Hello! I can design some extentions for SAM. Only need some help. At this moment I think of:
4MB memory with long SIMM. (Also 8MB one will work.) ZX128 hardware emulator. Perhaps with Z80 turbo mode. DMA for better speed. ISA Muli I/O card crossing. High density floppy disk access, two serial and one parallel communication ports. Half capacity of harddisk. Interrupts with IM 2 verctors. Video interlacer to double vertical resolution. All as external. Software support guarateed. Anyone interested? -- Yarek.

