Search found 11 matches

by benitoss
Mon May 04, 2020 12:25 am
Forum: MiSTer
Topic: ZX Spectrum Next sources released
Replies: 51
Views: 7205

Re: ZX Spectrum Next sources released

There is already a project underway to port the ZX Spectrum Next to MiST / MiSTer https://www.facebook.com/fmosqueraferrandiz/videos/10222956747530143/ The tricky bits being SRAM -> SDRAM conversion and Machine ID's for software compatibility. didn't you see this link was posted already some time a...
by benitoss
Sun May 03, 2020 5:01 pm
Forum: MiSTer
Topic: ZX Spectrum Next sources released
Replies: 51
Views: 7205

Re: ZX Spectrum Next sources released

Yes, you helped me a lot. The NEXt core uses a lot of BRAM to the video part, in fact uses the complete BRAM of the FPGA, I know because those are the parts with primitive instances that I had to change to make compatible the core to Altera. I think that the SRAM memory is only for the CPU. I will s...
by benitoss
Sun May 03, 2020 3:53 pm
Forum: MiSTer
Topic: ZX Spectrum Next sources released
Replies: 51
Views: 7205

Re: ZX Spectrum Next sources released

It's not easy to answer such questions without getting involved into project. 140MHz is definitely redundant. Also, i think the used SRAM in NEXT cannot work at 140MHz. 148MHz is probably used as pixel clock for HDMI output with upscale. I never used NEXT, but i'm sure original video has pretty muc...
by benitoss
Sun May 03, 2020 7:49 am
Forum: MiSTer
Topic: ZX Spectrum Next sources released
Replies: 51
Views: 7205

Re: ZX Spectrum Next sources released

porting to SDRAM is probably trickiest part of port. It will require some deep code modification. Probably some wait states on higher speeds with prefetch will solve the porting issue. Please, could you help me ??? I can clarify the code and you only will see the memory part directly The core uses ...
by benitoss
Sun May 03, 2020 2:59 am
Forum: MiSTer
Topic: ZX Spectrum Next sources released
Replies: 51
Views: 7205

Re: ZX Spectrum Next sources released

Just out of interest. Would it be possible to port the Spectrum Next core to the MiSTer? https://gitlab.com/SpectrumNext/ZX_Spectrum_Next_FPGA EDIT: Already found the answer, Phoebus Dokos says in theory it would be possible. Yes , I have ported the core to Altera Cyclone V FPGA Board Look at here:...
by benitoss
Mon Feb 24, 2020 9:11 pm
Forum: MiSTer
Topic: How to use the menu with SNAC controllers and other USER_IO controller solutions
Replies: 6
Views: 1115

Re: How to use the menu with SNAC controllers and other USER_IO controller solutions

The purpose of SNAC is to provide a native controller port to the core with nothing intermediate. ie just wires, for maximum compatibility with unusual peripherals. What you want would require interpreting every protocol as well. SNAC's primary function is for things that cannot be represented by U...
by benitoss
Mon Feb 24, 2020 8:31 pm
Forum: MiSTer
Topic: How to use the menu with SNAC controllers and other USER_IO controller solutions
Replies: 6
Views: 1115

Re: How to use the menu with SNAC controllers and other USER_IO controller solutions

Maybe the title is better in this way

"Reservation of one SPI ID to transfer data form USER_IO to handle the menu"

I only ask for the reservation of code 0X37 or any other for that !!!!
by benitoss
Mon Feb 24, 2020 6:28 pm
Forum: MiSTer
Topic: How to use the menu with SNAC controllers and other USER_IO controller solutions
Replies: 6
Views: 1115

Re: How to use the menu with SNAC controllers and other USER_IO controller solutions

I don’t see how one can make the assumption that SNAC controllers would have any uniformity whatsoever. Across systems, the IO signals are not used the same way; the signalling protocols have very little overlap, and even on the same system, for different controllers (i.e. mouse, joypad), the appro...
by benitoss
Mon Feb 24, 2020 3:31 pm
Forum: MiSTer
Topic: How to use the menu with SNAC controllers and other USER_IO controller solutions
Replies: 6
Views: 1115

How to use the menu with SNAC controllers and other USER_IO controller solutions

One of the disadvantages using SNAC and other USB3.0 I/O native controller connections is the lack of control of the menu options in the same way that the USB Controllers can do it. With a simple modification in 2 files in Mister firmware, and adding a one new SPI code in the Framework , we can get ...
by benitoss
Sun Dec 15, 2019 11:05 pm
Forum: MiSTer
Topic: DB9 Vs USB game control tests
Replies: 42
Views: 8279

Re: DB9 Vs USB game control tests

AFAIK, the snac board is exactly that, a level shifter (5v to 3v). I think antonio include directly an equivalent to the snac board and put a db9 connector instead of a usb one (some board has also hdmi connector to use blissbox cable). Personally, i think i will buy a snac board at some point, to ...
by benitoss
Sun Dec 15, 2019 5:12 pm
Forum: MiSTer
Topic: DB9 Vs USB game control tests
Replies: 42
Views: 8279

Re: DB9 Vs USB game control tests

How is this DB9 solution different than SNAC? That is already part of the main cores. The DB9 solution is simple, not electronic components are necessary unless the minimal (5 v to 3.3 v converter) to protect the FPGA In general in technical devices when a solution that works perfectly is simple, i...

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