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Search: Posts Made By: frank_b
Forum: support.Other 06 October 2018, 10:03
Replies: 7
Views: 249
Posted By frank_b
You should be able to use easyadf from amiga kit...

You should be able to use easyadf from amiga kit and cross dos on your 1200 for this. :)
Forum: Retrogaming General Discussion 28 September 2018, 11:20
Replies: 29
Views: 1,203
Posted By frank_b
No. Certainly not. It is nowhere near as elegant...

No. Certainly not. It is nowhere near as elegant as the original design. Everything extra s compromised. The sprites can't be reloaded as there's no DMA register for the extra control words. You...
Forum: Coders. Asm / Hardware 19 August 2018, 22:55
Replies: 539
Views: 16,239
Posted By frank_b
How far can you conditionally branch in a 68k vs...

How far can you conditionally branch in a 68k vs an 8086? It's +-32k on the 68k vs +-127 bytes (yikes) on the 8086.

Here are some other interesting questions.

How many registers do you have...
Forum: Coders. Asm / Hardware 14 August 2018, 19:18
Replies: 539
Views: 16,239
Posted By frank_b
Anything is better than the 8086. I like the 6502...

Anything is better than the 8086. I like the 6502 and the 68000. The 8086 is frickin' hideous.
Forum: Amiga scene 09 August 2018, 21:00
Replies: 128
Views: 7,999
Posted By frank_b
Reading the HRM 25 years later and STILL being...

Reading the HRM 25 years later and STILL being impressed. The Amiga wasn't a computer. It was a work of art.
Forum: support.Hardware 03 August 2018, 09:04
Replies: 25
Views: 1,587
Posted By frank_b
It was an amazing chip in 1993. There must be...

It was an amazing chip in 1993. There must be faster versions around these days :)
Seems it topped out at 250 mhz in 2010.
Forum: Nostalgia & memories 10 July 2018, 16:39
Replies: 106
Views: 11,888
Posted By frank_b
My pet peeves. 1) Same 7 mhz cycle access as...

My pet peeves.

1) Same 7 mhz cycle access as ECS/OCS. I *bet* the 1200 was going to ship with a 68000 oroginally! I think they were going for 100% compatibility on games.
2) Bank switched...
Forum: Coders. General 09 July 2018, 17:14
Replies: 587
Views: 46,554
Posted By frank_b
Add a bus master one to the sidecar slot. It...

Add a bus master one to the sidecar slot. It could run much faster to/from fast RAM and cover the full address range.
Forum: Coders. General 09 July 2018, 16:06
Replies: 587
Views: 46,554
Posted By frank_b
like leaky batteries :D

like leaky batteries :D
Forum: New to Emulation or Amiga scene 09 July 2018, 12:02
Replies: 45
Views: 2,839
Posted By frank_b
If you mean in comparison to a 16 bpp display I'd...

If you mean in comparison to a 16 bpp display I'd have to disagree.
Ham8 is far inferior compared to the flexibility of a high colour or true colour display.
Forum: Coders. General 07 July 2018, 18:54
Replies: 587
Views: 46,554
Posted By frank_b
I know how to write a fast software sprite...

I know how to write a fast software sprite routine ;)
https://www.exxoshost.co.uk/atari/last/blitter/index.htm

The one in the linked intro above at the end of the page calculates the masks on...
Forum: Coders. General 07 July 2018, 16:09
Replies: 587
Views: 46,554
Posted By frank_b
You could buy 4 meg STe machines direct from...

You could buy 4 meg STe machines direct from dealers back in the day. Industry standard SIMM sockets. It's stock in that there's nothing fancy added like an accelerator card. You can add fast RAM /...
Forum: Coders. General 06 July 2018, 21:49
Replies: 587
Views: 46,554
Posted By frank_b
Ok I will do the math for 500 16*16 sprites at...

Ok I will do the math for 500 16*16 sprites at say 16 colours with the CPU.

You're reading 2 bytes per line per plane * 16 for the sprite: 2*4*16 = 128 bytes.
The mask takes 2 bytes per line * 16...
Forum: Coders. General 06 July 2018, 18:42
Replies: 587
Views: 46,554
Posted By frank_b
Cho ren sha has up to 4000 sprites on screen or...

Cho ren sha has up to 4000 sprites on screen or something equally crazy. Forget about that on a non 060 1200. I'm talking about the arcade ports here. That's more feasible.
Forum: Nostalgia & memories 06 July 2018, 18:38
Replies: 106
Views: 11,888
Posted By frank_b
The half speed (7 mhz vs 14 mhz) is the wait...

The half speed (7 mhz vs 14 mhz) is the wait state. The ROM is likely running at 14 mhz however. Amiga reloaded will allow the 020 to hit chip RAM at full 14 mhz speed regardless of what the chipset...
Forum: Coders. General 06 July 2018, 16:57
Replies: 587
Views: 46,554
Posted By frank_b
A full 68k bus master blitter, with the same...

A full 68k bus master blitter, with the same register interface as the Amiga would be a hell of a nice USP for new ACA 500 cards. :D
Would do wonders for fblit too.
Forum: Coders. General 06 July 2018, 16:27
Replies: 587
Views: 46,554
Posted By frank_b
Chuck hardware at it? Why not? :) There will be a...

Chuck hardware at it? Why not? :) There will be a Falcon version too. A500 owners will be out of luck though. It's possible on a stock 8 mhz STe however. It would be good to see a version on the...
Forum: Coders. General 06 July 2018, 14:21
Replies: 587
Views: 46,554
Posted By frank_b
That said you could probably get away with...

That said you could probably get away with storing all the sprite data for the player in fast RAM. CPU could just copy into the chip ram buffer and adjust the positing via control words. That would...
Forum: Coders. General 06 July 2018, 13:00
Replies: 587
Views: 46,554
Posted By frank_b
Performance gains from using sprites won't help. ...

Performance gains from using sprites won't help. The issue is the memory usage required and the performance hit from buffering from fast to chip on a 68k machine. I already gave some rough estimates...
Forum: Coders. General 06 July 2018, 10:33
Replies: 587
Views: 46,554
Posted By frank_b
How much memory is required for the graphics? ...

How much memory is required for the graphics? This version needs 4 meg of unified memory on an STe. It may exceed even 2 mb of chip RAM for some levels.
Masking performance should be similar on...
Forum: Retrogaming General Discussion 18 June 2018, 19:03
Replies: 145
Views: 7,175
Posted By frank_b
That would solve the scarcity of CD32 controllers...

That would solve the scarcity of CD32 controllers quite nicely! :)
Forum: Coders. Asm / Hardware 01 May 2018, 08:02
Replies: 17
Views: 944
Posted By frank_b
Try TAS from chip RAM on a 500..Buzzing black...

Try TAS from chip RAM on a 500..Buzzing black screen of death and a trip to the power button!
Forum: Coders. General 21 April 2018, 17:55
Replies: 587
Views: 46,554
Posted By frank_b
Conversions and porting. Not the same thing ;) ...

Conversions and porting. Not the same thing ;) One is harder than the other. No source code on a binary conversion ;) Reversing games is challenging from personal experience. I did it commercially...
Forum: Coders. General 20 April 2018, 16:20
Replies: 587
Views: 46,554
Posted By frank_b
What happens if the weaker system wasn't taken...

What happens if the weaker system wasn't taken into account when the game was designed? Sounds like the game would have to be hacked to bits or significant time would be spent optimising every last...
Forum: Coders. General 20 April 2018, 09:18
Replies: 587
Views: 46,554
Posted By frank_b
I'm sorry but you may have misunderstood. That's...

I'm sorry but you may have misunderstood. That's completely wrong. It is more time consuming to port downwards.
Forum: Coders. General 19 April 2018, 19:42
Replies: 587
Views: 46,554
Posted By frank_b
Sorry but a game dev is always going to prefer to...

Sorry but a game dev is always going to prefer to port upwards. It's easier and time is money. There is no reason why the more powerful machine version can't be tweaked however. A port isn't...
Forum: Coders. General 06 April 2018, 20:10
Replies: 587
Views: 46,554
Posted By frank_b
Not enough chip bandwidth for six bit high res...

Not enough chip bandwidth for six bit high res ham.
Forum: Coders. General 06 April 2018, 17:00
Replies: 587
Views: 46,554
Posted By frank_b
The only major oddity was that it wasn't fully...

The only major oddity was that it wasn't fully compatible with the 68k. TAS <cough>
Forum: Retrogaming General Discussion 06 April 2018, 00:47
Replies: 35
Views: 1,333
Posted By frank_b
Fixed point coordinates perhaps? It's possible to...

Fixed point coordinates perhaps? It's possible to have a 50 hz game update on screen objects with fractional fixed point values. That way every object doesn't have to move at a linear 50 fps.
Forum: Coders. Asm / Hardware 30 March 2018, 18:42
Replies: 9
Views: 681
Posted By frank_b
He's using the halftone/smudge mode for some free...

He's using the halftone/smudge mode for some free effects in real time. Looks like it maxes out at 16% CPU time. Impressive!!!
https://www.youtube.com/watch?v=Xc0zv4YFitI&feature=youtu.be
Forum: Coders. Asm / Hardware 30 March 2018, 16:32
Replies: 9
Views: 681
Posted By frank_b
Bear in mind the Atari blitter has an indirect...

Bear in mind the Atari blitter has an indirect addressing mode and 16 word look up table built in. That can be combined that with first/middle/last word masks protecting selected bits in the...
Forum: Retrogaming General Discussion 27 March 2018, 18:30
Replies: 197
Views: 8,316
Posted By frank_b
They weren’t difficult to get ahold of at the...

They weren’t difficult to get ahold of at the time. I have one. Nowadays they are astronomically expensive. One went recently for 1100 euros on eBay.
Forum: Retrogaming General Discussion 20 March 2018, 08:26
Replies: 65
Views: 2,644
Posted By frank_b
Both feet, both barrels. :(

Both feet, both barrels. :(
Forum: Retrogaming General Discussion 20 March 2018, 07:30
Replies: 65
Views: 2,644
Posted By frank_b
What's the excuse for AGA then? :( The Amiga died...

What's the excuse for AGA then? :( The Amiga died because it didn't evolve quick enough.
Forum: Retrogaming General Discussion 20 March 2018, 07:19
Replies: 65
Views: 2,644
Posted By frank_b
AGA is outclassed by the Megadrive for scrolling...

AGA is outclassed by the Megadrive for scrolling games. Far more sprites and twice as many 16 colour scrolling layers. The dictionary definition of too little, too late.
Forum: Retrogaming General Discussion 20 March 2018, 07:17
Replies: 65
Views: 2,644
Posted By frank_b
I wonder if CD32 users ever complained about OCS...

I wonder if CD32 users ever complained about OCS ports? :)
Forum: Retrogaming General Discussion 19 March 2018, 21:50
Replies: 65
Views: 2,644
Posted By frank_b
Devil's advocate time. How many excellent games...

Devil's advocate time. How many excellent games wouldn't have been released on the Amiga at *ALL* if they weren't ported from the ST due to the size of the Amiga market at the time? What would have...
Forum: Amiga scene 18 March 2018, 15:18
Replies: 202
Views: 27,945
Posted By frank_b
Well the Falcon has to do c2p here too as it's...

Well the Falcon has to do c2p here too as it's still using an 8 bit screen.
Seems like the audio was offloaded to the DSP. The Ct60 has a more modern memory interface. Video RAM access is quicker...
Forum: Amiga scene 17 March 2018, 19:47
Replies: 202
Views: 27,945
Posted By frank_b
That's a whole load of awesomeness for one single...

That's a whole load of awesomeness for one single desk!
Forum: Retrogaming General Discussion 11 March 2018, 11:21
Replies: 67
Views: 3,271
Posted By frank_b
There are worse examples. At least SpeedBall II...

There are worse examples. At least SpeedBall II was a fantastic game. Their art was generally better than most other games anyway.
I'm thinking of games which could have the scrolling or frame rate...
Showing results 1 to 40 of 403

 
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