MiSTer FPGA Forum

Space Invaders:

- Add freeplay option to some of the games (a bit like the Coin-Up device for real cabinets)
- Add mouse / trackball control for "Shuffleboard" so it is now playable.
- Update SYS

Arcade Bally Astrocade
- Freeplay option for Space Zap
- Improved sound mixing
- Update SYS

Arcade games - Crazy Balloon, Cosmic Guerilla, Cosmic Z80 and Astrocade
- Update framework

I've added a DIP to the Polaris MRA that allows you to 'overclock' the CPU and that seems to reduce the flicker.

It may have other effects as well, but gameplay seems the same to me!

It only affects polaris, and cannot be enabled for any of the other games supported by the core.

pgimeno wrote: ↑Sun Nov 26, 2023 9:46 am

With this core, I see shots disappearing in Space Invaders. Especially when shooting from approximately the middle of the 3rd and 4th bunkers. Reverting to the previous version of the core fixes it.

Flicker not caused by that then, will revert and see if I can find another reason - Cheers

I made a few changes, updated the SYS files and have completed Polaris.MRA

need to do a pull request, but if someone wants to check this first ...

Looking at the core it seems (to me) that it is calling the interrupts back to front (it does one mid frame and one at end frame)

changing that to call them in the opposite order and the flashing sub stops flickering

need to check that it doesn't break anything else in the core (and maybe add some visible screen update to confirm my suspicion)

I had a look, it basically works but does not look like it uses P2 controls plus the sound is totally wrong (if it makes any)

Also for some reason the sub 'flickers', not sure why that is, it even does it if you set it to B&W so it draws it in white.

I've been doing some changes on the arcade version to fix a few problems, but one is the difference in colours.

Can someone try this version and see if the colours now match the original a little closer.

Thanks

When I get my galaxian PCB working again, I'll bung a scope on the various chips and see what waveform it creates and then see if any changes need to be made to what is there to get it a bit closer to reality.

New arcade core: Cosmic Guerilla

TMS9980 based game from Universal

HerrBerzerk wrote: ↑Tue Apr 04, 2023 11:53 am

Great game, played it a lot. How about the sound? Did you use samples or is the sound already digital?

All analogue so until I get my maths degree it's done using samples.

toaks wrote: ↑Sat Mar 04, 2023 5:13 pm

Anyone know if there are any plans to update to older arcade cores to support shadow masks?

If you list out which ones have not been done yet then someone may pick them up and update them.

Peter-FPGA wrote: ↑Wed Mar 01, 2023 3:24 pm

Acorn BBC and master support for normal disk and tape images, at the moment it only works with mmc images.

Disks now work on Master since AlanSW added DFS support - go into the settings and change the default boot and pick a disk to use.

You don't get the option on BBC B (yet!) - have to see how tricky it is to add.

Professor pacman ran on a version of the bally astrocade hardware with different graphics hardware giving 16 colours and it also had masses of banked rom (768k)

it uses the same custom chips used by Gorf, Wizard of Wor, Robby Roto etc.

Fixed the aspect, added DIPs to mra (except coinage, since code for IO chip does not take any notice anyway)

Added some code to zero the DAC when it plays other sound effects (Grobda leaves it set to $07)

Please test this whilst I sort out what needs to be checked in as a pull request.

I've not done the DIPs yet, but self test, controls and speech should now be fine and I have tried some of the other games and they still seem to work.

so whilst I sort out DIP settings for Grobda, can you please do some testing and make sure that all of the other MRAs using this core still work as expected.

I have the shield button working and it now passes the self test.

Just need to tidy up the code and add the DIPS and DAC port.