FPGAmstrad on ZX-Uno - a little 2011's cool fork

[freemac]

Hi,

Jepalza has ported the principe of conception Xilinx 2011 FPGAmstrad version on ZX-Uno, so then I bought on (65€ this little one), and help him realizing a first stabilised version.


https://www.youtube.com/watch?v=tpr9xxx1rsA

ZX-Uno has the same chip size than one I used in 2011 (100% of chip used...). So normaly I can reach the "candidate 002".
http://www.cpcwiki.eu/index.php/FPGAmstrad#Video

It is a very light version (no dsk write access, 640x480, MEM_wr WAITn generator...), but easy to use, and having a clean simple code source (no options addons) that match fully with the FPGAmstrad wiki story.

May interest ones having a ZX-Uno

Efforts done here :
- I removed the pll that was not determinist, and I recalibrated all clocks
- merge of SPI/FAT32 part, SDHC compatible : up to 4GB files inside (can use a 32GB also but filled less than 4GB of files)
- merge of PPI
- merge of interrupts
- page-up key does reset+insert next disk, if you do a continuous pressing it does increment inserting this way a quite of "random disk", after last disk, the first one is re-inserted
- merge of PWM (high quality sound, but mono)
- my joystick is not running fine on my own ZX-Uno, normaly mapped
- keyboard merged

TODO :
- merge of CRTC0
- joystick validation

[AxelStone]

This makes ZXUno more interesting to buy 

[freemac]

Another set of efforts done :
- CRTC0 => colors are now fine
- Stereo
- Carousel (robustness around re-inserting disk 1 after last disk)
- Vertical border
- FAT32 erased file detection
And then (no youtube video yet for this next one realise) :
- WAIT_n generator : removed the "MEM_wr" stuff that was invalided until => Arkanoid is then at nice speed, RAM of ZX-Uno are enough robustness

TODO :
- joystick validation
- merge of PPI
- robustness of quick-reset button, whatever games
- display calibration (one pixel h and one pixel v)

I think I can give a little last effort run on it next week. And then normaly I'll got a full merged version (around the "valided" part of FPGAmstrad)

Code: [Select]

WARNING:Route:464 - The router has detected a very dense, congested design. It is extremely unlikely the router will be able to finish the
   design and meet your timing requirements. To prevent excessive run time the router will change strategy. The router will now work to
   completely route this design but not to improve timing. This behavior will allow you to use the Static Timing Report and FPGA Editor to
   isolate the paths with timing problems. The cause of this behavior is either overly difficult constraints, or issues with the
   implementation or synthesis of logic in the critical timing path. If you are willing to accept a long run time, set the option "-xe c" to
   override the present behavior.
  Intermediate status: 929 unrouted;       REAL time: 3 hrs 35 secs3 hrs 35 secs 

Last week I solved a stupid thing slowing down the compilation time around three hours per launch, now it's fine, I'm becoming crazy 

[Gryzor]

Now that's a temptation...

[freemac]

https://www.youtube.com/watch?v=CXetrNOD8l8
Littles updates for this little platform :
- Z80 updated (thanks Sorgelig)
- VGA 800x600@72Hz (because strangly it did shake with VGA 640x480)

Here two CPCRetroDev2019 games running on it 

[berks]

This is really good. I've got a zx-uno, but the CPC cores were a bit of an afterthought. Thanks for bringing this one!