ab0tj's latest activity

Yeah, it's definitely a hassle that you have to multiplex both the address and the data lines of the mapping RAM depending on if it's...

Agreed, that would be a great way to go about it. The problem I ran into when exploring SRAM-based options is the control logic that...

I've been kicking around a design using a SRAM chip as a pager; there are pretty cheap 64kx16 bit SRAMs with sub-20ns access times. That...

Correct. The CPLD I'm using at the heart of it can barely handle that as it is... I may look into EMS4.0 support in a later version of...

I guess in my mind it is a verb here, "backfill enable" meaning to enable the board to backfill memory in those areas. But I'll keep...

The backfill switches add system memory independently of the EMS page frame. It's not likely the "0-128k" setting will ever be used, but...

That's the term used by most expansion memory boards, at least that I'm familiar with. See the manual for the AST RamPage Plus 286, for...

Hi all, Just wanted to share what I've been working on lately. This is a 16 bit ISA expansion card that provides 8MB of system RAM and...