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| 65816 softcore? http://forum.6502.org/viewtopic.php?f=10&t=5587 |
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| Author: | kakemoms [ Mon Mar 25, 2019 7:40 am ] |
| Post subject: | 65816 softcore? |
Hi! I have been looking through the different 16-bit versions of the 6502 (or the effort to make such), but I still haven't found anyone trying for complete 65816 compatibility. Is there such a thing out there? I know about the VeriSNES and the official WDC softcore, but the first is unavailable and the second is too expensive. Typically! After posting this, I found the MiSTer SNES which has a 65C816 core in VHDL: https://github.com/MiSTer-devel/SNES_MiSTer/tree/master/src/65C816 Which is a port of the Japanese original: https://github.com/srg320/FpgaSnes/tree/master/FPGA/65C816 (his web page is here, but in japanese) |
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| Author: | BigEd [ Mon Mar 25, 2019 8:41 am ] |
| Post subject: | Re: 65816 softcore? |
Good find, and something to keep an eye on. I see 1000+ lines of microcode, and I see a recent update tweaking a dozen of those lines. As has been noted before, a testsuite can work wonders, but it's a lot of work to put together. |
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| Author: | kakemoms [ Tue Mar 26, 2019 7:41 am ] |
| Post subject: | Re: 65816 softcore? |
BigEd wrote: Good find, and something to keep an eye on. I see 1000+ lines of microcode, and I see a recent update tweaking a dozen of those lines. As has been noted before, a testsuite can work wonders, but it's a lot of work to put together. That is true. But it does run SNES code.. which was based on the original WDC? Or was it a modified core? |
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| Author: | BigEd [ Tue Mar 26, 2019 9:07 am ] |
| Post subject: | Re: 65816 softcore? |
I think the SNES core isn't modified - it seems that MESS uses the same code to emulate the SNES and the IIgs. https://github.com/mamedev/mame/blob/ma ... g65816.cpp (There is SNES-specific modelling of the memory banking and the multiply/divide widget and the bus timing, I think, but those are not differences in the core.) |
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| Author: | Rob Finch [ Wed Mar 27, 2019 4:27 am ] |
| Post subject: | Re: 65816 softcore? |
Have you tried the FT816 core? It's not 100% cycle compatible, but it's close, It's been used successfully in this project: http://atariage.com/forums/topic/277736 ... s-a-65816/ |
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