Probably you saw it earlier.
There is a nice FPGA project. Currently only pokey is implemented but also planed are more sound chips implementation:
$D20x: 1 POKEY
$D21x: 2 POKEY
$D22x: 3 POKEY
$D23x: 4 POKEY
$D240..$D25F: 1 SID
$D260..$D27F: 2 SID
$D280..$D283: COVOX
$D284..$D285: 1 PSG
$D286..$D287: 2 PSG
$D288..$D29F: rejestry identyfikujące i konfiguracyjne
$D2A0..$D2BF: PAULA
