Yes, I have more informanions about ASIC function and timing. ASIC chip is very similar as ZX ULA, use only different XTAL, border size and support hi-res mode (12 MHz pixels). ZX screen mode, hw multicolor,hi-res and color pixel mode 4 is very easy to implement. All other features is only memory paging, color palette, programmable interrupt. Keyboard membrane use same matrix as zx spectrum 48, only numeric keyboard and function keys is add to next port. CPU is slow-down via WAIT only. My clone will contain one CPLD XC95288XL(ula/asic) + sram memory(colour palette) + next small cpld for I/O operations,memory controll etc..Сообщение от bigral
Glad to hear that, but do you know anything about this Sam ASIC internals? Have you contacted copyright holder with offer to open source technical docs about Sam H/W? As soon as you'll get enough technical details just post them here on this forum and I'm sure after short time we'll see first Sam version for Altera DE1 dev board...
I use ABEL only for programming CPLD.
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