Activity

From 08/08/2017 to 09/06/2017

FO 09:44 PM Feature #55: Replace main CPU: I've managed to get the spinal HDL project compiled, so now have a verilog or vhdl file for the CPU. It seems to have 3 ports. Instruction master, data master and debug slave. So I will need to map them into wishbone. They are also in th... foft

FO 01:40 PM Feature #55: Replace main CPU: To Panos' comment. Yeah I'd love some help, if someone could help me define the memory map and write the firmware for the RISC V that would be an enormous help. There are also many HDL parts that need doing if anyone fancies working on t... foft
FO 01:37 PM Feature #55: Replace main CPU: There are several problems with the current setup:
* The firmware is constrained by the current ZPU setup. Its hard to debug and tricky to add more memory to it.
* I'm struggling to meet timing requirements, due to the over-complex int... foft

SA 11:00 AM Feature #55: Replace main CPU: 917k wrote:
>Sounds cool. I am wondering what this will do for the project, I mean what would this actually mean to the end user?
Βeyond the technical part that I really do not fully understand, I think is an effort of Mark to stimul... sadosp
91 09:14 AM Feature #55: Replace main CPU: Sounds cool! 917k
91 08:58 AM Feature #55: Replace main CPU: Sounds cool. I am wondering what this will do for the project, I mean what would this actually mean to the end user? 917k

SA 10:59 PM Feature #55: Replace main CPU: foft wrote:
> So I'm now thinking about ditching my address decoder rework and doing something more fundamental.
> ...
:-)
sadosp
FO 09:06 PM Feature #55: Replace main CPU: So I'm now thinking about ditching my address decoder rework and doing something more fundamental.
Using this CPU to build a complete system with a large linear address space. With SDRAM, block ram, custom chips, pbi and the 'zpu regs... foft

FO 09:52 PM Back from holidays: I'm back from my holidays. I didn't find much time to work on this, a few hours here and there. The address decoder/bus master priority logic rework is taking shape and looking much neater - it was long overdue. I estimate about a days s... foft
FO 09:46 PM Feature #58: Maybe consider moving CART selection closer to top in F12 menu ?: Yes I agree this makes sense. I'd like a wider review/redesign on the firmware, there is a lot of scope for improvement. I'd really like it if someone else could pick this up so I could focus on the hardware aspect, any takers? foft
FO 09:43 PM Bug #57: Ballblazer playfield has issues after firing in v14: Pleased its a non-issue:-) Did you try this version on a real NTSC system? foft

ZZ 02:53 AM Bug #57 (Closed): Ballblazer playfield has issues after firing in v14: zztop wrote:
> I'm seeing issues with Ballblazer on HDMI (NTSC), included in "Games Menu 1" on SDcard.
> ...
I just tested a different stand-alone Ballblazer .car file and it does not seem to have this problem.
My guess is that the ... zztop

ZZ 05:04 PM Feature #58 (Closed): Maybe consider moving CART selection closer to top in F12 menu ?: It seems to take more keystrokes/effort than necessary to joystick/arrow down to CART selection. (especially during testing)
Wouldn't it make more sense to move CART closer to top of selection, or maybe default to it when entering F... zztop
ZZ 04:53 PM Bug #57 (Closed): Ballblazer playfield has issues after firing in v14: I'm seeing issues with Ballblazer on HDMI (NTSC), included in "Games Menu 1" on SDcard.
The playfield seems to desynchronize after shot is fired. (but it may take a missing shot or 2 to activate this effect?)
Can anyone else confir... zztop

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