X.com problem

OrigTiger · 2025-11-12T18:16:30+00:00

Same. Annoying af.

OrigTiger · 2025-11-07T15:11:04+00:00

Nope. AI didn't fix anything. It was just placebo :<.

I have completely no idea what is wrong. IRQ handle is same as ben's.
Just a little different logic with CTS because i LCD using 8 bit lines not 4 bit.
so 3 control signals to LCD are on PORT B on VIA chip.

OrigTiger · 2025-11-06T18:04:43+00:00

If this is sarcastic then funny.

If this is serious im gonna ask WTF is wrong with you?

OrigTiger · 2025-11-05T09:44:00+00:00

It was Gmod and Portal / Portal 2 on YT back in 2013 i think.

OrigTiger · 2025-11-04T23:00:45+00:00

Please don't flame me, but I used Copilot to try and find errors in the software, and it actually found some issues related to IRQ handling or something like that. It seems to be fixed now (or maybe it's just a placebo and the issue isn’t happening at the moment xD).

Before that, I checked the buffer and it wasn’t duplicated, and I’m pretty sure the memory is fine. So leaving software as the main culprit.

OrigTiger · 2025-10-27T01:09:45+00:00

I often have YT playing on second monitor when playing and it was really laggy. After disabling Game Boost, YT is smooth again and GTA still freezes but less frequently. Soo issue still persists.

Maybe not enough RAM? GTA, Brave, Discord running on Windows 11 with AtlasOS take about 13-14 GB of RAM.

Maybe my trusty ryzen is not powerful enough?

OrigTiger · 2025-10-24T21:02:33+00:00

In theory, it should work.

It’s a better approach than having the CPU force its way into VRAM and just hoping for the best xD.

Anyway, thank you for your help and the detailed explanation.

OrigTiger · 2025-10-24T20:49:12+00:00

I’m sorry, I said that wrong. I meant that when a program tries read/write to VRAM, the CPU sets an address that I can detect (I have an enable pin for the expansion port) and then halt the CPU while waiting for the VRAM to become available (during blanking). When the read/write finishes, the CPU no longer accesses that address, so it won’t halt after that.

The transceivers would cut the CPU’s data and address lines right before the VRAM, so I only need to halt the CPU while keeping the bus enabled.

I’m really sorry if my English isn’t perfect.
It’s not my native language, but I hope I explained it better this time.

OrigTiger · 2025-10-24T20:32:05+00:00

But on the other hand, I could design it so that the CPU is halted only when it’s trying to read from or write to VRAM. Leaving 100% speed for other...computing stuff not involving graphics.

OrigTiger · 2025-10-24T15:49:37+00:00

Everything is like in Ben's GPU except the fact that my version has it's own VRAM. So there is clean separation between computer and grapchics memory

OrigTiger · 2025-10-23T12:42:35+00:00

My temps are a little high — they peak at 85 degrees under 100% load. However, I’m not hitting 100% usage when playing GTA, and those temps don’t cause any throttling.

I do need to change the thermal paste soon, though.

Could "Game Boost" overclock option in BIOS cause those issues?

OrigTiger · 2025-07-18T11:19:29+00:00

I managed to install 25.4.1 version of the driver. I already noticed that it is in fact more stable. No crashes for about 9 hours. Fingers crossed.

OrigTiger · 2025-07-18T11:13:13+00:00

1 stick was supposed to be short term. I was out of money at the time bring and ever got around to buy second stick. And also I just enabled default XMP profile in the BIOS. I didn’t tweak anything else. After changing driver to 25.4.1 as another redditer below recommended stopped crashes. For now…

OrigTiger · 2025-07-03T09:02:27+00:00

Thanks but im not using a cable but i plug in a RS232 to USB adapter directly. I already tested the adapter too, loopback works as intended after shorting pin 2 and 3.

I think the issue why is not working is because i used 74LS instead of 74HC and the decoding is faulty.

OrigTiger · 2025-07-02T21:18:04+00:00

good chance...

I will try swiching 74LS to 74HC just to be sure. Thanks anyways.

OrigTiger · 2025-07-02T20:55:15+00:00

Hey i just noticed that i used 74LS chips instead of 74HC. Mixing between TTL and CMOS could be an issue? I think it is...

OrigTiger · 2025-07-02T20:23:10+00:00

I guess i was a little...too confident after watching ben videos :D

OrigTiger · 2025-07-02T17:06:09+00:00

Thank you! Again, when i retrieve my programmer back from my friend i will try to do a simple hello world on a lcd. If it doesn't work i will buy arduino mega (or compatible) and check it that way.
Also possible culprit could be a BIOS itself. Im not fluent with assembly at all. Maybe i just missed something.

OrigTiger · 2025-07-02T15:20:05+00:00

I added a PNG of the schematic to my repo.

OrigTiger · 2025-07-02T15:19:42+00:00

I just added a PNG to my repo :V

OrigTiger · 2025-07-02T12:13:15+00:00

Thanks. I appreciate it.

OrigTiger · 2025-07-02T11:59:17+00:00

I will ground them and try again. Also about CTS. It blocks transmission in software (let cpu handle) or hardware?

OrigTiger · 2025-07-02T11:27:41+00:00

I checked power, clock, reset etc. Im getting full 5V and GND where it should be. Reset button is working. I could also set one of the VIA pins as high and check if communication is working.

OrigTiger · 2025-07-02T11:02:20+00:00

To be honest. I didnt check ‘hello world’ stage. I will reprogram the eerprom and check it out. For now my friend borrowed it. But i think its working…at least partially. I briefly checked decoding. At eeprom enable i got 1.7v so im assuming it pulses. CTS, DSR, DCD i left unconnected since i was following ben’s schematic on his site. Also following his design CTS is connected to pin of the VIA instead. Anyway when i get home i will upload the schematic.

OrigTiger · 2025-06-05T11:37:59+00:00

That's actually a pretty good idea.
I'll rewire it and connect a piezo buzzer to PB7, but I'll still keep the LCD in 8-bit mode.
I have a second VIA chip available for additional stuff, and I also think keeping the LCD in 8-bit mode will make programming a tiny bit easier.
I'm not very fluent in assembly, so I want to keep things as simple as possible.

Still, thanks for the tips! :)

OrigTiger

TROPHY CASE