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Add full name of SF web page

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2012-07-30 18:15:40 +00:00
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build/AppleCommander-boot.s
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********************************************************** * * * APPLECOMMANDER boot code. * * Copyright (c) 2002, Rob Greene * * * * This code is published under the GPL license. See the * * AppleCommander site for license information. * * * ********************************************************** ORG $800 * * Zero page variables. Used by Apple ][ ROM routines * as well as this code. * XEND = $2C ADDR = $26 * * Keyboard switches * KEYBOARD = $C000 KEYCLEAR = $C010 * * Disk ][ interface locations * MOTOROFF = $C088 * * General Apple ][ ROM locations * TEXT = $FB2F HOME = $FC58 GR = $FB40 COLOR = $F864 HLIN = $F819 PRINT = $FDF0 REBOOT = $FAA6 CALCADDR = $F847 DELAY = $FCA8 * * Image offset locations (from upper-left). * Note that, due to space, the XOFFSET isn't * currently used - but, because of the rotating * image, it doesn't really matter! * XOFFSET = 14 YOFFSET = 13 * * The boot rom (probably $C600) uses the first byte * to indicate the number of sectors to load. Normally * this is just one sector, so this program is constrained * to 256 bytes - just in case of compatibility problems. * DFB 1 * * General setup. * LDA MOTOROFF,X JSR TEXT JSR HOME JSR GR * * Draw the AppleCommander logo (well, sorta). * DATA1 and DATA2 contain 4 values - the color value, * the xstart (start of line), xend (end of line), as * well as the Y position. * LDX #DATA2-DATA1 :LOGO LDA DATA1-1,X LSR LSR LSR LSR JSR COLOR LDA DATA2-1,X LSR LSR LSR LSR STA XEND LDA DATA1-1,X AND #$F TAY LDA DATA2-1,X AND #$F CLC ADC #YOFFSET JSR HLIN DEX BNE :LOGO * * Display AppleCommander message. * :TEXT LDA MESSAGE,X BEQ :WAIT JSR PRINT INX BNE :TEXT * * Check for a keypress * :WAIT LDA KEYBOARD BPL :SETUP STA KEYCLEAR JMP REBOOT * * Rotate the screen (isn't that retro)! * :SETUP LDX #19 :ROTATE TXA JSR CALCADDR LDY #0 LDA (ADDR),Y PHA :SHIFT INY LDA (ADDR),Y DEY STA (ADDR),Y INY CPY #39 BNE :SHIFT PLA STA (ADDR),Y DEX BPL :ROTATE * * Introduce a pause between rotations. * :KEYLOOP LDA #$08 JSR DELAY DEX BNE :KEYLOOP BEQ :WAIT * * The image data codes the upper nybble with one * value and the lower nybble with the second value * in an effort to conserve space. Thus, 17 HLINs * are stored in 34 bytes instead of 68. * * DATA1 consists of color and x1 (start) position. * DATA1 HEX C8C7C6C3C8C2 ; green HEX D1D1 ; yellow HEX 9090 ; orange HEX 1010 ; red HEX 3131 ; purple HEX 626368 ; blue * * DATA2 consists of x2 (end) and y position. * DATA2 HEX 90817253B3C4 HEX D5D6 HEX C7B8 HEX B9CA HEX DBDC HEX CD5EBE * * Text message to display at bottom of screen. * MESSAGE ASC "THIS DISK CREATED WITH APPLECOMMANDER"8D ASC "VISIT APPLECOMMANDER.SF.NET"8D ASC " "8D ASC "INSERT ANOTHER DISK AND PRESS ANY KEY"00
********************************************************** * * * APPLECOMMANDER boot code. * * Copyright (c) 2002, Rob Greene * * * * This code is published under the GPL license. See the * * AppleCommander site for license information. * * * ********************************************************** ORG $800 * * Zero page variables. Used by Apple ][ ROM routines * as well as this code. * XEND = $2C ADDR = $26 * * Keyboard switches * KEYBOARD = $C000 KEYCLEAR = $C010 * * Disk ][ interface locations * MOTOROFF = $C088 * * General Apple ][ ROM locations * TEXT = $FB2F HOME = $FC58 GR = $FB40 COLOR = $F864 HLIN = $F819 PRINT = $FDF0 REBOOT = $FAA6 CALCADDR = $F847 DELAY = $FCA8 * * Image offset locations (from upper-left). * Note that, due to space, the XOFFSET isn't * currently used - but, because of the rotating * image, it doesn't really matter! * XOFFSET = 14 YOFFSET = 13 * * The boot rom (probably $C600) uses the first byte * to indicate the number of sectors to load. Normally * this is just one sector, so this program is constrained * to 256 bytes - just in case of compatibility problems. * DFB 1 * * General setup. * LDA MOTOROFF,X JSR TEXT JSR HOME JSR GR * * Draw the AppleCommander logo (well, sorta). * DATA1 and DATA2 contain 4 values - the color value, * the xstart (start of line), xend (end of line), as * well as the Y position. * LDX #DATA2-DATA1 :LOGO LDA DATA1-1,X LSR LSR LSR LSR JSR COLOR LDA DATA2-1,X LSR LSR LSR LSR STA XEND LDA DATA1-1,X AND #$F TAY LDA DATA2-1,X AND #$F CLC ADC #YOFFSET JSR HLIN DEX BNE :LOGO * * Display AppleCommander message. * :TEXT LDA MESSAGE,X BEQ :WAIT JSR PRINT INX BNE :TEXT * * Check for a keypress * :WAIT LDA KEYBOARD BPL :SETUP STA KEYCLEAR JMP REBOOT * * Rotate the screen (isn't that retro)! * :SETUP LDX #19 :ROTATE TXA JSR CALCADDR LDY #0 LDA (ADDR),Y PHA :SHIFT INY LDA (ADDR),Y DEY STA (ADDR),Y INY CPY #39 BNE :SHIFT PLA STA (ADDR),Y DEX BPL :ROTATE * * Introduce a pause between rotations. * :KEYLOOP LDA #$08 JSR DELAY DEX BNE :KEYLOOP BEQ :WAIT * * The image data codes the upper nybble with one * value and the lower nybble with the second value * in an effort to conserve space. Thus, 17 HLINs * are stored in 34 bytes instead of 68. * * DATA1 consists of color and x1 (start) position. * DATA1 HEX C8C7C6C3C8C2 ; green HEX D1D1 ; yellow HEX 9090 ; orange HEX 1010 ; red HEX 3131 ; purple HEX 626368 ; blue * * DATA2 consists of x2 (end) and y position. * DATA2 HEX 90817253B3C4 HEX D5D6 HEX C7B8 HEX B9CA HEX DBDC HEX CD5EBE * * Text message to display at bottom of screen. * MESSAGE ASC "THIS DISK CREATED WITH APPLECOMMANDER"8D ASC "VISIT APPLECOMMANDER.SOURCEFORGE.NET"8D ASC " "8D ASC "INSERT ANOTHER DISK AND PRESS ANY KEY"00