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Old 28 February 2016, 18:57   #2
Toni Wilen
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 43
Posts: 20,647
Originally Posted by teppic View Post
I've been having some issues with memory being recognised. I seem to have narrowed it down to a couple of issues. The hardware is set to a standard A1200.

1. With A1200 Kickstart 3.0 (39.106), I can't get any memory recognised when added to the processor slot no matter which settings I choose.

2. With A1200 Kickstart 3.1 (40.68), memory is not recognised with the default 68EC020 configuration. If I disable 24bit addressing, emulating a full 68020, the memory appears fine. (I know that 24bit addressing limits it to 16mb, and I'm trying to add 4-8MB memory, as with real expansions.)
68EC020 is 24-bit so you won't get any RAM outside of first 16M of address space. Perfectly normal.

I'm adding it this way, as the default is to add Zorro II RAM, which didn't exist on an A1200, and is only 16bit, while the processor slot expansions were 32bit fast RAM.
All automatically detected A1200 trapdoor ram-only expansions were Zorro II (with 32-bit data bus). ZII only means autoconfig mode, not width of data bus.

Only accelerator boards can have RAM outside of first 16M because they have full 32-bit addressing capable CPU.
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