost no software for it (the demo disks, and one or two scene demos) and that doesnt even work on all C65s (they are all prototypes, each a little bit different to the next) - which is pretty much the reason why noone bothered to implement a proper C65 emulator either.