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Clean up some details in cold start initialization
| author | William Astle <lost@l-w.ca> |
|---|---|
| date | Sat, 13 Jul 2024 12:56:05 -0600 |
| parents | 917b4893bb3d |
| children |
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*pragmapush list *pragma list ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; Various constants console_curdel equ 10 ; delay between cursor blink cycles keyb_bufflen equ 64 ; keyboard ring buffer length keyb_repdeli equ 40 ; ticks before initial repeat (2/3 s) keyb_repdelr equ 6 ; 10 repeats per second keyb_caps equ 0x80 ; capslock enabled keyb_alt equ 0x04 ; alt pressed keyb_ctrl equ 0x02 ; ctrl pressed keyb_shift equ 0x01 ; shift pressed linebuffsize equ 0x100 ; the line input buffer (256 bytes) stringstacknum equ 20 ; number of entries on the anonymous string descriptor stack stackheadroom equ 50 ; required headroom for the stack on OM checks stringspacedef equ 200 ; default string space allocation ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; Program storage structure ; ; The program itself consists of two sets of data. The first is a table of line numbers. Each consists of a 16 bit ; pointer to the line data and a 16 bit unsigned line number. These entries are stored in line number order. The line ; data is also stored in line number order. The length of each line is the difference between the current line pointer ; and the next line pointer. There is a final dummy line number entry after the last program line which holds the ; pointer to the first free byte after the program. This is stored there to allow for simpler code for calculating line ; lengths. ; ; Note: linetab_stride + linetabent_size must be a power of two *less than* 256 linetabent_ptr equ 0 ; offset of the pointer to the line data (must be first) linetabent_num equ 2 ; offset to line number linetabent_size equ 4 ; size of a line number table entry, must be power of two linetab_stride equ 16 ; expand the line table in blocks of 16 entries, must be power of two ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; Data structure used for calculations. Calculations are handled via structures called value accumulators. A value ; accumulator consists of a data type flag (at the end of the structure) and a data area whose layout varies based ; on the actual data type. The layouts for each value type are described below. ; ; A value type that is NULL (not set to anything) has type 0 (valtype_none) and the rest should be zero. ; ; A value accumulator has the following structure for floating point, which holds a packed floating point value: ; Offset Length Contents ; 0 1 fp exponent and sign ; 1 5 fp mantissa ; 6 1 value type ; ; A value accumulator has the following structure for integers: ; Offset Length Contents ; 0 4 integer value (two's complement) ; 4 2 *unused* ; 6 1 value type ; ; A value accumulator has the following structure for a string: ; Offset Length Contents ; 0 2 string length ; 2 2 *reserved for string data pointer expansion, must be zero* ; 4 2 string data pointer ; 6 1 value type ; ; Value type constants valtype_none equ 0 ; unknown value type valtype_int equ 1 ; integer (32 bit) value (signed) valtype_float equ 2 ; BCD float type (48 bit) value valtype_string equ 3 ; string type (16 bit length, 16(32) bit data pointer ; Floating point accumulator structure definitions ; ; Note: the extra precision bytes are needed for general calculations and need to be at least the same ; size as the significand itself; the exponent will be stored with the bias. The accumulators are ; unpacked. fpa.exp equ 0 ; exponent - use largest size needed for any precision fpa.sig equ fpa.exp+1 ; significand - use largest size needed for any precision fpa.extra equ fpa.sig+5 ; extras; largest size needed for any precision, must follow significand fpa.sign equ fpa.extra+5 ; sign flag fpa.size equ fpa.sign+1 ; use the largest floating point accumulator size ; String data definition str.len equ 0 ; string length (2 bytes) str.ptr equ str.len+2 ; string data pointer (3 bytes) str.size equ str.ptr+3 ; Value accumulator structure definitions; note that the actual value data must be first and any ; incidental meta data must follow val.value equ 0 ; offset of the value stored in the accumulator val.fpsexp equ val.value ; floating point exponent (and sign) val.fpssig equ val.fpsexp+1 ; floating point significand val.int equ val.value ; integer offset val.strlen equ val.value+str.len ; string length offset val.strptr equ val.value+str.ptr ; string data pointer (low word) val.type equ 6 ; use the largest of the data type sizes here val.size equ val.type+1 ; size of a value accumulator ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ifdef COCO3 ; GIME INIT0 GIME_COCO equ 0x80 ; Set for coco2 compatible mode (video display) GIME_MMUEN equ 0x40 ; Set to enable MMU GIME_IEN equ 0x20 ; GIME IRQ enable GIME_FEN equ 0x10 ; GIME FIRQ enable GIME_FExx equ 0x08 ; Enable constant RAM at 0xFExx (comes from block 0x3f) GIME_SCS equ 0x04 ; Set to enable standard SCS (switches 0xFF5x) GIME_ROME16 equ 0x00 ; 16K internal, 16K external ROM mode GIME_ROME32 equ 0x03 ; 32K external ROM GIME_ROMI32 equ 0x02 ; 32K internal ROM ; GIME INIT1 GIME_TMRFAT equ 0x20 ; TIMER ticks approx every 279.365 ns GIME_TMRSLOW equ 0x00 ; TIMER ticks approx every 63.695 µs GIME_TASK0 equ 0x00 ; MMU task 0 GIME_TASK1 equ 0x01 ; MMU task 1 ; GIME interrupt enable/status bits GIME_ITIMER equ 0x20 ; TIMER interrupt (timer reaches 0) GIME_IHBORD equ 0x10 ; HSYNC interrupt (falling edge) GIME_IVBORD equ 0x08 ; VSYNC interrupt (falling edge) GIME_ISERIAL equ 0x04 ; Falling edge of signal on pin 4 of serial port GIME_IKEYBOARD equ 0x02 ; Interrupt if a 0 bit appears on bits 6-0 of PIA0.DA GIME_ICART equ 0x01 ; Interrupt on falling edge of pin 8 of cartridge port ; GIME VMODE GIME_BP equ 0x80 ; enable bit plane mode GIME_BPI equ 0x20 ; colour burst phase inversion (composite output only) GIME_MONO equ 0x10 ; disable colour burst (composite output only) GIME_H50 equ 0x08 ; set to 50Hz operation GIME_LPR1 equ 0x00 ; one line per row GIME_LPR2 equ 0x02 ; two lines per row (also works on graphics) GIME_LPR8 equ 0x03 ; 8 lines per row GIME_LPR9 equ 0x04 ; 9 lines per row GIME_LPR10 equ 0x05 ; 10 lines per row GIME_LPR11 equ 0x06 ; 11 lines per row GIME_LPRINF equ 0x07 ; "infinite" lines per row ; GIME VRES GIME_LPF192 equ 0x00 ; 192 lines on screen GIME_LPF200 equ 0x40 ; 200 lines on screen (actually 199 due to hardware bug) GIME_LPF225 equ 0x60 ; 225 lines on screen GIME_BPR16 equ 0x00 ; 16 bytes per row GIME_BPR20 equ 0x04 ; 20 bytes per row GIME_BPR32 equ 0x08 ; 32 bytes per row GIME_BPR40 equ 0x0c ; 40 bytes per row GIME_BPR64 equ 0x10 ; 64 bytes per row GIME_BPR80 equ 0x14 ; 80 bytes per row GIME_BPR128 equ 0x18 ; 128 bytes per row GIME_BPR160 equ 0x1c ; 160 bytes per row GIME_TXT32 equ 0x00 ; 32 characters per row GIME_TXT40 equ 0x04 ; 40 characters per row GIME_TXT64 equ 0x10 ; 64 characters per row GIME_TXT80 equ 0x14 ; 80 characters per row GIME_BPP1 equ 0x00 ; 1 bit per pixel GIME_BPP2 equ 0x01 ; 2 bits per pixel GIME_BPP4 equ 0x02 ; 4 bits per pixel GIME_TXTATTR equ 0x01 ; text attributes enabled endc ifdef COCO3 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; Stuff on the fixed memory page org 0xfe00 rmb 0xed ; unused INT.FLAG rmb 1 ; validity flag INT.SWI3 rmb 3 ; SWI3 bounce vector INT.SWI2 rmb 3 ; SWI2 bounce vector INT.FIRQ rmb 3 ; FIRQ bounce vector INT.IRQ rmb 3 ; IRQ bounce vector INT.SWI rmb 3 ; SWI bounce vector INT.NMI rmb 3 ; NMI bounce vector endc ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; Hardware definitions for the I/O page org 0xff00 PIA0 equ * ; Keyboard PIA PIA0.DA rmb 1 ; PIA0 data/direction A PIA0.CA rmb 1 ; PIA0 control A PIA0.DB rmb 1 ; PIA0 data/direction B PIA0.CB rmb 1 ; PIA0 control B rmb 28 ; mirror images of PIA0 PIA1 equ * ; DA/misc stuff PIA1.DA rmb 1 ; PIA1 data/direction A PIA1.CA rmb 1 ; PIA1 control A PIA1.DB rmb 1 ; PIA1 data/direction B PIA1.CB rmb 1 ; PIA1 control B rmb 28 ; mirror images of PIA1 rmb 16 ; SCS/Disk controller rmb 16 ; second half of SCS area rmb 32 ; miscelaneous hardware ifdef COCO3 rmb 16 ; *reserved* (unused but the GIME drives them) GIME.INIT0 rmb 1 ; basic GIME system config GIME.INIT1 rmb 1 ; MMU task and timer rate GIME.IRQ rmb 1 ; GIME IRQ enable/status register GIME.FIRQ rmb 1 ; GIME FIRQ enable/status register GIME.TIMER rmb 2 ; GIME programmable timer rmb 2 ; *reserved* GIME.VMODE rmb 1 ; GIME video mode setting GIME.VRES rmb 1 ; GIME video resolution setting rmb 1 ; *reserved* (used for MMU expansion on some memory boards) GIME.BORDER rmb 1 ; GIME border colour GIME.VSCROLL rmb 1 ; vertical scroll offset register/VDG screen mode variation GIME.VOFFSET rmb 2 ; address of video memory (8 byte increments) GIME.HOFFSET rmb 1 ; horizontal scroll offset GIME.MMU equ * ; MMU registers (two tasks) GIME.MMU0 rmb 8 ; MMU task 0 GIME.MMU1 rmb 8 ; MMU task 1 GIME.PALETTE rmb 16 ; Palette registers else rmb 64 ; unused on Coco 1/2 (GIME on Coco 3) endc SAMREG equ * ; the SAM configuration register SAM.V0CLR rmb 1 ; SAM video mode bits SAM.V0SET rmb 1 SAM.V1CLR rmb 1 SAM.V1SET rmb 1 SAM.V2CLR rmb 1 SAM.V2SET rmb 1 SAM.F0CLR rmb 1 ; SAM screen address bits SAM.F0SET rmb 1 SAM.F1CLR rmb 1 SAM.F1SET rmb 1 SAM.F2CLR rmb 1 SAM.F2SET rmb 1 SAM.F3CLR rmb 1 SAM.F3SET rmb 1 SAM.F4CLR rmb 1 SAM.F4SET rmb 1 SAM.F5CLR rmb 1 SAM.F5SET rmb 1 SAM.F6CLR rmb 1 SAM.F6SET rmb 1 SAM.P1CLR rmb 1 ; SAM "page 1" selection (or extra memory type flag) SAM.P1SET rmb 1 SAM.R0CLR rmb 1 ; SAM R0 bit (address dependent speedup, not used on Coco3) SAM.R0SET rmb 1 SAM.R1CLR rmb 1 ; SAM R1 bit (full speedup/coco 3 speedup) SAM.R1SET rmb 1 SAM.M0CLR rmb 1 ; SAM M0/M1 bits (memory type, not used on Coco3) SAM.M0SET rmb 1 SAM.M1CLR rmb 1 SAM.M1SET rmb 1 SAM.TYCLR rmb 1 ; force ROM mode (map type 0) SAM.TYSET rmb 1 ; set RAM mode (map type 1) rmb 18 ; *MPU reserved* CPU.SWI3 rmb 2 ; CPU SWI3 vector CPU.SWI2 rmb 2 ; CPU SWI2 vector CPU.FIRQ rmb 2 ; CPU FIRQ vector CPU.IRQ rmb 2 ; CPU IRQ vector CPU.SWI rmb 2 ; CPU SWI vector CPU.NMI rmb 2 ; CPU NMI vector CPU.RESET rmb 2 ; CPU RESET/startup vector *pragmapop list