exxos's Atari, Amiga & retro forum

terriblefire wrote: 31 Jul 2022 20:36 done some more work on this today. To save people time the following demos do not quit nice. Its a shame but they cant be included

Grind.
eld-dust
eld-riseandshine.

That is surprising because if you look at the last frame of the following video... it exits to AmigaOS. I wonder if there was a "final" release?

Higgy wrote: 31 Jul 2022 21:47 Ah that is a shame, those are good demos for showing off 060 power.

An idea. You mentioned using the NVRAM. Is it possible to save a flag for CPU speed? So the initial boot you would set a speed that just this demo CD reads. Some people might not be able to pass 50Mhz, but others could have fans etc and sit at a higher MHz no problem. And a lot of 060 demos love extra MHz.

(Thinking about it, I suppose we will be burning the image once done, so I guess we would be free to set 'Setspeed Speed=' in the startup -sequence. The NVRAM option would be cleaner and allow easier sharing of the finished .ISO)

Yeah TBH this is a software thing. The NVRAM tools i've found are confusing tbh. I just want a command line tool to save and restore some environment variables.

alexh wrote: 01 Aug 2022 08:39
That is surprising because if you look at the last frame of the following video... it exits to AmigaOS. I wonder if there was a "final" release?

i'm testing on FS-UAE and it gets into a state at the end

alexh wrote: 01 Aug 2022 08:58

Code: Select all

https://files.scene.org/get/parties/2020/gerp20/amiga_demo/fd_1992.zip,fd_1992,runme.bat

I like this one but the end credits loop forever. So cannot use it.

They must exit without interaction.

terriblefire wrote: 01 Aug 2022 18:18

alexh wrote: 01 Aug 2022 08:58

Code: Select all

https://files.scene.org/get/parties/2020/gerp20/amiga_demo/fd_1992.zip,fd_1992,runme.bat

I like this one but the end credits loop forever. So cannot use it.

They must exit without interaction.

Ok i have found a way to make them exit after X seconds if the floppy drive is still clicking during the demo.

I've made a good deal of progress on this and have built an ISO and sent it to a few to test.

Huge help from @erique. We found some demos that would not run from CD but were fine from read only hard disk. With much checking/debugging we found that the CDFS.LIBRARY in the CD32 does not handle SEEK from the end of a file due to a sign bug. This means that any executable with HUNK_OVERLAY (which demos tend to do to save ram?) will fail to load.

The code in cdfs.library deals with SEEK_END as .. .
Which is wrong... When you pass a offset from the end of the file you pass a -ve number. So we had to patch 2 locations from a sub to an add..

I then got the cd to loadmodule DOWNGRADE cdfs.library and bingo. The demos now run.

Cool.

I don't own a TF360 but when I eventually do, I know I'll want something like this.

So a couple of people have been testing the demo cd and observed that the CD drive speed is frankly pitiful. I still want to produce this for lulz but it might push me into thinking about improving the cd speed on the cd32.

Would it improve CD performance by simply adding buffers in AmigaOS? Will the CD32 AmigaOS CDFS then read-ahead?