DIY-A586 v1.9 by piotr_go

NO
Sorry, v1.9 will not have any significant hardware changes. The add-ons won`t fit in the FPGA and that`s it.
I`m already having a lot of trouble stuffing it, let alone adding something.
Sometimes it takes me all day to play with synthesis because it doesn`t fit or the timing doesn`t meet.
Core with AGA under v1.9 will not be available.

v2.0 with FPGA in TQFP, you can`t count on any changes either. Negative number of free pins.
AGA will fit here.

>>20974703

I wanted to say finalize this basket while LCSC has Spartans, but I see that they have released a new shipment and the price is even lower than it was.

So I`ll just say - be careful which oscillator you choose, because personally, the first time I made a mistake and bought a quartz one. I know someone else in the thread made a similar mistake. C7434931 definitely works.

as for the remaining parts, the W9825G6KH-6 works, although some have reported problems with the RISC-V core, but the Amiga is stable.
finding 74HCT2G125 in VSSOP-8 is difficult - I managed to find it on aliexpress. I just don`t know what I really got because this system is used for communication with an external keyboard, in fact it`s probably only for LEDs. Piotr can explain some details related to keyboard support in the current version.

regarding improvements to the project:
1. @Hetii, you can devote your time and skills to the design of a 3D printing case - it would be nice if you could insert the board into something and stabilize the USB + HDMI ports, I managed to tear them out once and repairing them later was not nice.
2. I wonder if it would be possible to speed up the Amiga, with a faster oscillator or by using XC6SLX9-3TQG144C with -3 instead of -2? not that I need it to be faster, because as I said, DIY is probably the fastest Amiga 500+, but that`s what came to my mind.

piotr_go wrote:

NO
Core with AGA under v1.9 will not be available.
v2.0 with FPGA in TQFP, you can`t count on any changes either. Negative number of free pins.
AGA will fit here.

ok, I understand, if it`s not a secret, what fpga 2.0 will it be based on and when will it be available for purchase (if there is such a plan)?
In the free version 1.9 I saw that there is a limit to the number of cors. Is this the only limitation compared to the paid version?
What does the current price list look like for the unblocked version?

Maybe I didn`t read something, but I wonder why there is this rs232 port in the old voltage logic, is it supposed to work with some old Amiga equipment?

sillycon wrote:

>>20974703

1. @Hetii you can devote your time and skills to the design of a 3D printing case

Unfortunately, I don`t have a 3D printer or any knowledge of CAD modeling, so I probably won`t be able to handle the casing.

In fact, the price for this Spartan has dropped, so the basket has already been updated with a lower price
Initially, I almost would have chosen quartz instead of a quartz generator, but in the end I had already chosen the one from item C7434931.

As for the 74HCT2G125, I`ll personally skip it for now, firstly, I don`t have an Amiga keyboard so I wouldn`t have anything to connect it to, and secondly,
that I plan to use this esp32 anyway so that the cables don`t get tangled, but that`s a distant future.

sillycon wrote:

2. I wonder if it would be possible to speed up the Amiga, with a faster oscillator or by using XC6SLX9-3TQG144C with -3 instead of -2? not that I need it to be faster, because as I said, DIY is probably the fastest Amiga 500+, but that`s what came to my mind.

It would speed up everything. Sound, video...

Hetii wrote:

what fpga 2.0 will be based on

Cyclone4, somewhere there are photos in thread 1.6.

Hetii wrote:

In the free version 1.9 I saw that there is a limit to the number of cors. Is this the only limitation compared to the paid version?

The first core does not have autoboot capabilities.

Hetii wrote:

What does the current price list look like for the unblocked version?

20USD

Hetii wrote:

Maybe I didn`t read something, but I wonder why there is this rs232 port in the old voltage logic, is it supposed to work with some old Amiga equipment?

Modem/nullmodem, maybe some PC equipment such as programmers.
Someone posted photos with a working browser.

Does anyone have this 18.432 generator for sale? Currently not available in TME
And maybe these 0805 0.75A fuses

xangel wrote:

Does anyone have this 18.432 generator for sale? Currently not available in TME
And maybe these 0805 0.75A fuses

I will be processing my order at lscs within a few days, so I can add something to the cart for you if you need it.

Thanks, I sent you a PM

Please tell me where the signals (CLOCK, Data, LATCH) from the NES pad (not SNES) are sent to the contacts of the JOY1 and JOY2 connectors? I'm trying to connect a Nes pad clone from aliexpress. Thank you.

Have you tryed SNES schematic from?:
https://github.com/piotr-go/DIY-A586/raw/master/v1.6/cores/nes/snes_pad_adapter.tar.gz
Unfortunately i don't have a NES pad to test.

I tried it. Nes pad does not work with this connection scheme (without PIC10F200). Could you please explain the role of IC1 in this circuit? Unfortunately, I don’t have a PIC10F200, maybe it can be replaced with another controller? And i don't have a SNES pad...

JOY1/2 are inputs only, and NES/SNES controller needs a clock.
https://www.fpgalover.com/images/manuals/SNES/2.jpg
PIC10F200 generates clock and latch signals.
You can generate them on different micro.

Thanks a lot! Now it’s clear that without a PIC no PAD will work. I understand this is arrogance, but could you please share the original PIC firmware?

Added after 4 [minutes]:

Source code, pls.

Unfortunately PIC assembler.

Thanks, I'll look into it. One more question. Function of pin GP3 in this circuit? Why is it connected to pin5 of con Z1?

PIC programming.

Thanks for the help and advice. I temporarily simulated a clock generator on an Arduino-nano and the NES pad works correctly according to the SNES pad circuit. Allow me one more question. How to connect a joystick to work with the Spectrum core?

Commodore joystick pinout:
https://c64blog.files.wordpress.com/2016/10/img_0358.png

This joystick works great with the mikan core, unfortunately it does not work with the Spectrum core.

Game must support Kempston interface.

Of course, I know about this. I've tried games that work with the Kempston interface on the original ZX Spectrum and on other emulators. Maybe I'm doing something wrong...

Try this one.

piotr_go wrote:

Try this one.

This core works with the Kempston interface, but pressed buttons are not decoded correctly. For example, the top and bottom have changed places.

One more try.

(corrected file below)

Unfortunately, the result is the same. The joystick works, but not correctly.

I'm guessing this schematic:
https://www.evolutional.co.uk/media/kempston/kempston-schematic.png
is not correct one?

What is the bit<->direction representation in Kempston?
I used:
D0 up
D1 down
D2 left
D3 right
D4 fire

Unfortunately, I lost my spectrum SD card somewhere and can't test this.

I think this circuit is correct.
https://sinclairzxworld.com/viewtopic.php?t=3242

OK, I found a bug.
When I converted from 1.6 to 1.9, I forgot to invert the signals.
Bit order was OK.

Wonderful! Now everything works correctly. Thanks a lot!

Hi
Sorry, I`m not very versed in FPGA and CPLD.
Before I solder the flash, should I program it on an external programmer?
This is what I did when I assembled the ZX-UNO-VGA-2M. Apparently it could have been done later, but apparently it was better before.
If so, where did the input come from? To start with, I`m interested in PC. What to upload, how to set the bus (QE and other things)?

I mean a mini-guide like this:
upload this and this to flash.
Upload this and that to Xilinx.
Put this and that on the card.

xangel wrote:

Apparently it could have been done later, but apparently it was better before.

Exactly.

xangel wrote:

If so, where did the input come from?

MAIN.BIN, it`s on github.

xangel wrote:

how to set up the bus (QE and these matters)

1-bit, WP/HOLD pins can be enabled.

To flash MAIN.BIN
Nothing is uploaded to Xilinx.
Put the roms (those from A500/A600) and "SD_v0.10.ROM" on the card (change the name to "SD.ROM"), and from the card use F4 to upload them to the flash (format first).
Put cores (*.d19) on the card and use Insert to load them into flash.

Roms must be named "KICK13.ROM" "KICK31.ROM" "KICK321.ROM"...
It will display if something is missing.