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 Forum: Newbies   Topic: 65C816 Handheld Planning

 Post subject: 65C816 Handheld Planning
Posted: Mon Feb 12, 2024 4:12 am 

Replies: 20
Views: 669


... to learn along the way to get myself to learn new skills. Right now, I'm doing early research on building a 16-bit handheld game system using a 65C816 as its CPU and would like to help with being pointed in the right direction for my research and double checking what I think I know. I'm looking ...

 Forum: Programmable Logic   Topic: Assistance with 65C816 to FPGA UART Communication Issue

Posted: Thu Jan 11, 2024 2:05 am 

Replies: 40
Views: 1209


Hey, all. I'm currently working on an project that involves interfacing a 65C816 microprocessor with a Digilent CMOD A7-35T FPGA board (Artix 7). The goal is to leverage the FPGA's capabilities to expand the functionality and performance of the 65C816. I'm doing ...

 Forum: General Discussions   Topic: Where to buy 65C816's?

 Post subject: Where to buy 65C816's?
Posted: Wed Sep 20, 2023 12:20 pm 

Replies: 7
Views: 3755


Hello everyone! I was looking around the internet for a place to buy 65C816 chips. Preferably not DIP packaging, though I'd like to see whatever is available. Mouser currently has around 80 DIP, 30 PLCC, and 80 TFP. In comparison, they have thousands of 65C02's! ...

 Forum: Newbies   Topic: Help on choosing an MMU for 65c816

Posted: Mon Sep 18, 2023 2:41 pm 

Replies: 15
Views: 10039


Hello,

I would make a ''homebrew computer'' based on 65c816

What is a good MMU easily purchasable, which allows you to connect to the cpu :
1 rom 8MB
1 ram 256KB (another cpu (cpu 2) must be able to read in this ram)
1 ram 256KB (another cpu (cpu 3) must be able to read in this ram)


Thanks

 Forum: Hardware   Topic: Attempting a 65c816 build (with learning opportunities.)

Posted: Thu Jun 29, 2023 6:24 pm 

Replies: 20
Views: 675


Background: I'm creating an 65c816 SBC based on the POC-V1 design of BigDumbDinosaur. My board differs from BDD's in that I'm using a 15ns 28c256 EEPROM (rather than BDD's 27c256) and two 15ns 71256SA SRAMs (rather than BDD's single SMT ...

 Forum: Hardware   Topic: Timing for a multi-processor 65C816 system...

Posted: Sun Apr 16, 2023 8:24 pm 

Replies: 7
Views: 801


... access window where none of the '816s are accessing memory. Timing.png Think of the yellow signal as being a memory access window. The first 65C816 Board's memory address and data are kept of the main memory bus until time SEL3 where a read or write from main memory can be done. Similarly ...

 Forum: Programming   Topic: SWEET32, a SWEET16 inspired 32-bit VM for the 65c816

Posted: Sat Jan 14, 2023 7:41 pm 

Replies: 4
Views: 848


While i was pondering what new project to work on for my 65816 SBC i randomly remembered that SWEET16 is a thing and wondered if anyone ported it to the 65816 yet... around 2 seconds later by brain actually turned on and i realized that a 16-bit VM like SWEET16 makes very little sense on an already ...

 Forum: Hardware   Topic: 65C816 Prototype System

 Post subject: 65C816 Prototype System
Posted: Wed Dec 21, 2022 1:44 am 

Replies: 16
Views: 1243


I had an idea it might be fun to build something like a "souped-up BBC Micro" using a 65C816 processor instead of a 6502, running as fast as reasonably possible, and loads of RAM. As a stepping stone I built a prototype system to develop and test some building ...

 Forum: Hardware   Topic: Sound options for the 65c816

Posted: Fri Nov 25, 2022 4:03 am 

Replies: 11
Views: 1782


Hi all, I've been working on my homebrew 65c816 computer for a while now and I don't have a good solution for sound generation. I am "cheating" a little by using a propeller 2 for vga generation and thought maybe I could use that. Thoughts? ...

 Forum: Hardware   Topic: 65C816 breakout board

 Post subject: 65C816 breakout board
Posted: Sun Jul 31, 2022 9:18 pm 

Replies: 9
Views: 1084


Hi all, I've been refining my 65C816 circuitry for over a year in my YouTube series, and I'm at a point where I consider the design stable enough to make a PCB. This project aims to provide in a single board everything needed to kick off ...

 Forum: Hardware   Topic: 65C816 to 16-Bit External Bus

Posted: Sat May 21, 2022 7:06 pm 

Replies: 17
Views: 945


Does anyone have any idea how to put a 65C816 on a 16-bit external bus? I realize that it would still take two 8-bit writes, internally, to write-out 16 bits, so you're still at 1/2 the full clock speed (externally). But, does anyone know of ...

 Forum: Newbies   Topic: Dual 65C816/65C02 build

 Post subject: Dual 65C816/65C02 build
Posted: Thu Mar 31, 2022 7:01 am 

Replies: 6
Views: 997


... of the board on top of it, plenty of space for tall capacitors, etc. My goal is a dual-processor system where either processor can be a 65C02 or 65C816. If both are 65C02 they will have to split the stack in page one. If one is an 65C816 it gracefully moves its stack and zero page out of the ...

 Forum: Hardware   Topic: Dragon 65c816 SBC

 Post subject: Dragon 65c816 SBC
Posted: Wed Dec 29, 2021 11:39 pm 

Replies: 8
Views: 670


So, from the design thread in the newbie forum, I refined (mostly by removing things that would only increase complexity for a first-time board) the design. The Dragon v1.0 runs at a 4 MHz clock speed and has: ⋅ One 65C22 VIA to provide an SPI bus and GPIO ⋅ DS1305 real-time cloc...

 Forum: Hardware   Topic: 65C816 “STRANGE” OUTPUTS

Posted: Sun Dec 19, 2021 6:47 pm 

Replies: 9
Views: 1041


Along with its other features, the 65C816 added some “strange” outputs that, at first blush, seem to be solutions in search for problems. I'm referring, of course, to E and MX . E reflects the status of the hidden e bit in the status register ...

 Forum: Programming   Topic: 65c816 Machine Language Monitor

Posted: Mon Nov 15, 2021 5:36 pm 

Replies: 15
Views: 1671


I am trying to locate a machine language monitor for my VIC 20 with a 65c816 in it. My preference is to have it written in 6502 assembly, so it can run in emulation mode. I don't have any operating system for this except the Basic 2.0. I just need a simple ...
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