On 09/05/2017 06:06 AM, Anders Carlsson wrote: > > .eq P_BB24 = $BB24 > No match, but $BB23 is the entry point to OUTSTR, print string pointed > to by (INDEX1) of length (A). The first instruction of OUTSTR is a TAX. The DB code does LDX for length first before using this routine. I guess it saves them 2 cycles per call. > .eq P_CD0D = $CD0D > No match, but $CD0A is the entry point to MOVMF, store (FAC) into > location pointed to by (X/Y). CD0A calls ROUND first, so CD0D would skip that. > .eq P_D534 = $D534 > Not found > lda #$0d jmp $f266 ;CHROUT > .eq P_E015 = $E015 clears the screen > .eq P_E018 = $E018 > .eq P_E01B = $E01B > Not found Initializes the CRTC, first one with $2ae7 & 0e, the 2nd with $3ce7 & 0c. Probably 40 vs 80 column initialization routines? > .eq P_F143 = $F143 writes .A to the IEEE bus? > .eq P_F1D9 = $F1D9 > Not found This lands at the e8 (inx) of a bit $e840, bmi... in the middle of the unlisten kernal routine. The only jsr to this address is immediately between a jsr CLRCH and jsr NOPEN. This is looking at BASIC 4, but it doesn't make any more sense in the other versions. Message was sent through the cbm-hackers mailing listReceived on 2017-09-05 14:01:09
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