MiSTer FPGA Forum

No, because I am not sure they are supposed to work on a PCXT computer in the first place. It was Adventures of Robin Hood and Shadoworld. If you don't have a real PCXT , you can always use an emulator like PCem or 86Box , using the same configuration and HD image ;) I am not sure the exact same image can run in PCem? I already did make a setup. I...

I tested the new core, the newest official release. Had to update the MiSTer Main and the ROMs as well, but then it worked. It could not find the HDDs before I replaced the XTide bios. I got mouse and RAM working, ran Monkey Island with Tandy graphics, mouse and adlib audio. I tried some other games as well, that did not work before, but none of t...

I tested the new core, the newest official release. Had to update the MiSTer Main and the ROMs as well, but then it worked. It could not find the HDDs before I replaced the XTide bios. I got mouse and RAM working, ran Monkey Island with Tandy graphics, mouse and adlib audio. I tried some other games as well, that did not work before, but none of th...

Yeah, sure would be nice if something was done about it. Someone said they got Lion King running at normal speed in Windows 98, but so far I have not been able to get that to work. Windows 9x has so many random crashes. It is hard to know when it might be due to the core and its memory management or when its just how things were with those old oper...

AO486 seems to have some problems with real mode. Someone debugging those problems would also fix the issues it has with some DOS4GW games and probably more. This, DPMI specifically and something different between DOS4G (The og version that comes with most games) and DOS32a (which usually works around the problem and the game functions). It's a di...

I remember earlier in the AO486 development Warcraft 2 would not run in DOS but you could run it in Windows 95. But then, I suspect the fix for that was DOS32A, the DOS4GW replacement. But that does not seem to be enough for The Lion King.

Just tested running Lion King at 90mhz inside Win95 - initial stutters aside the game runs full speed. Crashes when running in dos mode. Interesting. Is this with or without lvl 2 CPU cache enabled? Maybe I should experiment with some different memory managers, this suggests it could be because Win95 has some memory protection. DPMI or something l...

Didn't someone started a hybrid for the Amiga, could something like that be done for AO486? eg: porting DOSBOX and offload graphics,sound or other parts to the FPGA? or something like that. Yeah, I have been hoping to see this happen. The Hybrid Amiga core never got very stable though, or rather I think the real problem was that it had problem wit...

From a 10,000-foot overview, it seems like the SD2IEC is doing the same thing that the Mister is already doing, just with a different interface. If someone implements it, it might be nice to have a toggle to either send the commands out the SNAC port, or else redirect them to the existing drive code. That way, you can either provide a real SD2IEC ...

The CPU is really weird in ao486 as some instructions execute way faster than a real 486 (of any type) and others execute significantly slower. On a real i486 I can get Lion King to run perfectly using slowdown programs but I can't get the same results on ao486. I gave up after I spent about 45 minutes with it with no results. There are people aro...

I think the TC68 Amiga core had CD audio support added to it, but it has not been ported to the MiSTer Amiga core yet.

Also, isnt VGA backwards compatible with EGA? I do not know much about Hercules In general yes; there's some edge cases that only EGA cards can do, e.g.: https://www.os2museum.com/wp/fantasyland-on-vga/ I'm not sure it makes sense to add VGA to the PCXT core though as it will need porting it to an 8-bit bus. Using it for a "PCAT" core (w...

What is a “proper 486 with correct timings”? I think the issue is that AO486 is not timing accurate to any 486 computer from the 90ies, because part of it relies on caches and such based on DDR3 RAM and other things based on the FPGA timings I think, and it just adds up to AO486 having some pretty strange timings compared to real hardware. The bot...

Nice, as long as we get more graphics modes :D I was just not sure if you were going to dive into those projects yourself and add features. I am guessing if you do not, or someone else interested in this core, we are unlikely to see it happen on the original source projects as they do not seem that active from what I have seen. If I went into the ...

Nice :) This core was initially using another open source project for the Tandy graphics right? So are you adding these new graphics modes on top of that? It is based on TubeTime's Graphics Gremlin : https://github.com/schlae/graphics-gremlin Initially I made some pull request to it, but it has reached some complexity to make new pull request with...

Nice This core was initially using another open source project for the Tandy graphics right? So are you adding these new graphics modes on top of that?

I hope the PCXT core will someday match the NuXT, but it using an actual 8088 (or V20) means that it's not even a clone, it's more or less the original thing. (sans mucking about with MFM and RLL disks, anyway. Those things sucked .) It has physical ISA ports and everything. What does it do if it uses an actual 8088 CPU? It is a new PCXT motherboa...

I think I saw that Alleycat has a special color theme for the PCjr. Not sure how many games have special PCjr support though. This article goes into it. There does seem to be... well... more than 10 games? That have PCjr specific enhancements without having Tandy support as an alternative: http://nerdlypleasures.blogspot.com/2022/04/list-of-pcjr-an...

If you get the SD2IEC to work for this core, would a similar solution not also work for the C64 core?

Oh if its done on the mister linux side alone (eg not in the fpga) then it should be a much simpler affair.. Yup... but I looked into it some more and currently all drives the C64 uses are FPGA logic based, so to make this work I would need to add a software driven drive and that ends up being too complicated for me I think. I do not have a deep e...

The Ultimate 1541 / Ultimate 64 devices already have a software IEC feature. It gives it minimal SD2IEC support. I think it limits it to one folder and its not enough for C64 OS. But I looked over its code and it is software IEC because its fully done on the software side. No FPGA logic used. So on the MiSTer it should be possible to do the same, a...

Oh I know what SD2IEC does and why C64OS needs it, im just trying to see if there are other programs/uses cases beyond just the one "c64os" to help build a case for why it should be added and what benefits it would bring beyond what we got now. That is what I just explained. There are several IDE64 games, versions of games that used to r...

Yea, I can see IDE64 emulation .. there are a few use cases for that one for sure.. if it could be implemented. It just makes a better proposition/argument if you can state a benefit for multiple reasons then one limited audience program.. Just trying to look for a justification that gives reason beyond what analog features are already there .. eg...

Would it be possible to add something like MiSTerFS in the current state of the core, or does that need interaction with the IDE hardware? That and sysctl would be really useful utilities to have . I think it might be able to work with how it currently is, but that it would make more sense to wait for the HDD to be IDE based. But that depends on h...

On its own SD2IEC does do things that help. GEOS has supported it for a while, making it possible to have one big GEOS disk instead of several. There are a whole bunch of games that got converted for IDE64, and they can also be run with SD2IEC. Multidisk games and such that with this works pretty much like a cartridge but it should also be able to ...

I found some source code for the Pi1541 and its iec commands implementation which might help develop SD2IEC for the MiSTer. Its not fully implemented though so it does not have all the SD2IEC commands: This file handles the Pi1541 modes: https://github.com/pi1541/Pi1541/blob/master/src/main.cpp And one of the modes is the SD2IEC mode and the comman...

Has anyone tried to implement SD2IEC support in the C64 or other Commodore cores? It works, but you need a SNAC2IEC adapter which you already have, I think. See here for Adapter Details: https://misterfpga.org/viewtopic.php?t=4469 The Adapter works also with the PI1541 and some other real CBM Hardware and MiSTer Cores (C128/C16). Some Videos: http...

I got JiffyDOS working for my MiSTer, but found it was too fast or incompatible with my SD2IEC, the problem probably bring its only running firmware version 0.10.3, but more problematic is that its bootloader does not support automatically updating the firmware. It can probably be updated if I update the bootloader or firmware directly on the ROM c...

Seems it is somewhat possible to load tapes from the C64 cores using the ACD port, which I guess is the audio in port you can get for the MiSTer?

https://www.youtube.com/watch?v=wvtQIBmj_DM

Notice his comment in the description though that he is not having much success with it, it fails more often than not.