On 10/31/2017 12:43 PM, Ruud@Baltissen.org wrote: > http://www.baltissen.org/temp/DB-hires.zip > I already mentioned the triple question marks. But you will also see > some quite large areas W/O comment. Mostly these are areas with a > lot of juggling with unknown variables, so much that I took it for > granted (read: sorry, I'm lazy). So if somebody has a lot of spare > time, please be my guest and find out what is happening. > Just a few ???-clarifications from a quick scan: D_A2E9 are 16 screen codes representing 4-bit pixel coverage using block characters. Offset 1 = upper left, 2 = lower left, 4 = upper right, 8 = lower right. The cpx #$80 in GetCheckParams copies the high bit of .X into the carry flag. It's not missing a branch. This use of CMP is common in things like sign extension. Message was sent through the cbm-hackers mailing listReceived on 2017-10-31 20:01:54
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