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by Sorgelig
Tue Dec 12, 2017 3:07 am
Forum: MiSTer
Topic: Amiga on MiSTer
Replies: 1
Views: 85

Re: Amiga on MiSTer

I fully agree Minimig needs more love. My usage of Amiga is limited by games and demos. May be some fun with good old AMOS i've used ~25 years ago. I would love to see RTG but no one wants to share the code and i cannot make it alone from the ground. Serial port is not implemented on Minimig for MiS...
by Sorgelig
Mon Dec 11, 2017 2:23 am
Forum: MiSTer
Topic: Joystick testing thread
Replies: 35
Views: 1271

Re: Joystick testing thread

JimDrew wrote:I will try deleting the config and see if that works. If it doesn't, then you can PM me your address and I can send you a set of these INEXT controllers.

let me know if deleting config helped or not, and i will give you my address if not.
by Sorgelig
Sun Dec 10, 2017 2:37 pm
Forum: MiSTer
Topic: SDRAM board
Replies: 49
Views: 2323

Re: SDRAM board

ijor wrote:It might be possible to use the CKE pin.

Although not every SDRAM module bind it to VCC directly, it should be no problem to assume it as SDRAM enable pin.
by Sorgelig
Sun Dec 10, 2017 10:21 am
Forum: MiSTer
Topic: SDRAM board
Replies: 49
Views: 2323

Re: SDRAM board

You can use one pin on arduino header next to used 3 pins. This should be enough to switch between SRAM and SDRAM. Z state (1 with pull-up) should choose SDRAM to be compatible with existing cores.
by Sorgelig
Sun Dec 10, 2017 10:15 am
Forum: MiSTer
Topic: Joystick testing thread
Replies: 35
Views: 1271

Re: Joystick testing thread

Try to delete config folder from SD card - it will delete all settings. May be you've defined this joystick incorrectly in Menu core and it start to affect the other cores. Basically there are several way to fix it: 1) fix by yourself. 2) wait someone with the same pad and the same problem and abili...
by Sorgelig
Sun Dec 10, 2017 1:12 am
Forum: MiSTer
Topic: SDRAM board
Replies: 49
Views: 2323

Re: SDRAM board

if it will be a separate board, then it will require to swap the memory board depending on the core. Although it's expected, but will be much useful if both SRAM and SDRAM will be on the same board.
by Sorgelig
Sun Dec 10, 2017 1:04 am
Forum: MiSTer
Topic: MISTer on DE0-nano?
Replies: 49
Views: 1670

Re: MISTer on DE0-nano?

Edit: just looking at my footprint of the SDRAM IC - the pads are too long, I think that might contribute to some of the errors. Sorgelig's design has the pad much shorter. Next iteration I'll redo the footprint and halve the pads size for SDRAM. May be DE0 with your SDRAM board require other timin...
by Sorgelig
Sun Dec 10, 2017 12:58 am
Forum: MiSTer
Topic: Joystick testing thread
Replies: 35
Views: 1271

Re: Joystick testing thread

Do you use powered or un-powered HUBs?
In case of un-powered HUBs or direct plug to DE10-nano it;'s possible that iNext pad consumes too much power and thus work erratically.
by Sorgelig
Sun Dec 10, 2017 12:45 am
Forum: MiSTer
Topic: SDRAM board
Replies: 49
Views: 2323

Re: SDRAM board

Most retro systems bound to exact pixel clock and RAM cycles. But ZX core can run at 56MHz, SAM Coupe can run at 4x speed, and so on.
by Sorgelig
Sat Dec 09, 2017 7:51 am
Forum: MiSTer
Topic: SDRAM board
Replies: 49
Views: 2323

Re: SDRAM board

What SRAM is 10ns? let me search for you: https://www.mouser.tw/Semiconductors/Integrated-Circuits-ICs/Memory-Storage/SRAM/_/N-98xofZ1yzvvqx?P=1z0w7wb Why do you actually need SRAM vs. SDRAM? I didn't think i would need to explain the advantages of SRAM vs SDRAM.. Ok. 10ns means random access at 10...
by Sorgelig
Sat Dec 09, 2017 2:15 am
Forum: MiSTer
Topic: SDRAM board
Replies: 49
Views: 2323

Re: SDRAM board

JimDrew wrote:SRAM is fairly expensive

Didn't you tell the price doesn't matter? ;) 256MB of SDRAM isn't cheap as well.

JimDrew wrote:but they are kind of slow (45ns typical speeds)

I wasn't talking about "snail" SRAM. I was talking about 10ns SRAM.
by Sorgelig
Fri Dec 08, 2017 1:04 pm
Forum: MiSTer
Topic: custom USB controller adapters
Replies: 20
Views: 568

Re: custom USB controller adapters

Newsdee wrote:I wonder if the MCU could handle four connectors sharing the ground, VCC, and CLK.

You always can make several adapters.
Each joystick requires its own virtual device on USB. This may require a complex device description. With $4 per board it's not a problem to make several.
by Sorgelig
Fri Dec 08, 2017 12:38 am
Forum: MiSTer
Topic: custom USB controller adapters
Replies: 20
Views: 568

Re: custom USB controller adapters

so it's just matter of testing the code and modifying it for your needs.
by Sorgelig
Fri Dec 08, 2017 12:35 am
Forum: MiSTer
Topic: Arcade cores
Replies: 119
Views: 4954

Re: Arcade cores

From a developer's perspective, there's the question of why write for this platform instead of a more common one like the NES. Granted it might be harder, but install base won't be a problem. Gameduino outperforms NES as well. Which console at that period could display 256 sprites at the same time?...
by Sorgelig
Fri Dec 08, 2017 12:30 am
Forum: MiSTer
Topic: Minimig and Hybrid emulation.
Replies: 22
Views: 916

Re: Minimig and Hybrid emulation.

Had another thought on this. If the processor was emulated on the ARM would the RAM also need to be on the ARM side to achieve the expected speed? As I've wrote it in the first post: CPU+FastRAM should be on ARM side. Since FastRAM is accessible only by CPU, there is no reason to split them to diff...
by Sorgelig
Fri Dec 08, 2017 12:19 am
Forum: MiSTer
Topic: SDRAM board
Replies: 49
Views: 2323

Re: SDRAM board

More important would be find the way to add SRAM ~2MB along with SDRAM. That would be much more useful than adding more SDRAM. Using both chips at the same time is not required, so chips can share the same GPIOs and switched by some signal. 2MB of SRAM would be helpful for Minimig as well with Hybri...
by Sorgelig
Fri Dec 08, 2017 12:10 am
Forum: MiSTer
Topic: SDRAM board
Replies: 49
Views: 2323

Re: SDRAM board

Hardware design is what I have done for decades. I have created more than 300 commercial products (millions of circuit boards), spanning many different industries and I have a long history (1979 to present) in the Commodore/Amiga industry. By "succeess" i mean fully support from cores. If...
by Sorgelig
Thu Dec 07, 2017 2:11 pm
Forum: MiSTer
Topic: Arcade cores
Replies: 119
Views: 4954

Re: Arcade cores

However, they say that everything is opensource but I can't find the source of the coprocessor. it's there: j0.v And about the softCPU, I suppose that there is no opensource implementation of the AVR processor. there is one AVR softCPU on opencores. But i don't want to use AVR. It's too limited. ZP...
by Sorgelig
Thu Dec 07, 2017 1:22 pm
Forum: MiSTer
Topic: custom USB controller adapters
Replies: 20
Views: 568

Re: custom USB controller adapters

https://www.aliexpress.com/item/Pro-Micro-ATmega32U4-5V-16MHz-Replace-ATmega328-For-Arduino-Pro-Mini-With-2-Row-Pin-Header/32808519179.html This is just for reference. I didn't buy from this seller. Key feature is ATmega32U4 chip. You don't need any other components for you converter. Just wire any ...
by Sorgelig
Thu Dec 07, 2017 4:50 am
Forum: MiSTer
Topic: custom USB controller adapters
Replies: 20
Views: 568

Re: custom USB controller adapters

Forgot one thing: Choose Arduino Micro 5V version since you will need to communicate with 5V logic in some retro pads.
by Sorgelig
Thu Dec 07, 2017 4:44 am
Forum: MiSTer
Topic: custom USB controller adapters
Replies: 20
Views: 568

Re: custom USB controller adapters

It's too expensive. At ~$120 it costs the same as two Retro Freak adapters; that also does what I want :) Or I could get individual adapters at $20 each too. But thanks for pointing it out, It's a good product. I suppose I could breadboard a discrete adapter to start and go from there. if DIY versi...
by Sorgelig
Thu Dec 07, 2017 3:22 am
Forum: MiSTer
Topic: custom USB controller adapters
Replies: 20
Views: 568

Re: custom USB controller adapters

Newsdee wrote:The goal would be to make a lag free adapter which could support as many legacy formats as possible

then bliss-box posted above should be exactly what you want.
by Sorgelig
Thu Dec 07, 2017 12:18 am
Forum: MiSTer
Topic: custom USB controller adapters
Replies: 20
Views: 568

Re: custom USB controller adapters

Why don' use USB controller instead?
You can buy USB pads for around $9 only. So why bother to create a converter?

It's very important to describe your target in details to understand what advantages over existing solutions you will get and will it worth or not.
by Sorgelig
Thu Dec 07, 2017 12:06 am
Forum: MiSTer
Topic: SDRAM board
Replies: 49
Views: 2323

Re: SDRAM board

By the way, if you want guaranteed support, then you can re-design the I/O board without adding or removing anything. Just re-layout it to form which you can assemble by your tools.
by Sorgelig
Wed Dec 06, 2017 11:52 pm
Forum: MiSTer
Topic: Arcade cores
Replies: 119
Views: 4954

Re: Arcade cores

Newsdee wrote:I've found something similar: http://belogic.com/uzebox/howitsmade.htm
I guess there is no FPGA version of that AtMega MCU, though...

Gameduino outperform this by miles.

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