mirror of
https://github.com/erkyrath/infocom-zcode-terps.git
synced 2026-02-28 17:19:27 +00:00
56 lines
1.2 KiB
NASM
56 lines
1.2 KiB
NASM
PAGE
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STTL "--- MACHINE COLDSTART: APPLE II ---"
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; ---------
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; COLDSTART
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; ---------
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SIG: DB 0 ; IIc FLAG
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STRYSL: DB 0 ; BOOT SLOT
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STRYDR: DB 0 ; BOOT DRIVE
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; FINISH LOADING THE ZIP
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COLD:
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LDA BSLOT ; SET UP
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STA DCBSLT ; CURRENT AND
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STA DCBPSL ; PREVIOUS SLOT IDS
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LDA #>MCOUT1 ; SET SCREEN OUTPUT (X)
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STA CSW+HI ; IN CASE OF PR#6
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LDA #<MCOUT1 ; WHICH SETS ALL IN & OUTPUT (X)
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STA CSW+LO ; TO PR #6
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LDX #0
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STX DCBSEC ; START WITH SECTOR 0
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STX DBUFF+LO ; CLEAR LSB OF [DBUFF]
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INX ; = 1
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STX DCBTRK ; START WITH TRACK 1
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STX DCBDRV ; SET UP CURRENT
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STX DCBPDR ; AND PREVIOUS DRIVE ID
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LDA #$DE ; START LOAD AT $DE00 (X)
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STA DBUFF+HI
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LDA #34 ; LOAD ALL OF (X)
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STA I+LO ; TRACK 1 AND PART OF 2 (EZIP)
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COLD0: JSR GETRES ; GO THRU ZDOS
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DEC I+LO ; DONE LOADING?
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BNE COLD0 ; NO, SO LOOP BACK
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LDA #$FF ; SET TO NORMAL DISPLAY
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STA INVFLG
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; DETERMINE SCREEN CONFIGURATION
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JSR CHKSIZ ; DOWN ON PG 9 AS MUST CHECK BYTES IN ROM
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BCC COLD1
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BCS NORAM ; OOPS
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COLD1: LDA SIG
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BEQ DO80 ; IIC, SKIP CHECK
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JSR MEMCHK ; CHECK IF 128K OF MEMORY
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BCS NORAM ; NOPE
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DO80: JSR CALL80 ; INIT 80 COL (PR#3) FROM PAGE 9 (X)
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END
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