23 November 2023, 21:09 | #1 |
Registered User
Join Date: Jan 2023
Location: Italia
Posts: 208
|
Doubt about Chipset type
A500 with 512 slow ram expansion, installed in the hatch.
When I load AmigaTestKit, it reports OCS/PAL. Instead SysTest tells me ECS/PAL. How come? |
23 November 2023, 21:36 | #2 |
This cat is no more
Join Date: Dec 2004
Location: FRANCE
Age: 52
Posts: 8,386
|
OCS / ECS can be differentiated by DENISEID. Garbage on OCS, $F8 on ECS IIRC. So it's easy to check if you have a software monitor or even a small asm program to read 0xDFF07C value. I can't imagine how diag programs can make such a mistake.
http://amiga-dev.wikidot.com/hardware:deniseid |
23 November 2023, 21:50 | #3 |
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 49
Posts: 26,574
|
ECS usually means having ECS Agnus and ECS Denise is separate option (ECS Agnus + OCS Denise is very common combination)
But if it does check ECS Denise, it might not do it right because if you read non-existing register (DENISEID without ECS Denise), you get whatever was in bus in previous access and without doing multiple reads carefully, you can get false positive. |
24 November 2023, 17:29 | #4 |
Registered User
Join Date: Jan 2023
Location: Italia
Posts: 208
|
Sorry, I didn't understand. Maybe it's the translator's fault.
So would I have an OCS or ECS chipset? How can I understand this? |
24 November 2023, 17:45 | #5 |
Senior Member
Join Date: Jun 2001
Location: Germany
Posts: 1,667
|
You have OCS chipset if both Denise and Agnus are OCS.
You have ECS chipset if both Denise and Agnus are ECS. Given the result, you probably have a mix between OCS Agnus with ECS Denise or ECS Agnus with OCS Denise. Best way to tell: open the A500 and look at both chips. |
24 November 2023, 19:07 | #6 |
Going nowhere
Join Date: Oct 2001
Location: United Kingdom
Age: 50
Posts: 9,020
|
Out of interest, what Kickstart is your machine 1.2 or 1.3
And what colour is your power light? |
24 November 2023, 20:55 | #7 |
Registered User
Join Date: Jul 2008
Location: Boston, MA
Posts: 952
|
As Toni said, ECS Agnus with OCS Denise is very common. One program could be checking ECS via the Denise value, another could be checking it via the Agnus value.
Good ol' ShowConfig will tell you specifically whether Agnus and Denise are OCS or ECS, but you'll need Kickstart 2 or above for that. |
25 November 2023, 21:55 | #8 |
Engineer
Join Date: Oct 2018
Location: Shadow realm
Posts: 167
|
Maybe try good old (latest version is not that old actually) sysinfo.
Most likely, you have a rev6 Amiga 500 with ECS Agnus and OCS Denise. |
26 November 2023, 21:32 | #9 |
Registered User
Join Date: Jan 2023
Location: Italia
Posts: 208
|
SysInfo tells me ECS Agnus.
In fact I encountered several defects with some Demos, probably OCS. As is happening with the Demo-Rolling Treasure Trap. Sometimes it loads correctly, and sometimes it doesn't. |
09 December 2023, 19:55 | #10 | |
Registered User
Join Date: Oct 2013
Location: England
Posts: 425
|
Quote:
|
|
09 December 2023, 22:01 | #11 |
Defendit numerus
Join Date: Mar 2017
Location: Crossing the Rubicon
Age: 54
Posts: 4,498
|
I just noticed this thread.
Perhaps it may be of interest:: https://eab.abime.net/showpost.php?p...6&postcount=69 In the vast majority of cases what is of interest is the type of Agnus inside low-end machines, so even that test may be enough (and very simple to use, just insert the disk and immediate result). |
10 December 2023, 16:15 | #12 |
Registered User
Join Date: Sep 2023
Location: Venus
Posts: 188
|
|
10 December 2023, 16:30 | #13 |
Defendit numerus
Join Date: Mar 2017
Location: Crossing the Rubicon
Age: 54
Posts: 4,498
|
|
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
Thread Tools | |
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Total Recall doubt | kremiso | HOL data problems | 3 | 11 December 2022 19:24 |
A520 Color Doubt | spawnerbr | support.Hardware | 7 | 14 July 2016 07:55 |
playermanager with no doubt | turrican3 | Games images which need to be WHDified | 26 | 02 June 2008 23:23 |
Chipset type: OCS / ECS Agnus | Njinsa | support.WinUAE | 4 | 19 December 2005 00:29 |
This will impress Freddy-boy no doubt... | MethodGit | Retrogaming General Discussion | 0 | 24 September 2004 19:50 |
|
|