Agemixer (00:20:05)
PHA to push accu, PLA to pull (for stack) but it is not all efficient by cycles, but makes program smaller instead, up to 66% smaller for these commands

Agemixer (00:17:56)
program counter = internal register. very rarely required to mangle with - JSR command stores it, then you can read it from stack (which can be used additional 256 registers too)

mirrorbird (00:17:55)
http://z80-heaven.wikidot.com

mirrorbird (00:17:25)
haha. would probably not be so hard today. but i'm a spoiled HLL child

mirrorbird (00:17:00)
i remember in my teens picking up some book that tried to describe the registers as fingers, but you could also put on gloves (EXX exchange instruction), confused the hell out of me immediately

Agemixer (00:16:26)
yeah A=accu reg, X= X index reg, Y = Y index reg. But it has never restricted you know, you can use "zeropage" kinda added register, not 16bit addressing but 8bit (which does 1 cycle faster)

mirrorbird (00:16:24)

mirrorbird (00:16:10)
is the program counter a register? guess so

mirrorbird (00:15:37)
("Nah RET is basically POP PC so no jump there. Which is why it is same speed as a POP instruction")

Agemixer (00:13:45)
BCC for "<" test, BCS for ">=" test, BEQ for "==" test, BNE for "!="

Summer Night

MmcM (Sergey Kosov)

mirrorbird

Time Left: 3:03