| Author |
Message |
Forum: Hardware Topic: Acolyte '816 SBC |
| sburrow |
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Posted: Thu Jan 18, 2024 11:00 pm
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Replies: 25
Views: 4445
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| Hello everyone! The time has finally come for me to show to you my latest single board computer: The Acolyte '816 Computer This is a 4" x 4" four-layer board with a mix of surface mount and through-hole components. I used solder paste and a skillet for the QFP packages ... |
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Forum: Programming Topic: '816 Assembler, & 512 byte Bootloader + Mini-Monitor! |
| sburrow |
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Posted: Sun Dec 03, 2023 3:05 am
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Replies: 11
Views: 1692
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| Well, I won't say it's the best thing ever but here's something new (for me): First is the Assembler.cpp. What is it? It's an assembler for the '816, but with my own flavor added I guess. I am not following a lot of standard conventions here, but it works pretty well and has some cool features ... |
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Forum: Hardware Topic: Attempt at '816 |
| and3rson |
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Posted: Wed Aug 30, 2023 6:40 pm
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Replies: 39
Views: 10108
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| ... myths", an SBC by mike42, and some threads on this forum, and I think I have a general understanding of how to do the address decoding with '816. Still, I'd like to get some inputs in case I'm doing something wrong, plus some questions. My address demux looks like this: v01_address_latch.png ... |
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Forum: General Discussions Topic: SA-1 - Nintendo's dual-CPU architecture, 4x clocked '816 |
| BigEd |
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Posted: Fri May 19, 2023 9:55 am
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Replies: 6
Views: 2860
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| ... into a system, with shared memory or otherwise. Today I learned that Nintendo made such a system, whereby some 33 game cartridges have their own '816-based chip, but clocked 4x the speed of the main one in the console. Both CPUs can send IRQs to the other. The fast one powers up into an idle ... |
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Forum: Hardware Topic: 816 bodge board V1. Gotta go fast |
| AndrewP |
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Posted: Sun Dec 04, 2022 7:37 pm
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Replies: 16
Views: 1122
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| ... What I have wanted to know is how fast can the W65C816 be stably run. If I take all the address decoding out of the equation and just attach a '816 to an SRAM how fast will it go? 816BodgeBoardOperation.png Basically this ^ To load a program into memory I use a pair of Raspberry Pi Picos whilst ... |
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Forum: SBC- Series Projects Topic: 816 bodge board V1. |
| AndrewP |
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Posted: Sun Dec 04, 2022 7:13 pm
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Replies: 0
Views: 20074
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Whoops, posted to the wrong sub-forum. Garth, if you run into this please could you delete it.
Thanks!
Andrew |
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Forum: General Discussions Topic: History Q: speed ratings of '02 and '816 chips sold |
| BigEd |
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Posted: Wed Mar 09, 2022 3:14 pm
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Replies: 20
Views: 1216
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| ... here of the rated, specified, speeds of 40 pin DIPs (and similar sized surface mount offerings) available in the open market. Today we buy '02 and '816 chips rated at 14MHz. In the early days we had '02 chips rated at 1MHz, later at 2MHz, then at 3MHz and 4MHz. I'm not sure what the original speed ... |
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Forum: Hardware Topic: Why has no one designed an address bus expander for the 816? |
| tokafondo |
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Posted: Sat Nov 20, 2021 9:10 pm
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Replies: 54
Views: 2460
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There are many projects out there of people building way more complex devices than a simple bus expander for the 65816. And I say simple because the schematics are out there and widely known.
So why is it that no one has build this?
Thanks. |
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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: 2340
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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 System (SNES) 1990 Modern ones... |
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Forum: Hardware Topic: Anyone using Rdy to halt a 65C02 ? (or '816) |
| drogon |
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Posted: Sat Aug 21, 2021 8:39 am
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Replies: 25
Views: 1208
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| I'm wondering if anyone is successfully using Rdy to halt a 65C02? I tried it some time back on my Ruby boards and had mixed results - in that it worked very well - I was pulling Rdy low, then BE low, then fiddling with the RAM from another processor (an ATmega), then releasing BE then taking Rdy hi... |
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Forum: General Discussions Topic: Multi-tasking OS in the '816 ... |
| drogon |
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Posted: Mon Aug 16, 2021 1:21 pm
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Replies: 7
Views: 1455
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| I've been somewhat diverted from my Ruby816 project by things like moving house and doing some stuff for the Cerberus 2080 project (more on that here, soon!) but I thought I'd put up a sneak peek at my Ruby816 multi-tasking OS in operation. The demo calculates Pi to 100 places in just over 6 seconds... |
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Forum: Programming Topic: WDC Tools STARTUP.ASM and C samples files for 6502/816 |
| tokafondo |
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Posted: Wed Apr 21, 2021 9:51 pm
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Replies: 22
Views: 2457
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| Directly from WDC themselves, after a exchange of emails with them I've been allowed to share these with you: Note the csamp.zip was meant to run on an old dev board (no longer in production or supported as it worked through the parallel port) or the simulator. startups.zip csamp.zip (*) I hope this... |
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Forum: Programming Topic: Other OS for the '816 ... |
| drogon |
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Posted: Wed Mar 24, 2021 10:10 am
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Replies: 12
Views: 1332
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| ... MOS as used in the (6502 based) BBC Micros in the early 1980's, and supports IRQ chaining for your own hardware, a 100Hz ticker (1000Hz in the '816 version) which with a little effort can be used to schedule interrupt driven "ISR" type code snippets in the same way you do it on the ... |
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Forum: Hardware Topic: I/O in an '816 system using no extra chips |
| BigEd |
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Posted: Fri Sep 18, 2020 10:41 am
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Replies: 4
Views: 721
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| I just had a great/terrible idea for an I/O channel needing no chips. Use NMI as the input, and A23 downwards as outputs. If it can bit-bang SPI, it's a winner. I'm not quite sure if it can be done. It probably means swapping out the usual latch which catches the address high bits, and swapping in a... |
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Forum: Hardware Topic: Sketches please: a fewest-chips logic-only 816 system |
| BigEd |
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Posted: Thu Sep 17, 2020 4:18 pm
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Replies: 52
Views: 4095
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| Prompted by a nearby thread , I wondered if there's a possibility of a six-chip 65816 design, or anything close to it. No programmable logic, of course, to make it a meaningful challenge, and it must have at least 128k of RAM and make use of the 816's extra address bits. I won't say more, as I would... |
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