Chipset type: OCS / ECS Agnus

What is exactly the difference between these two options?

I read the description, help file, faqs, tech details around the known part (indexed) of Net, but none of these can explain an interesting anomaly.


1) I have a real Rev5 A500, KS1.3(v34.5) with 512Kb Chip RAM soldered on board and additional 512Kb Slow RAM in trapdoor. Just for a record, here comes an info on some particular custom chips found inside:
- FatAgnus 8371 P/N 318071-01 (PAL version, only 512Kb CHIP capable)
- Denise 8362R8 (no Super-Hires capable)
This is unmodded machine, manufactured in mid 1989, WestGermany.

2) Original F-16 CombatPilot floppy disk, still in good shape, was transferred to PC via transdisk. Kick from A500 has been earlier transferred via transrom.

3) WinUAE 1.1 A500 config followed forementioned hardware setup with OCS chipset setup. F-16CombatPilot ADF loaded and emulation started with floppy emulation at 100% for max. compatibility.

4) Uppon loading of main screen, it seems that emulator is automatically getting left mouse clicks commands making game unplayable. Something like jamming some key like SPACE or RETURN. I tried other ADFs, mostly cracked versions. Same result.Next I played with other Chipset options like Cycle Exact and other but nothing helped until I changed Chipset type to ECS Agnus.


According to this experience, since I have no clue is it a I/O controller emulation issue, OCS in WinUAE is, in fact, a Agnus emulation while ECS Agnus would be FatAgnus/FatterAgnus/SuperAgnus with "old" OCS Denise.

In another words, WinUAE OCS is A1000s and first lot of A2000A's. A500s must use some kind of offered ECS options.

Any comments?


Reference used for HW comparison:
http://obligement.free.fr/articles/chipsetamiga.php

[Toni Wilen]

Uppon loading of main screen, it seems that emulator is automatically getting left mouse clicks commands making game unplayable. Something like jamming some key like SPACE or RETURN

I can't reproduce, mouse works fine in main screen here with or without OCS Agnus. (I used quickstart modes as usual..)

ECS Agnus = 8372A or newer. (supports >0.5M Chip and has new ECS-only custom chipset registers and bits)

OCS Agnus = Agnus model older than 8372A (no ECS supported, and 0.5M chip max)

[Jamos]

Hey Toni,

On this subject what amiga models used the full ECS chipsets(not ocs or ecs agnus)? only the 1200s and later?

[Toni Wilen]

Originally Posted by Jamos

Hey Toni,

On this subject what amiga models used the full ECS chipsets(not ocs or ecs agnus)? only the 1200s and later?

A500+, A600,A3000 ("Full ECS" = both ECS Agnus and Denise installed)

[Jamos]

Thanks sir!