Z80 Computer - Part 4 I/O Address Decoding

[@jamesross3939]

Nice! Easy to understand explanations!

[@kdmq]

The background noise at 9:45 had me looking all around my chair for a rodent lol.

[@SteveRaynerMakes]

That's probably my tortoise

[@PE4Doers]

Steve, I added a 'Like'' here 🙂

[@pproietti67]

Hi, I think that the 'error' is in the instruction "ld b,(hl) that means "load register b with the content of memory location pointed by 'hl'and as you haven't memory this number is random :D

[@SteveRaynerMakes]

Hi. I'm not sure what error you are referring to as the program behaves as expected. You are correct ld b, (hl) means load register b with the contents of the memory address pointed to by hl. hl is set on the line above to memory address zero. We do have memory at that location because that is where our program is located. Sorry if I've misunderstood what you are saying.

[@JarppaGuru]

it start read from memory address 0000 that will be rom. no error

[@alfredomeurerjunior9547]

Mr Steve, could you please to show the program that you used for this nice one board Z80 computer? Will be very good we have it, if you have more programs for this kit, please show them. Thank you so much for your kind help.

[@Lucretia9000]

I would've done it in reverse and set the address first and then the data byte.