exxos's Atari, Amiga & retro forum

I've dusted off a project I built up ages ago to work on the firmware over the last few days. Originally just 8MB fast RAM and an ATA interface I bodged a few tracks and it now supports a mild overclock.

The CPLD is a Lattice ispMACH 4256V. Code in verilog - mine, not a port of any TF code. I enjoy doing the code and debugging (even when I'm tearing my hair out).

The CPU in it is a MC68000P10 - recycled from China & might be a remarked P8 I don't know. It runs at 13.7MHz stably though 8)

Dev board: Obligatory SysInfo shot: edit: the shame... the date stamp on the Gerbers is 17 March 2019 :?

Just trying to work out what you've got there....

A 68010 with 8Mb and IDE, yeah?

Would it not be easier just to buy a TF534 or the upcoming TF536 ??

Normal MC68000P10.

I'm interested in developing hardware so buying something is pointless.

Yeah thats fair enough!

Can you add a 68030 to your board? That would be awesome!

An 030, with fastmem and an IDE port would be just right for an Amiga 500!

Looking good! You must be having fun :)

I would be stoked to ever get that far!

matt020 wrote: 14 May 2020 15:02 Yeah thats fair enough!

Can you add a 68030 to your board? That would be awesome!

An 030, with fastmem and an IDE port would be just right for an Amiga 500!

There are at least 3 boards that are open source that do that. I think he wants to do his thing.

Sometimes it is just about journey, not about destination.

arkadiusz.makarenko wrote: 14 May 2020 18:56 Sometimes it is just about journey, not about destination.

Exactly. :)

terriblefire wrote: 14 May 2020 16:10 There are at least 3 boards that are open source that do that. I think he wants to do his thing.

Ahh I getcha. In that case, nice work! Well done!

Jens has the high features end covered with the ACA500plus & terriblefire has the 680x0 covered so I am looking at something else. This dev board was initially only about fast RAM and IDE. I added some bodge wires to feed the 68K an separate clock. E and /VMA are now in the CPLD so the timers work correctly.

It boots at 16MHz but isn't stable. I don't know yet if that is my dev board, verilog or the 68K. Next is try a MC68HC000 on it. I bought some from 3 separate Chinese vendors... hopefully at least one chip will be genuine.

At the moment it is about understanding the 68K bus and the system. There is a lot of BS out there on the internet about how the Amiga works... source docs are useful but nothing beats an experiment.