| Author |
Message |
Forum: Forth Topic: Highly optimized 65816 ITC Forth |
| IamRob |
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Posted: Tue Feb 22, 2022 9:42 am
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Replies: 68
Views: 21722
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| ... my questions and contributed code snippets and offered their experience, expertise and advice. With the most gratitude going to Leepivonka for his 65816 source of FigForth and Mike for getting me started in the right direction with his efficient code snippets. I have made a lot of progress and ... |
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Forum: Forth Topic: KEGS IIGS 65816 emulator with partial VOC support |
| IamRob |
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Posted: Fri Feb 11, 2022 8:33 pm
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Replies: 0
Views: 18666
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| ... to display up to 128 characters x 48 lines in monochrome mode. Try it out now and give Kent your support. I will be extending my version of 65816 Forth to take advantage of the expanded screen. MacOSX version only OSX 10.13 and up required http://kegs.sourceforge.net |
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Forum: Hardware Topic: 65816 realistic maximum load |
| banedon |
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Posted: Tue Jan 25, 2022 12:07 am
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Replies: 16
Views: 690
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| Hi guys Can anyone who has experience designing for the 65816 know the realistic maximum number of devics (TTL/CMOS load) you can have being driven by the address bus and various control signals such as RWB? (data bus wise, it would be down to the buffer/PLD ... |
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Forum: Programming Topic: Tool Chain for 65816 |
| Martin_H |
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Posted: Thu Jan 06, 2022 2:33 am
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Replies: 15
Views: 1483
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| ... Ophis assembler and run unit tests in the Py65Mon. That allows for a fast development cycle before I go to real hardware. Now that I have working 65816 hardware, I'd like a similar development environment. Can anyone recommend a 65816 assembler for Windows? Can anyone recommend a 65816 emulator ... |
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Forum: Hardware Topic: Detecting 65816 interrupts pre-stack alteration |
| AndrewP |
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Posted: Thu Dec 30, 2021 8:41 pm
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Replies: 4
Views: 452
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| Following on from this post I've tried detecting interrupts BEFORE any of the stack pushes occur; and using Dr Jefyll's schematic below wavery00.png I've simulated up the following for detecting software interrupts: SoftwareInterrupt.png and hardware interrupts: HardwareInterrupt.png And both cases... |
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Forum: Forth Topic: Are there any links to a 65816 version of FigForth? |
| IamRob |
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Posted: Sat Dec 25, 2021 2:44 am
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Replies: 6
Views: 495
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I am ready to move on to the 65816 version of FigForth.
Is there an link anywhere or is this a DIY project?
The versions I have come across for the 65816 are for a full 32-bit Forth or just have the original 6502 instructions. |
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Forum: Hardware Topic: JRC-1, my latest 65816 build |
| jmthompson |
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Posted: Fri Dec 24, 2021 2:36 am
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Replies: 9
Views: 469
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| I'm super happy to report that my latest design, the JRC-1, is up and running! jrc1.jpg (apologies for the slightly blurry picture) The board is 200x130 mm and four layers. It was manufactured by JLCPCB. The system specs are: 65c816 CPU @ 4 MHz 1 MB of 55 ns SRAM (2 x AS6C4008) 256 KB of 90 ns EEPRO... |
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Forum: Hardware Topic: What markings on your 65816 DIP chips? |
| BigEd |
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Posted: Thu Dec 16, 2021 6:13 pm
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Replies: 5
Views: 433
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| Just a thought, we could collect the markings on any 65816 chips we have. We might find for example that quite a few years of recent purchases are all from the same batch. Or that they are all very different. Mine were bought, I think, in April 2008, ... |
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Forum: Hardware Topic: Timing for a multi-processor shared memory 65816 system |
| AndrewP |
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Posted: Wed Dec 15, 2021 6:55 am
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Replies: 32
Views: 1526
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| Hi all, A question I've been asking myself is can multiple W65C816s all be connected to the same 'main' memory and run both concurrently and completely transparently to each other? It's a topic that's come up in this Logisim thread where I've been cheerfully confusing Dr Jefyll with my vague explana... |
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Forum: Hardware Topic: 65816 Banks Half Filled With RAM For Symmetric Decode |
| Sheep64 |
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Posted: Thu Nov 11, 2021 5:31 pm
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Replies: 4
Views: 746
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| I have seen many comments which suggest 65816 bank zero must be treated as a special case. I question this wisdom. What is the downside of mirroring I/O and ROM in all banks? For example, having 32KB RAM, 16KB I/O and 16KB ROM in every bank where ... |
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Forum: Newbies Topic: byte length of 65816 instructions |
| jeffythedragonslayer |
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Posted: Wed Nov 03, 2021 9:44 am
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Replies: 7
Views: 855
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| Is the byte length of 65816 instructions a function of only the addressing mode used and not which register is being accessed or the opcode, just like the 6502? |
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Forum: Hardware Topic: How does ABORT on the 65816 actually work? |
| AndrewP |
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Posted: Tue Oct 19, 2021 5:28 pm
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Replies: 7
Views: 907
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| I'm seriously confused here so diving right in... Programming the 65816 says: The ABORT’ input pin, when it is asserted, causes the current instruction to be aborted. Unlike an interrupt, none of the registers are updated and the instruction quits execution ... |
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Forum: Emulation and Simulation Topic: 65816 Logisim Project |
| AndrewP |
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Posted: Wed Oct 13, 2021 6:56 pm
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Replies: 55
Views: 41551
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| Hi all! First post here and it's because I need a bit of help. Is anyone familiar with writing Logisim libraries? I've written a (half) cycle accurate 65c816 emulator that I had intended to drop into Logisim but I do not understand how Logisim's port propagation works. If you take a look at the imag... |
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Forum: Hardware Topic: 65816 /ABORT Pin As General Purpose Interrupt |
| Sheep64 |
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Posted: Mon Oct 11, 2021 9:40 am
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Replies: 1
Views: 317
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| BigEd notes that 65816 /ABORT pin functionality may be completely unexplored within a practical system . BigDumbDinosaur notes that use of /ABORT for memory protection may cause an infinite loop if stack memory faults . BigDumbDinsaur ... |
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Forum: General Discussions Topic: Survey of '816 systems... (65816 / 65C816) |
| drogon |
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Posted: Fri Oct 01, 2021 10:26 am
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Replies: 22
Views: 2358
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| In another thread I mooted a separate thread to maybe find out just how many 65816 systems there are, so I'll start with what I know: Older, commercial systems: ⋅ Acorn Communicator - 1985 ⋅ Apple IIgs - 1986 ⋅ Super Nintendo entertainment ... |
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