MiSTer FPGA Forum

n0p

Can I ask where in sector 0 you store BIOS data? How does this work, and is this idea also present in actual hardware from the 1980's? Offset 190h, four bytes - id, two config bytes and checksum. It's checked to be clear (zeroes) or correct id/checksum before any operations, so if that area occupied, nothing will be written. As for original hardwa...

n0p

Here's my small contribution to this project: MiSTer PC XT BIOS It's a fork of well known 8088_bios (https://github.com/skiselev/8088_bios) MiSTer PC XT related enhancements: Memory size set to 704KB. So if A000h UMB enabled, 704KB memory will be available to system without any additional steps. Read-only RTC functions implemented in BIOS INT 1Ah, ...

n0p

While i was testing BIOS build, it appeared that config code broke floppy functionality. Fixed. Improved early XT-IDE detection - looks like it takes some time to init on cold boot. But that will give about 3 seconds delay if no XT-IDE master present. Added PWM floppy sound before OS boot. Can be disabled via setup. Tested cold boot on all CPU spee...

n0p

Just received much awaited addons and start looking at MisterXT :) Looks like it's suggested BIOSes goes with quite old XT-IDE release, so i made a build of main and XT-IDE BIOS. Main BIOS is a quick port of Book8088 (chinese XT laptop) BIOS i'm working on, which is a fork of Sergey's 8088_bios. XT-IDE updated to r625. Configured in full mode, so T...

n0p

Yes, 2 frame flickerblend is exactly what's needed (for a start :)) I wrote this code for Genesis Plus, but that's C. It will take some time to understand and study Verilog. void RenderLine_X1S2_Buffer (uint8 *src, int line, int offset, uint32 *table, int length) { PRE_X1_32_BUF; do { uint32 p1 = table[*src++]; uint32 p2 = *inCache; *inCache++ = p1...

n0p

I know that the Gameboy Advance and Lynx cores have it (I requested three frame blending for the latter one and Robert kindly added it). I would expect it to be possible, unless it is somehow tricky for CRT display oriented systems. Found the commit, feature is called flickerblend there https://github.com/MiSTer-devel/AtariLynx_MiSTer/commit/5222a...

n0p

40ms response time (from specs for Eizo L985EX) does that magic :) I couldn't find any reliable info on old phosphors, except it looks like correct name of the effect is "afterglow". So correct algo should be somewhat like: if new pixel is brighter, apply it immediately, if brightness is lower - apply some afterglow formula. I wish i reme...

n0p

Thanks guys!
Just connected to old EIZO LCD display via DVI-HDMI convertor and it looks much better than on new TV.
https://youtu.be/0oMJRhOtaTU

n0p

Armakuni wrote: ↑Sun Feb 11, 2024 11:10 am
The shadows blink on the Nuked-MD Megadrive core too which is based on the original chip decaps, So possibly is the same on original hardware too

True, but i might suggest that blinking shadows implementation expects some postglowing from CRT luminophore thus appearing as grayed area.

n0p

Will core have the use of USB hub and additional SD slot, or RTC? These are general MiSTer questions so you can best find the answers elsewhere on this forum. Please do research the information on hubs, and about the potential for back feeding with powered hubs. It may be best to stick to the kits and such that are out there which already include ...

n0p

(I'm using Genesis core only, as my addons for DE10-Nano are still on the way) To start, i'm quite impressed with the quality of the emulation. Everything works like it should. I never had a chance to play Samurai Shodown on real hardware, so i don't really know how it should look like. But every emulation has in-game shadows blinking. Long time ag...

n0p

Hi.
I'm new to this kind of emulation, but attracted to idea to have a possibility to modify pretty much everything if needed.
I've ordered a DE-10 Nano board already and would love to know which addons i need to run this core.
Looks like SDRAM is certainly needed, but which model?
Will core have the use of USB hub and additional SD slot, or RTC?

MiSTer FPGA Forum

Search found 12 matches

Re: MiSTer PC XT BIOS

MiSTer PC XT BIOS

Re: XT-IDE r625

XT-IDE r625

Re: Genesis Core Interpolation Between Frames?

Re: Genesis Core Interpolation Between Frames?

Re: Genesis Core Interpolation Between Frames?

Re: Genesis Core Interpolation Between Frames?

Re: Genesis Core Interpolation Between Frames?

Re: Addons needed to run XT core

Genesis Core Interpolation Between Frames?

Addons needed to run XT core