ezrec/amigo

Amigo 1000 - Conversion of the Amiga 1000 schematic into Verilog 2001 RTL

amigo's Issues

is formula for ROM01 correct?

I really appreciate your great work!

There is just one little thing.

from DAUGCAS.v:
initial ROM01 = 1'b0;
always @(*)
ROM01 <= ROME && _A17 && _WPRO && _SROM && _PRW;

This doesn't match Commodore's documentation, they say _A18 instead of _A17:
ROM01 <= ROME && _A18 && _WPRO && _SROM && _PRW;

See the A1000 "source" files from
https://www.amigawiki.org/doku.php?id=de:parts:pld_download

When I get it right this is the switch signal which switches the WOM to read-only, and disables the BOOT-ROM after the WOM has been written. This should be active only for the memory area from 0xf80000 to 0xfbffff, but it must not be active above 0xfc0000 because that area is used to write the to the WOM?

0xf8 = 1111 1000
where the first '0' is /A18 and not /A17.

When you use /A17 instead of /18, the signal would be active for 0xf80000 to 0xf9ffff and from 0xfc0000 to 0xfdffff.

I'm currently working on Kick-Board like the KUPKE / Golem Kickstart ROM Module, see here:
https://www.bigbookofamigahardware.com/bboah/product.aspx?id=1557

Therefore I needed to understand the WOM mechanism (how to disable it) and I try to understand the PAL equations.