Fat and Fatter Agnus

[fillosauru]

Hey, which one of the Fat Agnuses is in the OCS and which in the ECS?
8372A or 8375?
 :-?

[AdMartin]

Both are ECS.

[AdMartin]

The 8372A and 8375A support 1MB chipmem, whereas the 8372B and 8375B support 2MB chipmem, those are the differences.

OCS A2000s & A500s had 8370 (NTSC) or 8371 (PAL). I once had an old A2000 rev 4 (often called rev 3.9 or model A) with an 8367 Agnus, IIRC. It was a PAL A2000. Maybe that's the one PAL A1000s also used, I don't know.

[bigdan]

8372A : OCS i presume (A500-A2000)

8375 : ECS

Check the partnumber on Agnus page on BBoAH

[fillosauru]

Thx. That means I only have to get a Super Denise to make my rev6 A500 ECS

[Bandaid]

8370 NTSC OCS Fat Agnus (512K max) On A500 Rev 4, 5
8371 PAL OCS Fat Agnus (512K max) On A500 Rev 4, 5
8372A NTSC/PAL ECS Fat Agnus (1MB max) On A500 Rev 6A
8372B NTSC/PAL ECS Fat Agnus (2MB max) On A3000

8375B - NTSC/PAL ECS 2MB Agnus for (A500 Rev 7?) and 2MB Chip gizmos like MegaChip 2000.

Proper (artifact free) use of the 8373 ECS Denise requires at least an 8372A Agnus (i.e., ECS Agnus).

[Argus]

The 8375B Super Fat Agnus was used in the A3000T-040 and in the Rev 8A A500+ motherboard (info from an old Paxtron Corporation advertisement).  It is pin compatible with the 8372B found in most A3000s and early A3000Ts.

[fillosauru]

  ||Proper (artifact free) use of the 8373 ECS Denise requires at least an 8372A Agnus (i.e., ECS Agnus).||

My A500 is rev6, with 8372A; that's why I said that with a ECS Denise I'll have a full ECS