From: Grósz Attila (gyros_at_freemail.hu)
Date: 2007-04-04 12:39:10
Hi, William Levak <email@example.com> írta: > ted-lo looks like $8000-BFFF > ted-hilo looks like $C000-DFFF > ted-hihi looks like $E000-FFFF > > $390-770 in ted-lo looks like it should be the command list, but it is > obviously garbled. It looks very odd indeed. I made a quick disassembly and it is not total garbage though. It has code fragments that look like actual TED register manipulations which is odd considering that this area is supposed to be the BASIC ROM. Look at this: . 81d0 ad 1c ff LDA $ff1c . 81d3 29 0f AND #$0f . 81d5 09 08 ORA #$08 . 81d7 8d 1c ff STA $ff1c . 81da ad 1d ff LDA $ff1d . 81dd c9 9b CMP #$9b This is the vertical line count register (which is writable for the TED machines). Weird thing is that this feature wasn't even used in production ROMs only in a few games and demos much later. If I just take the 16kb HI ROM, and booted: it sets NTSC mode and sort of freezes. (tried it in Yape) I must admit it looks very different from the final kernal ROM, with I/O data addresses $FE00-$FE1F that are unmapped in the production machines. I'll look further. Very interesting! Attila ______________________________________________________________ Kiadós akció az Alexandra Online-nál kedden és szerdán! 40% engedménnyel vásárolhatja meg az Alexandra Kiadó könyveit! http://ad.adverticum.net/b/cl,1,6022,154194,219404/click.prm Message was sent through the cbm-hackers mailing list
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