English Amiga Board - View Single Post - Differences between the original A2000 and later B2000

mark_k · 11 December 2012, 13:51

That's a good question. According to the TMS4257 datasheet (the chip in the board picture at amiga-hardware.com) it's a dynamic RAM. There are three PALs on the board but they probably don't constitute a DRAM refresh controller.

The A500/A2000 Technical Reference Manual (PDF version available online) has an A2000 board schematic. The CPU slot connector is shown on page 263 of the PDF. Someone who knows about DRAM refresh could probably figure it out from that and the other pages of the schematic.

11 December 2012, 13:51	#3
mark_k Registered User Join Date: Aug 2004 Location: Posts: 3,346	That's a good question. According to the TMS4257 datasheet (the chip in the board picture at amiga-hardware.com) it's a dynamic RAM. There are three PALs on the board but they probably don't constitute a DRAM refresh controller. The A500/A2000 Technical Reference Manual (PDF version available online) has an A2000 board schematic. The CPU slot connector is shown on page 263 of the PDF. Someone who knows about DRAM refresh could probably figure it out from that and the other pages of the schematic.