Re: modern Applicard?

[aiiadict@gmail.com]

On Nov 24, 7:40 pm, Steven Hirsch <snhir...@gmail.com> wrote:
> Neither the Applicard nor CardZ180 used DMA for transfer between host and
> guest processor.  They both relied on programmatic transfer.  For example, the
> Z80 writes a byte to a port and polls a status bit to see when it can write
> the next one.  6502 checks a status bit on its side and reads the byte from a
> memory address when it's ready.

Yeah I'm reading more about the cards since this thread was posted...

Even video data is transferred this way....  Did any of the z80 cards
have their own video OUT connector?  Seems like a really slllloooowwww
way to go about updating the screen.