Making a start on 5200 support. GTIA needs to expose full consol output for this. So far just removed chips from custom top level and made address decoder adjustments.
Added reset to noise filter (helps for sim), fixed inversion on poly5.
Remove inversion
Match more closely to schematic - delay/inversion
noise delay between channels. Apply force break to two tone.
It is important when we sample and when we toggle. Fixes "clarinet".
Changes for Aeon lite - notably 1MB ram support and ise build warnings fixed
Merged aeon lite 1MB memory support
Fixed length
switch to signed samples - which replay and sigma delta want!
Added scanlines support
Added chameleon version
Added generic for Aeon_lite. vars need setting up though.
Fixed throttle...
Cleaned up main, so only 1 copy of core bits. Created aeon lite rom
Mix covox and gtia as if they were pokey channels. Increase precision to allow 8-bit covox channels. Its not clear how gtia and covox really clip with pokey channels - that would need research. For now this improves volume.
Added option for OSB internally
tb tweaks
Added DE1 ROM
Allow more than 4 bits of precision
Not 100% sure why but this change from a while ago breaks the mist and de1 sdram versions. Need to investigate futher but reverting for now.
Added 32-byte write support to ROM area! For MIST external sector buffer. TODO: Smarter method...
Remove stale files - creates output directly where needed...
Added simple dma for faster sd card reading
Use F5-F8 for Help,start,select,option. Use F1-F4 for F1-F4!
Fix memory_data_in missing from sensitivity list
Add start of antic testbench
Make more resilient to slow ram accesses. Needs more work/testcases etc for this really.
Allow SPI clock speed to be set by generic. It was running at half speed for 28MHz platforms vs 58MHz platforms. Need to improve spi speed since byte wise writing is too slow loading roms - 8 seconds on startup!
Antic refresh always takes one original cycle - this fixes turbo mode up to 4x on mcc
Added fkeys
Added missing spi component! Fix pokey instantiation. Fix pause.
Connect up snoop to allow ZPU to see the data it requested
Always complete sram request if we have no sram
Fixed turbo
No need for mmu to deal with refresh at all
Add an additional internal rom option - internal_rom=2, which for now just loops reading/writing 4 bytes. e.g. for testing new RAM setups
Re-connected SDRAM to DE1
Pass through video bigs
Added video bits to generic, since I am having to adjust this everywhere.
to_01 silenced sim, but caused build issues on Xilinx. If its invalid use 0
to_01 silenced sim, but caused build issues. If its invalid use 0.
Pass through some PBI signals needed for SDRAM
Expose pots, lightpen. Fix joystick bit ordering comments.
added ps2_keys_reg to sensitivity list (was missing)
Split ROM into its own process, to make it easier for Quartus to infer
Split up into 2 sections. Quartus will not infer the ram block with it mixed
Clock pause by pokey enable, so its a fixed speed even if system clock 28MHz,57MHz or otherwise
Renamed poly_* to pokey_poly_* since it is part of pokey
Cleaned up ZPU into slightly more generic form, though still clearly atari core targetted. Added inital tb, though needs rom to verify more. MIST sector side removed, but should be possible with external changes. Now ZPU instead has lots of GPIO.
Allow palette selection - with one option GTIA direct to allow external scandouble (with less memory)
Renamed sim script to match
Compiled/ran helloworld in sim. Appears fine...
First cut at simple toplevel for the atari800xl - needs checking with isim...
Make these generic to support Replay (28MHz) and the rest (57MHz)
Current unmerged vhdl for my Atari800 core and start at merging them into one tree with a common core