;
; Taken from a kernal disassembly done by myself in 2000/2001.
;
-; Ullrich von Bassewitz, 13.09.2001
+; 2001-09-13, Ullrich von Bassewitz
+; 2014-04-02, Greg King
;-----------------------------------------------------------------------------
; Zeropage stuff
-ExecReg = $00
-IndReg = $01
-DEVNUM = $9F
+ExecReg := $00 ; Controls execution memory bank
+IndReg := $01 ; Controls indirect indexed load-store bank
+
+TXTPTR := $85 ; Far pointer into BASIC source code
+FNAM := $90 ; Far pointer to LOAD/SAVE file-name
+FNAM_LEN := $9D ; Holds length of file-name
; ---------------------------------------------------------------------------
; Screen size
;-----------------------------------------------------------------------------
; I/O Definitions
-
-; I/O $d800: VIC
-
-VIC_SPR0_X = $00
-VIC_SPR0_Y = $01
-VIC_SPR1_X = $02
-VIC_SPR1_Y = $03
-VIC_SPR2_X = $04
-VIC_SPR2_Y = $05
-VIC_SPR3_X = $06
-VIC_SPR3_Y = $07
-VIC_SPR4_X = $08
-VIC_SPR4_Y = $09
-VIC_SPR5_X = $0A
-VIC_SPR5_Y = $0B
-VIC_SPR6_X = $0C
-VIC_SPR6_Y = $0D
-VIC_SPR7_X = $0E
-VIC_SPR7_Y = $0F
-VIC_SPR_HI_X = $10
-VIC_SPR_ENA = $15
-VIC_SPR_EXP_Y = $17
-VIC_SPR_EXP_X = $1D
-VIC_SPR_MCOLOR = $1C
+; Note: These numbers aren't addresses. They are offsets from the start of
+; each chip's register set. They are used in the indirect indexed addressing
+; mode.
+
+; I/O $d800: VIC-II
+
+VIC_SPR0_X = $00
+VIC_SPR0_Y = $01
+VIC_SPR1_X = $02
+VIC_SPR1_Y = $03
+VIC_SPR2_X = $04
+VIC_SPR2_Y = $05
+VIC_SPR3_X = $06
+VIC_SPR3_Y = $07
+VIC_SPR4_X = $08
+VIC_SPR4_Y = $09
+VIC_SPR5_X = $0A
+VIC_SPR5_Y = $0B
+VIC_SPR6_X = $0C
+VIC_SPR6_Y = $0D
+VIC_SPR7_X = $0E
+VIC_SPR7_Y = $0F
+VIC_SPR_HI_X = $10
+VIC_SPR_ENA = $15
+VIC_SPR_EXP_Y = $17
+VIC_SPR_EXP_X = $1D
+VIC_SPR_MCOLOR = $1C
VIC_SPR_BG_PRIO = $1B
VIC_SPR_MCOLOR0 = $25
VIC_SPR_MCOLOR1 = $26
-VIC_SPR0_COLOR = $27
-VIC_SPR1_COLOR = $28
-VIC_SPR2_COLOR = $29
-VIC_SPR3_COLOR = $2A
-VIC_SPR4_COLOR = $2B
-VIC_SPR5_COLOR = $2C
-VIC_SPR6_COLOR = $2D
-VIC_SPR7_COLOR = $2E
+VIC_SPR0_COLOR = $27
+VIC_SPR1_COLOR = $28
+VIC_SPR2_COLOR = $29
+VIC_SPR3_COLOR = $2A
+VIC_SPR4_COLOR = $2B
+VIC_SPR5_COLOR = $2C
+VIC_SPR6_COLOR = $2D
+VIC_SPR7_COLOR = $2E
-VIC_CTRL1 = $11
-VIC_CTRL2 = $16
+VIC_CTRL1 = $11
+VIC_CTRL2 = $16
-VIC_HLINE = $12
+VIC_HLINE = $12
-VIC_VIDEO_ADR = $18
+VIC_LPEN_X = $13
+VIC_LPEN_Y = $14
-VIC_IRR = $19 ; Interrupt request register
-VIC_IMR = $1A ; Interrupt mask register
+VIC_VIDEO_ADR = $18
-VIC_BORDERCOLOR = $20
-VIC_BG_COLOR0 = $21
-VIC_BG_COLOR1 = $22
-VIC_BG_COLOR2 = $23
-VIC_BG_COLOR3 = $24
+VIC_IRR = $19 ; Interrupt request register
+VIC_IMR = $1A ; Interrupt mask register
+VIC_BORDERCOLOR = $20
+VIC_BG_COLOR0 = $21
+VIC_BG_COLOR1 = $22
+VIC_BG_COLOR2 = $23
+VIC_BG_COLOR3 = $24
; I/O $da00: SID 6581
-SID_S1Lo = $00
-SID_S1Hi = $01
-SID_PB1Lo = $02
-SID_PB1Hi = $03
-SID_Ctl1 = $04
-SID_AD1 = $05
-SID_SUR1 = $06
-
-SID_S2Lo = $07
-SID_S2Hi = $08
-SID_PB2Lo = $09
-SID_PB2Hi = $0A
-SID_Ctl2 = $0B
-SID_AD2 = $0C
-SID_SUR2 = $0D
-
-SID_S3Lo = $0E
-SID_S3Hi = $0F
-SID_PB3Lo = $10
-SID_PB3Hi = $11
-SID_Ctl3 = $12
-SID_AD3 = $13
-SID_SUR3 = $14
-
-SID_FltLo = $15
-SID_FltHi = $16
-SID_FltCtl = $17
-SID_Amp = $18
-SID_ADConv1 = $19
-SID_ADConv2 = $1A
-SID_Noise = $1B
-SID_Read3 = $1C
-
-
-; I/O $db00: CIA 6526 Inter Process Communication
+SID_S1Lo = $00
+SID_S1Hi = $01
+SID_PB1Lo = $02
+SID_PB1Hi = $03
+SID_Ctl1 = $04
+SID_AD1 = $05
+SID_SUR1 = $06
+
+SID_S2Lo = $07
+SID_S2Hi = $08
+SID_PB2Lo = $09
+SID_PB2Hi = $0A
+SID_Ctl2 = $0B
+SID_AD2 = $0C
+SID_SUR2 = $0D
+
+SID_S3Lo = $0E
+SID_S3Hi = $0F
+SID_PB3Lo = $10
+SID_PB3Hi = $11
+SID_Ctl3 = $12
+SID_AD3 = $13
+SID_SUR3 = $14
+
+SID_FltLo = $15
+SID_FltHi = $16
+SID_FltCtl = $17
+SID_Amp = $18
+SID_ADConv1 = $19
+SID_ADConv2 = $1A
+SID_Noise = $1B
+SID_Read3 = $1C
+
+
+; I/O $db00: CIA 6526, Inter Process Communication
; I/O $dc00: CIA 6526
.struct CIA
.endstruct
-; Out video memory address
+;-----------------------------------------------------------------------------
+; Our video memory address
+
+COLOR_RAM := $D400 ; System bank
-COLOR_RAM = $D400 ; System bank
+;-----------------------------------------------------------------------------
+
+BASIC_BUF := $FB5E ; Bank 0 location of command-line
+BASIC_BUF_LEN = 162 ; Maximum length of command-line
projects / cc65 / blobdiff