Author Topic: Official Overscan Invaders request.  (Read 4560 times)

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Offline Official Ninja

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Official Overscan Invaders request.
« on: 04-02-2014, 18:02:37 »
This is the official request thread for overscan invaders.  :D


Offline Petari

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Re: Official Overscan Invaders request.
« Reply #1 on: 05-02-2014, 09:42:44 »
You are very official type of gamer :)
Actually I started on joystick fix already. However, there are reasons why programmer self made not joystick option here. Used horizontal overscan with extensive Timer-B usage kills joystick command transfers (mouse commands too). Only single-byte keyboard commands work. All this is because special way how IKBD-ACIA-MFP-CPU system works.  Additionally, emulators emulate it not properly, and as I see even Steem SSE with 'True IKBD' emulation is not enough accurate.  Anyway, I have some progress, and need more tests on real HW to see is it possible at all.
Will be informed soon ...

Offline Official Ninja

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Re: Official Overscan Invaders request.
« Reply #2 on: 05-02-2014, 23:13:15 »
Sounds difficult.

Another Budgie game worth looking at is the Galxian clone: Quest for Galaxia.
It looks like it would be another very fun game in this genre but on my Mega STe no controls work at all.
Not even the keyboard.

Offline Anemos

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Re: Official Overscan Invaders request.
« Reply #3 on: 06-02-2014, 16:48:18 »
Some good Titles of Budgie UK

G-orb
Mr. Dig
Perils of Penfold
Crystal Caverns
Bert the Squirt
My system: Atari STE 4MB, OS: SuperTOS 2.06, HD: US/disk 4gb SDcard ,ppera v0.98 HD drivers, USB mouse adapter by me, PSX controller joy adapter by me,  full list of adaption,s games by Petari.
Second Atari machine: 1040 STF
Other: 2X Lilliput Atari 130 XE

Offline Official Ninja

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Re: Official Overscan Invaders request.
« Reply #4 on: 17-02-2014, 18:57:20 »
Thanks for Galaxia.
Any word on Overscan Invaders or is it looking doubtful?

BTW- I played the ANDROM game at 16Mhz on my MSTE and it made the screen shake like mad.
8Mhz worked just fine so no biggie.

Offline Petari

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Re: Official Overscan Invaders request.
« Reply #5 on: 28-02-2014, 11:25:52 »
I tried a lot of things with Overscan Invaders. But nothing worked on real Atari . The problem is that there is not enough time to transfer joystick status packet - what is 2 bytes, in only 3mS available . From 20mS for 1 frame (as works at 50Hz), only 3 mS is available for it. Keyboard works because it needs only 1 byte. And is not reliable because interrupts are disabled 95% of time. Solution would be to speed up baudrate, but ACIA chip and IKBD chip have no other common baudrate. So, it seems that it is not possible.

Offline qq1975b

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Re: Official Overscan Invaders request.
« Reply #6 on: 09-01-2015, 11:55:13 »
knowing nothing about programming...but...using a buffer would help? will need more ram than 1MB I suppose.

EDIT: I meant buffer not cache  :P
« Last Edit: 19-01-2015, 12:19:25 by qq1975b »