mirrorbird(00:04:21)
oh yeah it must be +128/-127 actually. must be a byte. i bet i remembered it wrong
Agemixer(00:03:55)
Yes, JMP $xxxx can access to 64 kilobytes anywhere, branch (relative) commands B** can branch from -128 to +127 bytes "from here"
mirrorbird(00:03:48)
fact of the day: Neal Stephenson's "Snow Crash" was about his spectrum resetting into the wrong mode and having ULA snow on screen.
mirrorbird(00:02:32)
i guess that's all there *is* to know. until you are a cycle-counting nerd like my Galaxians friend
mirrorbird(00:02:08)
all i know about z80 jumps is: JR (relative) can go plus or minus 256, and JP can go anywhere. similar on 6510?
Agemixer(00:00:56)
and 6510 CPU and VIC chip use different halves of a clock cycle so they doesnt interfere on address/data buses
mirrorbird(00:00:37)
like mosquitoes over the lake. scots and finns will know.
mirrorbird(00:00:14)
interesting, that snow effect, it only happens around 'set' bits in the bitmap, so it's like tiny flies hovering around the actual pixels on the screen. empty parts are clear.
Agemixer(23:59:25)
c64 6510 (6502) does 6 cycles on JSR (jump subroutine) and 6cy on RTS (Return from subr.)