MiSTer FPGA Forum

Newsdee wrote: ↑Wed Jul 20, 2022 1:51 am

suww37 wrote: ↑Wed Jul 20, 2022 1:46 am Is it possible to output CGA 15Khz?

The core is outputing 15Khz already but at the wrong resolution. It's related to the issue I talk about in my last post.
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20220719_203613.jpg

I'm glad that 15Khz is possible. The problem is resolution. I wish the developer could change the resolution to 320X200 or 640X200. Is this possible?

Is it possible to output CGA 15Khz? I think that CGA graphics card resolution is supported up to 302X200, 640X200, so it is possible to output enough on a general crt monitor or TV. APPLE II core can output 15khz. I wonder if it is possible to make the PCXT core capable of outputting 15Khz.

Some potentially good news. Jotego is working on the Gunbird 2 arcade core. Gunbird 2 is a Psikyo SH2 system. This included the Yamaha OPL4 chipset for FM sound. The Yamaha OPL4 is backwards compatible with OPL3, OPL2, and OPL chips. So Soundblaster Pro, Adlib, and Soundblaster 16 drivers should theoretically work with the OPL4. http://www.system1...

I wonder if the Lion king will run fine on the ao486 without dropping frames. As I recall, lion king was difficult to play because of frame drops. Did a new bios update solve this?

Some potentially good news. Jotego is working on the Gunbird 2 arcade core. Gunbird 2 is a Psikyo SH2 system. This included the Yamaha OPL4 chipset for FM sound. The Yamaha OPL4 is backwards compatible with OPL3, OPL2, and OPL chips. So Soundblaster Pro, Adlib, and Soundblaster 16 drivers should theoretically work with the OPL4. http://www.system1...

The monochrome (amber/green) screens I remember didn't do gradients very well. That was more the area of what was called VGA Paperwhite monitors in the early 90's but those weren't green or amber. Gradients appear when selecting a vga or ega graphics card. If you choose a cga graphics card, you will get a screen similar to the monchrome monitor yo...

Newsdee wrote: ↑Mon Jul 18, 2022 3:08 pm

suww37 wrote: ↑Mon Jul 18, 2022 3:05 pm How do I use unix binary in MiSTer?

Press F9 on main MiSTer menu (core selection) to go into linux. User/Pwd is root:1
(for other shortcuts - see here viewtopic.php?p=10294#p10294 )

"./serdrive -n 80MB 80.img"
How do I run this command?

Newsdee wrote: ↑Mon Jul 18, 2022 3:08 pm

suww37 wrote: ↑Mon Jul 18, 2022 3:05 pm How do I use unix binary in MiSTer?

Press F9 on main MiSTer menu (core selection) to go into linux. User/Pwd is root:1
(for other shortcuts - see here viewtopic.php?p=10294#p10294 )

I don't know how to use linux. I would appreciate it if you could tell me the script that can create hdd 80MB.

Newsdee wrote: ↑Mon Jul 18, 2022 2:28 pm

suww37 wrote: ↑Mon Jul 18, 2022 1:43 pm How do I use a serdrive? Are you running on pcxt core dos?
"Serdrive" is neither "serdrive.exe" nor "sedrive.com" file.

serdrive is the unix binary on MiSTer - the same command you use to mount the image on COM

How do I use unix binary in MiSTer?

You miss the fdisk step, I got stumped on this as well before. But I don't understand how you format the image. Because, fdisk is to format floppy drives and format is to format hdd. Then, you rename to .vhd and you mound on ao486 as a hdd (ao486 can't mount .vhd as a floppy), or what do you do? If I try to mount .img as a floppy, same issue, ao48...

Turbo mode is supported on the pcxt core and tandy mode is also supported. Now all that's left is the built-in pcxt IDE module, not the IDE com port script. I believe this will happen soon as well. Another thing I desperately want is Hercules graphic card mode, not the MDA. I haven't heard that the Hercules FPGA has been implemented yet. I'm not a...

Turbo mode is supported on the pcxt core and tandy mode is also supported. Now all that's left is the built-in pcxt IDE module, not the IDE com port script. I believe this will happen soon as well. Another thing I desperately want is Hercules graphic card mode, not the MDA. I haven't heard that the Hercules FPGA has been implemented yet. I'm not a ...

I wanted to report back that I finally worked through the serdrive disk "Bad Command Checksum" that I have been plagued with from the start of this project. I have been using 86Box/PCem/Windows to create the raw disk images (IMG/VHD). Once created to the size I wanted I would pull over to either AO486 or 86box, fdisk, and format the disk...

I wanted to report back that I finally worked through the serdrive disk "Bad Command Checksum" that I have been plagued with from the start of this project. I have been using 86Box/PCem/Windows to create the raw disk images (IMG/VHD). Once created to the size I wanted I would pull over to either AO486 or 86box, fdisk, and format the disk...

pcxt cor 14Mhz Test

prince of persia nice play
outrun. nice play
wings of fury nice play
death track. same slow
bubble bobble abnormal
north & south abnormal

Newsdee wrote: ↑Sun Jul 17, 2022 3:47 pm

suww37 wrote: ↑Sun Jul 17, 2022 3:38 pm Death track game, but I don't know why. I wonder if it's possible to adjust it with 10Mhz.

Death Track feels too slow for me at 14mhz but I guess the original was slower (from seeing a youtube video)

The north & south game breaks the graphics and takes a freezing while running.

14.318MHz (BIU_CLK_COUNTER_ZERO=1'b1) Test. I haven't had a chance to try it yet but it sounds great! @microcorelabs, would it be too complicated to add the instructions for an 186 ? We could also have with it the equivalent of a NEC v20 up to 14Mhz . I'm so happy. Thank you for kitune-san . Finally, I can see the normal movement of the prince of ...

I found a nice slowdown program that works with ao486: http://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/distributions/1.2/repos/pkg-html/slowdown.html It's pretty easy to use, for example to set it at 12Mhz for Death Track: SLOWDOWN.EXE /Mhz486:12 And for Megaman 25Mhz works best: SLOWDOWN.EXE /Mhz486:25 dtrack.png The speed down utility li...

I insist, it seems strange to me that it is a problem of the UART speed, but is it possible that you are using the experimental 7Mhz version? That might make more sense. In any case, if it's the UART speed, it's not necessary to change the core, in the script set it to 115.2K and it will work anyway, but at the previous speed. I solved it. It was ...

I insist, it seems strange to me that it is a problem of the UART speed, but is it possible that you are using the experimental 7Mhz version? That might make more sense. In any case, if it's the UART speed, it's not necessary to change the core, in the script set it to 115.2K and it will work anyway, but at the previous speed. I solved it. It was ...

Updated prebeta 1.4 and prebeta 1.4 7mhz branches: https://github.com/spark2k06/PCXT_MiSTer/commit/c3c5be065ad98b5f52e9b56681843a0e641f0db7 https://github.com/spark2k06/PCXT_MiSTer/commit/3c872357d4b5b348ebc740b11d288cc60fc7d9d8 CGA Mode Detection 320x200x4 The Tandy 320x200x16 mode is "high resolution", so identification and use of this...

Here is a first unofficial build release of a monochrome mode for ao486. Don't expect it to be merged ... but I've included the HDL changes in the zip file, if anybody wants to tinker with it. I sacrificed some OSD flags to have space for the Display Mode menu; there are now a few monochrome options, including the original four and some others add...

memories of having fun with the XT monochrome monitor and hercules I've tried making a monochrome mode for ao486. It's a long shot ... and I may not merge it (I'm by no means a core developer), but it's an interesting experiment. The rbf attached use the same algo as the PCXT core but extended to 8-bit color. It doesn't work well with EGA or VGA y...

Updated prebeta 1.4 and prebeta 1.4 7mhz branches: https://github.com/spark2k06/PCXT_MiSTer/commit/c3c5be065ad98b5f52e9b56681843a0e641f0db7 https://github.com/spark2k06/PCXT_MiSTer/commit/3c872357d4b5b348ebc740b11d288cc60fc7d9d8 CGA Mode Detection 320x200x4 The Tandy 320x200x16 mode is "high resolution", so identification and use of this...

I won't know until this weekend when I try it out myself what the current situation is on ao486 as far as 386 era games, are they not working? That's what I'm wondering too. From various answer in this (and the other thread), I get the impression that one issue is being able to know what settings to use to match some specific 286 and 386 speeds. I...

Does the double dragon work well? Tetris also wonders if the graphics are coming out normally. I use 6.22 and double dragon works well, I was told dos 6.22 does not use more ram that older version, it even uses less ram than others like version 5 for example. https://ctrl-alt-rees.com/2021-01-06-which-dos-version-uses-the-least-memory.html MS-DOS ...

Mills wrote: ↑Fri Jul 15, 2022 1:42 pm

suww37 wrote: ↑Fri Jul 15, 2022 12:37 pm

Newsdee wrote: ↑Fri Jul 15, 2022 12:15 pmI use DOS 6.22

Does the double dragon work well?

Tetris also wonders if the graphics are coming out normally.

I use 6.22 and double dragon works well, I was told dos 6.22 does not use more ram that older version, it even uses less ram than others like version 5 for example.

does the double dragon work dos 6.22 in PCXT_PREBETA_1_4_7Mhz?

Newsdee wrote: ↑Fri Jul 15, 2022 12:15 pmI use DOS 6.22

Does the double dragon work well?

Tetris also wonders if the graphics are coming out normally.

What version of DOS do you use with pcxt core? I've tried MS-DOS 3.31, MS-DOS 3.31 compaq, MS-DOS 5.0, freedos, and MS-DOS 6.21 in pcxt core. MS-DOS 3.31 has a maximum hdd recognizable capacity of 30MB. The conpaq version recognizes HDDs of more than that capacity so I am using this version. However, unlike the actual XT pc, PCXT core varies the op...

I saw the ao486 speed-related ticket you organized. However, the "Death track" moderate speed is 10 to 12 MHz, not 8.93Mhz. I don't think ao486 is a core with the right speed for XT and AT pcs. Not right now, but I wonder if we could get it to run at 10Mhz or 12Mhz AT-equivalent speeds with a bit of tweaking on ao486. Perhaps we can try ...