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Old 24 December 2020, 22:53   #1
Havie
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Space Invaders

Here is my Space Invaders that started as a question about source code in the Blitz Basic coding thread. After putting together a demo, I got sucked in to making a full version of the game as close to the original as possible!

Still a few things to do and no doubt some bugs will be found but all comments most welcome...

https://eab.abime.net/zone/Invader.adf

Original thread here:

https://eab.abime.net/showthread.php?t=104414&page=3
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Old 25 December 2020, 01:59   #2
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Cool, thanks Havie

Will take a look now before bed
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Old 25 December 2020, 02:04   #3
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and to edit https://eab.abime.net/showthread.php?t=85200

(oh and I thought: no links to the zone too ...)
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Old 25 December 2020, 02:22   #4
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Quote:
Originally Posted by jotd View Post
and to edit https://eab.abime.net/showthread.php?t=85200

(oh and I thought: no links to the zone too ...)
Sorry - are links to zone not allowed? If not, I'll happily unlink and upload tomy website instead (which I will do in due course). Cheers.
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Old 25 December 2020, 02:24   #5
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Quote:
Originally Posted by jotd View Post
and to edit https://eab.abime.net/showthread.php?t=85200

(oh and I thought: no links to the zone too ...)
Sorry - are links to zone not allowed? If not, I'll happily unlink and upload to my website instead (which I will do in due course).

Cheers.
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Old 25 December 2020, 02:34   #6
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Gave it a quick go. Very cool, feels very much like the original. I'm assuming it's 1 bitplane with copper rainbow for green at the bottom of the screen?
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Old 25 December 2020, 02:35   #7
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Quote:
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Sorry - are links to zone not allowed? If not, I'll happily unlink and upload to my website instead (which I will do in due course).

Cheers.
Of course it's ok to upload files to The Zone!

The reason why the rules state that you shouldn't post direct links is as follows:

Quote:
Originally Posted by Paul
Also Please don't direct link to files in The Zone when creating a 'new thread' or 'replying to a post', because files in the zone are auto deleted !
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Old 25 December 2020, 02:40   #8
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Of course it's ok to upload files to The Zone!

The reason why the rules state that you shouldn't post direct links is as follows:
Doh - that makes complete sense. Will rectify in the next few days...

Thanks for setting me straight.
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Old 25 December 2020, 02:46   #9
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Doh - that makes complete sense. Will rectify in the next few days...

Thanks for setting me straight.
It's no biggie

People don't get warnings or bans for posting The Zone! file links
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Old 25 December 2020, 03:00   #10
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I'm not sure I should add to that thread; is it really a port?

Were the Arcade graphics ripped / used etc...
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Old 25 December 2020, 08:20   #11
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Yes - it's arcade graphics and basically a port. It follows the arcade game as closely as possible - invader movement and firing pattern, ufo movement and scoring - all based on original source code. Even emulates coloured overlay using the copper. Not 100% perfect but pretty close.
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Old 25 December 2020, 08:33   #12
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Quote:
Originally Posted by earok View Post
Gave it a quick go. Very cool, feels very much like the original. I'm assuming it's 1 bitplane with copper rainbow for green at the bottom of the screen?
It's actually 2 bit planes as I needed a non-transparent black because everything is directly blitted to the screen with a black border and erases what was there. No double buffering required. Also, at the bottom there are two colours in the same row as the green overlay didn't rurun across the whole screen at this point.

Thanks for trying it - I think it feels like the original.
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Old 25 December 2020, 14:16   #13
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Quote:
Originally Posted by Havie View Post
Yes - it's arcade graphics and basically a port. It follows the arcade game as closely as possible - invader movement and firing pattern, ufo movement and scoring - all based on original source code. Even emulates coloured overlay using the copper. Not 100% perfect but pretty close.
Alrighty, perfect

...now added to the Ports / Conversions --> Amiga thread.
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Old 25 December 2020, 17:56   #14
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now new challenge, re-do a game starting with "A" so you can be listed before my remake

just tried it: it's the original in all it's pseudo monochrome greatness.Even the crappy fonts are there. Excellent.

Last edited by jotd; 25 December 2020 at 18:03.
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Old 26 December 2020, 03:52   #15
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Still a few things to do and no doubt some bugs will be found but all comments most welcome...
Really nice work so far, but you've got the shooting sound effect and the exploding-invader sound effect the wrong way round...
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Old 26 December 2020, 05:14   #16
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I just seen this and look very good: something is missing at least for me, though:
- ever thought to use the other playfield to make the effect of the background in the upright cabinet, where there was a 45 degrees glass so to show the screen mixed with it? (have the feeling somebody did ask for it)
This should be the front overlay


And this is how was looking



- is missing the MODEL RACING label in the bottom that was present in the cabinets in italy in my area (was by the way an italian company not too far from my place that distributed officially space invaders for taito and also did its own arcade games)
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Old 26 December 2020, 07:04   #17
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Very nice port, good job!
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Old 26 December 2020, 11:45   #18
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Old 26 December 2020, 11:47   #19
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Quote:
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Really nice work so far, but you've got the shooting sound effect and the exploding-invader sound effect the wrong way round...
Thanks - didn't realise, easily fixed.
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Old 26 December 2020, 11:51   #20
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Quote:
Originally Posted by saimon69 View Post
I just seen this and look very good: something is missing at least for me, though:
- ever thought to use the other playfield to make the effect of the background in the upright cabinet, where there was a 45 degrees glass so to show the screen mixed with it? (have the feeling somebody did ask for it)
This should be the front overlay


And this is how was looking



- is missing the MODEL RACING label in the bottom that was present in the cabinets in italy in my area (was by the way an italian company not too far from my place that distributed officially space invaders for taito and also did its own arcade games)
Yes - I have the background and was considering adding this as an option using dual playfield mode but need a decent version in 8 colours for OCS/ECS and a 16 colour version for AGA (my efforts were poor). If someone were to make it then I will add it as an option as increasing number of bit planes should affect speed.
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