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Message |
Forum: General Discussions Topic: 65RISC-V |
| wayfarer |
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Posted: Thu May 04, 2023 7:03 pm
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Replies: 11
Views: 4145
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| ... (through custom instructions) to run some piece of code somewhere in memory seems like a good alternative. also, personally i wouldn't bother with 65832 compatibility, as it's just a 65816 with 32-bit registers and no other redeeming qualities or software that made use of it. anyways i'd be interested ... |
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Forum: General Discussions Topic: 65RISC-V |
| Proxy |
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Posted: Wed May 03, 2023 6:35 pm
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Replies: 11
Views: 4145
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| ... (through custom instructions) to run some piece of code somewhere in memory seems like a good alternative. also, personally i wouldn't bother with 65832 compatibility, as it's just a 65816 with 32-bit registers and no other redeeming qualities or software that made use of it. anyways i'd be interested ... |
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Forum: General Discussions Topic: 65RISC-V |
| wayfarer |
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Posted: Mon May 01, 2023 7:31 pm
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Replies: 11
Views: 4145
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| ... correctly, a RISC-V implementation with a 'user extension', that is operationally compatible with the 6502, 65816 and ideally, the never released 65832, or versions for each thereof. I would restrict any other extensions to RISC-V at this level as a package much like the existing nomenclature. ... |
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Forum: Hardware Topic: 65832 datasheet |
| Proxy |
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Posted: Sat Apr 29, 2023 3:51 pm
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Replies: 9
Views: 2720
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| ahhh the dreams of a 32-bit 6502 CPU. i have been working every now and then on a draft for my own flavor of 32-bitness. re-reading the 65k project pages, i can see some similarities here and there. but i think my design is distinct enough to not be called a copy... for example my design does have a... |
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Forum: Hardware Topic: 65832 datasheet |
| wayfarer |
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Posted: Wed Apr 26, 2023 3:56 am
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Replies: 9
Views: 2720
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| ... I have looked briefly at a few of the 65x+32 projects out there. I have read through the 65832 datasheet and around this board 'some'. Because this topic is kinda hot and this is as good a place as any to jump in, I want to discuss a few ... |
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Forum: Hardware Topic: 65816 Data/Bus Pins. |
| GARTHWILSON |
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Posted: Wed Mar 29, 2023 3:24 am
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Replies: 24
Views: 2018
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| ... for the '816 to be able to run '02 code however seems to have kept the '816 from being as good as it could have been. WDC designed the 65832 also, apparently for such a market, but Apple went to the 68000, so the 65832 was never made. The '832 had an 8-bit data bus. Someone asked ... |
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Forum: Emulation and Simulation Topic: 65816 Logisim Project |
| Sheep64 |
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Posted: Sat Jul 09, 2022 4:44 pm
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Replies: 55
Views: 41555
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| ... display may partially fail. This is an annoying corner case and extra circuitry for 65816 is likely to be insufficient for a hypothetical 65832. There is a common pattern here: draw everything twice or draw everything slowly so it can be sampled twice. We also have the problem that reads ... |
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Forum: Hardware Topic: 65816 EMU Pin and WS2812B Digital LEDs |
| Sheep64 |
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Posted: Mon Oct 11, 2021 9:37 am
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Replies: 33
Views: 2724
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| ... cycle. However, if you depend upon such undocumented functionality then your design may not be upward compatible. For example, if a hypothetical 65832 became available and 65816 chips were derived from the same manufacturing process then EMU pin functionality may change quite drastically. Such ... |
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Forum: Emulation and Simulation Topic: Yet another 65xxx bit of wishful thinking... |
| Sheep64 |
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Posted: Mon Feb 22, 2021 1:32 pm
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Replies: 25
Views: 15334
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| There are at least 10 groups who have proposed a 32 bit extension or larger. This would include 65k, 65000, 65020, 65GZ032 , 65Org32 , 65832 , 65E4 , 65m02 and tentative steps separately from Proxy and I to extend 65CE02. It is apparent that many of the proposals have common themes and they ... |
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Forum: Hardware Topic: PC/ISA 65832 computer |
| Rob Finch |
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Posted: Mon Aug 31, 2020 3:34 am
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Replies: 9
Views: 1587
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Yes, it is a KiCAD schematic. Thanks for the suggestion, I was able to plot a monochrome image of the board schematic so far. I still need to add RAM, ROM, and a uart to make it a SBC.
Attachment:
File comment: ISA65816 Schematic
ISA65816.pdf [222.99 KiB]
Downloaded 81 times
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Forum: Hardware Topic: PC/ISA 65832 computer |
| Alarm Siren |
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Posted: Mon Aug 24, 2020 7:34 am
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Replies: 9
Views: 1587
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| (Sorry about the color, I haven't figured out how to get the CAD program to output mono.) It looks to me like you took a screenshot of the Kicad schematic window? If you instead go to File -> Plot, you can create a PDF of the schematic, and one of the options is "Output mode" (Color | Bla... |
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Forum: Hardware Topic: PC/ISA 65832 computer |
| Rob Finch |
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Posted: Fri Aug 21, 2020 12:09 pm
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Replies: 9
Views: 1587
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| Spent some time studying and coming up with a circuit interfacing interrupts for an '816 processor. In emulation mode interrupts are handled via ROM vectors as normal. The interesting part occurs for interrupts handled in native mode. The encoded interrupt level (one of sixteen) is used to form part... |
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Forum: General Discussions Topic: Would a 32 bit evolution of 65816 stay accumulator based? |
| John West |
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Posted: Tue Aug 11, 2020 11:18 am
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Replies: 23
Views: 3843
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| Would a 32 bit evolution of 65816 stay accumulator based? In one sense, that question has already been answered by the 65832, and the answer was "yes". You could take the fate of that design as an indication that this was the wrong answer. The industry as a whole as taken ... |
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Forum: Hardware Topic: PC/ISA 65832 computer |
| Rob Finch |
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Posted: Sun Aug 09, 2020 2:53 am
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Replies: 9
Views: 1587
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| Mapped out the bus signals onto the FPGA board signal lines. It turns out significantly more FPGA I/O’s are available than I though initially. I was able to map all the bus signals using separate signal lines for IRQ’s and DRQ’s. This is good because it will simply things. There are some signal line... |
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Forum: Hardware Topic: PC/ISA 65832 computer |
| Rob Finch |
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Posted: Wed Aug 05, 2020 6:25 am
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Replies: 9
Views: 1587
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| After last night’s diversion, I started working on the bus interface unit for a 64-bit core. Everything for this project seems to be revolving around the bus at the moment. With a good bus interface unit, a number of different processing cores could be interfaced. It’s somewhat tricky as the interfa... |
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