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 Forum: Programmable Logic   Topic: Latching 65816 bank byte in FPGA

Posted: Mon Mar 25, 2024 2:32 pm 

Replies: 8
Views: 165


Hi there, I am trying to speed up my Micro-PET design from 50MHz base / 12.5MHz CPU clock to 70 MHz base / 17.5MHz CPU clock. I have a stable read timing now, but the system does not correctly read and process the bank byte in time it seems. With bank clamped to zero, I see correct memory accesses (...

 Forum: Programming   Topic: RFC: Assembler syntax and ergonomics for the 65816

Posted: Wed Mar 06, 2024 11:31 pm 

Replies: 0
Views: 101


Dear 65xx community: We are in the early phases of implementing 65816 support as part of the https://www.llvm-mos.org project, and we need your opinons. For those who aren't familiar with what LLVM-MOS is - LLVM-MOS is a fork of the LLVM toolchain (which ...

 Forum: Hardware   Topic: Any downside to subbing 6502 with 65816?

Posted: Wed Feb 21, 2024 12:53 am 

Replies: 7
Views: 198


I’ll likely do a bunch of reworking of my breadboard setup soon. While I’m at it, wondered if there would be any downside with replacing the wd65c02 with wd65c816? Obviously a few pin changes but can I otherwise just pretend it’s still a 6502 until I want to experiment with some of the new features?...

 Forum: Programming   Topic: How do ML monitors support the 65816 modes?

Posted: Tue Dec 26, 2023 1:50 pm 

Replies: 7
Views: 388


I wrote an emulator for my MicroPET, using Sam Falvo's lib65816. I submitted a merge request for a few small changes even. What I am now looking for is how to support the 65816 in the emulator's built-in ML monitor. What I stumbled over was the support ...

 Forum: Emulation and Simulation   Topic: 65816 Emulator in C

 Post subject: 65816 Emulator in C
Posted: Sat Nov 18, 2023 6:43 pm 

Replies: 1
Views: 1000


... to try working on a small Operating System but do it all the work on my PC for easy of development. So i started looking for some customizable 65816 Simulators/Emulators and couldn't really find much. i did find "lib65816" but the github is very bare, not even mentioning or explaining ...

 Forum: Hardware   Topic: Doe the 65816 stop driving the databus when PHI2 falls?

Posted: Wed Jul 12, 2023 9:58 am 

Replies: 3
Views: 278


... the bank address.  Jeff's excellent topic is at http://forum.6502.org/viewtopic.php?f=4&t=2438 . And Jeff's linked topic "Managing the 65816 multiplexed bus". Once PHI2 is brought low does the '816 not drive the data bus for the next 10ns after? The datasheet would seem to say ...

 Forum: Programming   Topic: A 65816 Memory Map aka RES-> JML

Posted: Thu Jul 06, 2023 10:18 am 

Replies: 14
Views: 6055


Why's this under programming? I'm not sure if I understand JML on the 65816. I think even in emulation mode it can be used to change the program bank register; if not then my memory map below falls apart. I had a fairly normal 6502 style memory map going on. ...

 Forum: Hardware   Topic: 65816 Pseudo-SoC

 Post subject: 65816 Pseudo-SoC
Posted: Sat Jun 03, 2023 10:09 am 

Replies: 13
Views: 2535


... isn't a full computer inside a chip, it is an almost full computer on a chip sized/shaped carrier board. the system is planned to be powered by a 65816 with a VIA for some GPIO, and (gasp) no progammable logic! so i chose DIP-64, the same package the 68000 uses, as it hopefully has enough pins ...

 Forum: Hardware   Topic: 65816 Data/Bus Pins.

 Post subject: 65816 Data/Bus Pins.
Posted: Mon Mar 27, 2023 8:26 pm 

Replies: 24
Views: 1754


8 Pins, 26-33 on this pic I viewed here: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTUXDTM52KDdw6M_5VBHjQIDzVpjkNGsjYDQV65HVHKyJo9MvPFgoTvsCg07LkKcobDj0E&usqp=CAU are D/B 0-7, shared or 'multiplexed'? pins that are both data and address pins. this raises numerous ideas about the PC-MP...

 Forum: Hardware   Topic: 65816 Project "Integrity"

 Post subject: 65816 Project "Integrity"
Posted: Sun Mar 19, 2023 7:23 pm 

Replies: 54
Views: 6192


... System Integrity OS <working title> link: TBD an 8/16-bit mixed use OS for mcu/mpu computing and development runlevels for 8 bit 6502 work on 65816 in e-mode runlevel 0/1 is recovery/examination/boot mode higher runlevels for 'unlocked' hardware access or 16-bit mpu or modes (native mode) ...

 Forum: Programming   Topic: Newbie to the 65816. WDCtools C compiler and debugger issue.

Posted: Wed Feb 15, 2023 11:38 am 

Replies: 30
Views: 2306


... for input). It was build with a very specific purpose, and it has served me well. Now, I'm on the very early stages of the design of a full fledge 65816 computer. It's meant to have a standard set of inputs (keyboard, mouse, full VGA or higher screen), and a properly usable OS and tools. It's a ...

 Forum: Programming   Topic: Single stepping a 65816 with ABORTB

Posted: Fri Feb 10, 2023 6:03 pm 

Replies: 2
Views: 802


Barnacle's thread on Single stepping by inserting BRKs into RAM got me thinking. Rather than trying to insert the BRK opcode into the correct location following the current instruction why not insert the BRK op-code into databus when the op-code is being fetched*. It's solves the stepping into ROM p...

 Forum: General Discussions   Topic: int size for C compilers for the 65816

Posted: Sun Jan 29, 2023 10:21 am 

Replies: 17
Views: 1696


I am curious is there a C-compiler for the 65816 that may use 24-bit data? Some type for which sizeof(type)=3? Thank you.

 Forum: Hardware   Topic: noVa64 - Full 65816 Madness computer

Posted: Thu Dec 15, 2022 5:56 pm 

Replies: 9
Views: 836


... of weeks in my head, and right now, I'm into a wonderful feature creep madness phase. Right now, this is my list of requirements ⋅ 65816 CPU. ⋅ Vast amounts of memory (At least 16MB, more if possible through banking). DRAM is a must. ⋅ Laptop form factor. This ...

 Forum: General Discussions   Topic: the 65816 bug list

 Post subject: the 65816 bug list
Posted: Sun Oct 09, 2022 9:56 am 

Replies: 6
Views: 690


Is there a list of the 65816 bugs somewhere? I have found a text which lists several bugs but it is without details. :( The text contains the next information. It turned out that the core had several more apparent errors. Unfortunately, ...
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