| Author |
Message |
Forum: Hardware Topic: 65816 EMU Pin and WS2812B Digital LEDs |
| Sheep64 |
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Posted: Tue Sep 28, 2021 5:04 pm
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Replies: 33
Views: 2722
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| I'm disappointed that very few people use a 65816's MX or EMU pin. I presume that Bill Mensch is more disappointed. The MX pin provides a 65816's two modal 8/16 bits during each clock phase and is intended to extend functionality, for example, ... |
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Forum: Programming Topic: psABI for w65 (65816) |
| InfernoDeity |
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Posted: Tue Sep 21, 2021 1:07 am
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Replies: 7
Views: 1612
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| As part of a project to allow development of SNES Homebrew using higher level languages, I have developed a psABI (Processor Specific ABI) for the w65 (WDC 65C816) architecture. The ELF sections of the ABI are implemented in a fork of binutils, https://github.com/SNES-Dev/binutils-gdb, which contain... |
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Forum: Programming Topic: Calypsi C compiler toolchain for 6502 and 65816 |
| hth313 |
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Posted: Tue Aug 03, 2021 4:32 pm
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Replies: 81
Views: 8212
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| I have just released C compilers that may interest this community. Highlights: ⋅ ISO C 99 compiler for either 6502/65C02 and WDC 65816. This is a freestanding implementation with many features you will typically find in a hosted compiler. ⋅ Fully reentrant code model. ⋅ ... |
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Forum: Hardware Topic: New 65816 design with expansion bus for video |
| jmthompson |
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Posted: Wed Jul 14, 2021 8:23 pm
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Replies: 27
Views: 1057
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| ... early design phases on this project I want to get some input and advice before I get too far long. My initial specs look something like this: - 65816 CPU, initially 4 MHz, with plans to go faster down the road - 1 MB of RAM (2 x AS6C4008-55) - Either a flash ROM, or loading bootloader from a ... |
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Forum: Newbies Topic: Got two 65816 instead of 6502 by mistake: advice needed. |
| tokafondo |
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Posted: Tue May 25, 2021 12:16 pm
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Replies: 7
Views: 950
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| I ordered two 6502 chips from Europe's WDC partner and received two 65816 chips. So much has been told about the 816's advantages when programming. But hardware wise, maybe it's not the same. And I'm talking about use them in emulation mode all the time. Is ... |
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Forum: Hardware Topic: Memory expansion for 65816 |
| Ruud |
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Posted: Mon May 24, 2021 9:12 am
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Replies: 15
Views: 947
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| I just ordered a PCB of my first own 65816 project. It has 1 MB of SRAM on board and I'm still working on its BIOS. But I'm thinking of the future already where I could need more than 1 MB of RAM. I came up with three possibilities and of two ... |
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Forum: Hardware Topic: Would a 16 bit data bus make the 65816 address only 8MB? |
| tokafondo |
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Posted: Mon May 03, 2021 7:48 am
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Replies: 12
Views: 586
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| 16 bit values are AFAIK stored as two consecutive 8 bit values... |
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Forum: Programming Topic: What about a 65816 port of Minix? |
| tokafondo |
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Posted: Wed Mar 24, 2021 12:40 am
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Replies: 16
Views: 1671
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| After checking that porting Coherent to the 65816 would be a daunting tasks, I searched for another unix-like OS to be ported to the 65816. I found the Amiga 500 port of Minix. As the Motorola 68000 was certainly closer to the 65816, by having ... |
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Forum: Programming Topic: What about a 65816 port of Mark Williams's Coherent? |
| tokafondo |
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Posted: Sun Mar 21, 2021 7:01 pm
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Replies: 15
Views: 1066
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They say it's easy to port. There are versions for x86, 68k, z8000 and even 6809. It requires no MMU or FPU.
And the sources are available and open.
Would an existing C compiler be able to get this done? |
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Forum: Newbies Topic: Want to build a 65816 system |
| nbrok |
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Posted: Sat Mar 06, 2021 7:51 am
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Replies: 4
Views: 586
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| Hello, I'm Nick and have a lot of experience building 68xx and Z80 microcomputers. I found a 65C816 while cleaning up my hobby-room. I tried to design a schematic that should give a working computer, but after reading some posts in this forum I am confused. I think it will not work at all. See attac... |
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Forum: Programming Topic: copy data between banks on 65816 |
| fachat |
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Posted: Mon Jan 25, 2021 6:38 pm
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Replies: 8
Views: 782
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| I am looking for a fast way to copy a variable amount of data between two banks (basically like a file read or write) on the 65816. I am not sure I fully understand how the DBR works, but as I read it, consecutive reads/writes would all go to the same bank, except if I change the DBR ... |
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Forum: Hardware Topic: 65816 and RDY problems |
| fachat |
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Posted: Mon Jan 18, 2021 11:08 pm
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Replies: 12
Views: 1060
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| Hi there, I have built my Micro PET and I wanted to switch from stretched phi2 clock to RDY-based wait states, so the VIA timers count a regular clock, not the stretched clock. It runs fine with RDY output, and stretched clock - only when I switch stretched to normal clock, it stops working. My assu... |
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Forum: Hardware Topic: Grid Computing With 6502, 65816 And/Or 65265 |
| Sheep64 |
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Posted: Wed Dec 30, 2020 10:23 am
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Replies: 13
Views: 1082
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| ... This is especially desirable if multiplexed RAM is supplied in large quantities. However, this arrangement may reduce communication speed. With 65816 or 65265, it is possible to have 64KB or more per uni-directional channel. It is also possible to block copy to and from buffers. Or, indeed, ... |
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Forum: Programming Topic: How to demonstrate advantages of 65816? |
| BigEd |
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Posted: Fri Nov 13, 2020 8:05 pm
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Replies: 31
Views: 3300
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| The beeb816 project puts a fast 65816 into a BBC Micro. It brings several benefits even in 6502 mode: speed, and paged RAM, and shadowing of video RAM. But it has 512k of fast RAM, so there's plenty unassigned, and it can be put into 65816 ... |
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Forum: Programming Topic: 6502/65816 and T6963C/RA6963 Graphic LCD |
| xjmaas |
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Posted: Tue Sep 29, 2020 6:25 pm
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Replies: 3
Views: 739
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| Does anyone have some text/graphics routines at hand for the 65(c)02/65816 for a graphic LCD with a T6963C or RA6963 controller I may use? I am experimenting with a Winstar WG12864D module with my SBC and can print some words (actually one right now: TOSHIBA) ... |
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