Looking for a case for my Altera-DE1 based Amiga

[RedskullDC]

Hi ChaosLord et al.

@bbond007  The Altera DE1 is limited to 4096 colors like an A500.  So AGA would be sort of useless on it.

Limited to 4096 colours...

Unless you wire up an alternate VGA interface with a larger resistor network to one of the GPIO connectors. Easy enough to do.

Example:
I use one of these:
http://www.nkcelectronics.com/vga-breakout-board-with-db15-female-connector-and-pin-head15.html
wired up to a Spartan3 board (which only has one bit per colour) to get 4bits per colour.

Cheers,
Red

[RedskullDC]

Hi ChaosLord,

@RedSkullDC
Your link says:
12-bit = 4096 colors

AGA requires 16777216 colors

Was just an *example* to show that FPGA boards can easily be expanded for more bits per colour.

You've no doubt noticed on the page for the adapter that it has 5 jumpers (SJ1-SJ5) to allow it to act as a simple 16pin header to DB-15 breakout.
One would need an intermediate board, with a suitable resistor network, between a DE1 GPIO connector and this adapter to display AGA modes.

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Commodore-One, for *EXAMPLE*, has a 16-bit (5-6-5) VGA interface:
http://c64upgra.de/c-one/tech/C-One_instant_on_schematics.pdf
(Page6 is the VIDEO circuit)

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My point is that the DE1 can easily be modified to copy with the required bits/colour to faithfully display AGA screen modes.

Cheers,
Red