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 (00:01:31)
c64 JMP command does 3cy

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.)

Dragonfly (Anders Christiansson)

Rapture

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