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Initial check in with cleaned up sources This is the initial check in the source code in a state where it builds byte accurate copies of all the various ROM versions included.
author William Astle <lost@l-w.ca>
date Sat, 08 Dec 2018 19:57:01 -0700
parents
children 704b2c9dc19e
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-1:000000000000 0:605ff82c4618
1 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
2 ; First, some useful macro definitions to avoid most instances with FCB standing for actual code.
3 skip1 macro noexpand
4 fcb 0x21 ; opcode of BRN which causes next code byte to be skipped
5 endm
6 skip2 macro noexpand
7 fcb 0x8c ; opcode of CMPX immediate which will skip two bytes (but clobbers flags)
8 endm
9 skip2keepc macro noexpand
10 fcb 0x7d ; opcode of TST extended which will skip two bytes like above but preserves C
11 endm
12 skip1lda macro noexpand
13 fcb 0x86 ; opcode of LDA immediate; used to load A with nonzero and skip a CLRA, usually
14 endm
15 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
16 ; Now various constants used in the ROMs.
17 STKBUF equ 58 ; extra room kept between the stack and variables during memory checks
18 DEBDEL equ 0x45e ; delay constant for debouncing the keyboard (10ms at standard clock speed)
19 LBUFMX equ 250 ; size of the line input buffer
20 MAXLIN equ 0xfa ; the maximum MS byte of a line number
21 DOSBUF equ 0x2600 ; address where DOS command loads track 24
22 DIRLEN equ 32 ; size of a directory entry on disk
23 SECLEN equ 256 ; length of a disk sector
24 SECMAX equ 18 ; number of sectors per track
25 TRKLEN equ SECMAX*SECLEN ; number of bytes on a track
26 TRKMAX equ 35 ; number of tracks per disk
27 FATLEN equ 6+(TRKMAX-1)*2 ; size of memory copy of a file allocation table
28 GRANMX equ (TRKMAX-1)*2 ; number of granules per disk
29 FCBLEN equ SECLEN+25 ; size of a file control block
30 INPFIL equ 0x10 ; input file type
31 OUTFIL equ 0x20 ; output file type
32 RANFIL equ 0x40 ; random file type
33 ROWMAX equ 24 ; the number of rows on the hi-res text screen
34 HRESSCRN equ 0x2000 ; where the hi-res text screen starts in logical memory
35 HRESBUFF equ 0xc000 ; where the HGET/HPUT buffers are in logical memory
36 TMPSTACK equ 0xdfff ; temporary stack location when in secondary memory map
37 CURCHAR equ SPACE ; hi-res text screen cursor character
38 ; HGET/HPUT buffer header structure
39 HB.ADDR equ 0 ; address of next buffer (2 bytes)
40 HB.NUM equ 2 ; number of this buffer (1 byte)
41 HB.SIZE equ 3 ; number of bytes in this buffer (2 bytes)
42 HB.LEN equ 5 ; number of bytes in a buffer header
43 ; Video register definitions
44 ; INIT0
45 COCO equ 0x80 ; 1 = Coco2 compatible mode
46 MMUEN equ 0x40 ; 1 = MMU enabled
47 IEN equ 0x20 ; 1 = IRQ enabled
48 FEN equ 0x10 ; 1 = FIRQ enabled
49 MC3 equ 0x08 ; 1 = FExx constant page enabled
50 MC2 equ 0x04 ; 1 = Standard SCS operation
51 MC1 equ 0x02 ; ROM map control bit 1
52 MC0 equ 0x01 ; ROM map control bit 0
53 ; Interrupt enable/status bits
54 TMR equ 0x20 ; TIMER
55 HBORD equ 0x10 ; horizontal border
56 VBORD equ 0x08 ; vertical border
57 EI2 equ 0x04 ; serial data
58 EI1 equ 0x02 ; keyboard
59 EI0 equ 0x01 ; cartridge port
60 ; Memory block definitions
61 BLOCK6.0 equ 0x30 ; hi-res graphics screen
62 BLOCK6.1 equ 0x31 ; hi-res graphics screen
63 BLOCK6.2 equ 0x32 ; hi-res graphics screen
64 BLOCK6.3 equ 0x33 ; hi-res graphics screen
65 BLOCK6.4 equ 0x34 ; HGET/HPUT buffers
66 BLOCK6.5 equ 0x35 ; stack space for hi-res graphics operations
67 BLOCK6.6 equ 0x36 ; hi-res text screen
68 BLOCK6.7 equ 0x37 ; unused by Basic
69 BLOCK7.0 equ 0x38 ; standard 64K memory map
70 BLOCK7.1 equ 0x39 ; standard 64K memory map
71 BLOCK7.2 equ 0x3a ; standard 64K memory map
72 BLOCK7.3 equ 0x3b ; standard 64K memory map
73 BLOCK7.4 equ 0x3c ; standard 64K memory map
74 BLOCK7.5 equ 0x3d ; standard 64K memory map
75 BLOCK7.6 equ 0x3e ; standard 64K memory map
76 BLOCK7.7 equ 0x3f ; standard 64K memory map (constant page comes from this block)
77 ; Disk Basic FAT data format. The memory image contains a six byte header followed by the cached copy
78 ; of the FAT from the disk. The cached copy may be modified compared to the copy on disk. This is indicated
79 ; by a nonzero of the "FAT1" byte.
80 FAT0 equ 0 ; active file counter for this image
81 FAT1 equ 1 ; data changed flag - nonzero means write is needed
82 FATCON equ 6 ; offset to start of FAT data
83 ; Directory entry format. Entries are 32 bytes long but only the first 16 are used.
84 DIRNAM equ 0 ; file name (8 characters)
85 DIREXT equ 8 ; extention (3 characters)
86 DIRTYP equ 11 ; file type number
87 DIRASC equ 12 ; ASCII flag
88 DIRGRN equ 13 ; first granule number for the file
89 DIRLST equ 14 ; number of bytes used in last sector (two bytes are needed)
90 ; File control block format.
91 FCBTYP equ 0 ; file type: 0x40=RANDOM, 0x20=WRITE, 0x10=READ
92 FCBDRV equ 1 ; drive number
93 FCBFGR equ 2 ; first granule in the file
94 FCBCGR equ 3 ; current granule being used
95 FCBSEC equ 4 ; current sector within granule
96 FCBCPT equ 5 ; input file - next char to be read; output: sector full flag (sequential)
97 FCBPOS equ 6 ; current print position (0 for random files)
98 FCBREC equ 7 ; current record number (random files)
99 FCBRLN equ 9 ; random file record length
100 FCBBUF equ 11 ; pointer to the start of this files buffer
101 FCBSOF equ 13 ; sector offset to current position in the record
102 FCBFLG equ 15 ; GET/PUT flag
103 FCBCFL equ 16 ; cache flag: nonzero is cache full (sequential)
104 FCBCDT equ 17 ; cache byte (sequential)
105 FCBDIR equ 18 ; directory entry number
106 FCBLST equ 19 ; number of bytes in last sector of the file
107 FCBGET equ 21 ; GET record counter (how many pulled from record)
108 FCBPUT equ 23 ; PUT record counter (where to put next byte in record)
109 FCBDFL equ 23 ; input file: data left flag (nonzero is no data)
110 FCBLFT equ 24 ; number of characters left in input file buffer
111 FCBCON equ 25 ; offset to data buffer
112 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
113 ; This is the memory map and variable definitions for the entire system (all levels of Basic)
114 ; NOTE: unnamed variables (Vxx) are generally scratch variables used for various purpose. As such, no further description is
115 ; provided for those.
116 org 0
117 setdp 0
118 ENDFLG rmb 1 ; STOP/END flag: bit 7 set means STOP, bit 7 clear means END
119 CHARAC rmb 1 ; terminator character for searches
120 ENDCHR rmb 1 ; terminator character for searches
121 TMPLOC rmb 1 ; scratch variable
122 IFCTR rmb 1 ; number of "IF" statements encountered while scanning a line
123 DIMFLG rmb 1 ; nonzero means dimensioning, zero means evaluating (when parsing array)
124 VALTYP rmb 1 ; the type of the current value when evaluating expressions
125 GARBFL rmb 1 ; flag for whether garbage collection has been done yet when allocating strings
126 ARYDIS rmb 1 ; nonzero means don't parse arrays when parsing variables
127 INPFLG rmb 1 ; are we running INPUT or READ - nonzero for INPUT
128 RELFLG rmb 1 ; which relational operators are currently in play
129 TEMPPT rmb 2 ; pinter to the top of the string stack
130 LASTPT rmb 2 ; pointer to the last entry on the string stack
131 TEMPTR rmb 2 ; scratch pointer
132 TMPTR1 rmb 2 ; scratch pointer
133 FPA2 rmb 4 ; floating point accumulator, mantissa only
134 BOTSTK rmb 2 ; bottom of stack during last check; also a scratch variable
135 TXTTAB rmb 2 ; pointer to the beginning of the program
136 VARTAB rmb 2 ; pointer to the beginning of the scalar variable table (end of program)
137 ARYTAB rmb 2 ; pointer to the beginning of the array table (end of scalars)
138 ARYEND rmb 2 ; pointer to the end of the array table (start of free memory)
139 FRETOP rmb 2 ; top of free memory (start of string space)
140 STRTAB rmb 2 ; start of allocates string space
141 FRESPC rmb 2 ; pointer to newly allocated string space
142 MEMSIZ rmb 2 ; top of memory (and string space) allowed for the interpreter to size
143 OLDTXT rmb 2 ; save line number during STOP
144 BINVAL rmb 2 ; binary value of line number during parsing
145 OLDPTR rmb 2 ; saving input pointer during STOP
146 TINPTR rmb 2 ; temporary input pointer storage
147 DATTXT rmb 2 ; line number where we're looking for DATA
148 DATPTR rmb 2 ; input pointer where we're looking for DATA
149 DATTMP rmb 2 ; scratch pointer for INPUT and READ
150 VARNAM rmb 2 ; storage for variable name during parsing
151 VARPTR rmb 2 ; pointer to variable descriptor
152 VARDES rmb 2 ; pointer to variable descriptor
153 RELPTR rmb 2 ; pointer to relational operator processing routine
154 TRELFL rmb 1 ; temporary relational operator flags
155 V40 rmb 1
156 V41 rmb 1
157 V42 rmb 1
158 V43 rmb 1
159 V44 rmb 1
160 V45 rmb 1
161 V46 rmb 1
162 V47 rmb 1
163 V48 rmb 2
164 V4A rmb 1
165 V4B rmb 2
166 V4D rmb 2
167 FP0EXP rmb 1 ; floating point accumulator #0 exponent
168 FPA0 rmb 4 ; floating point accumulator #0 mantissa
169 FP0SGN rmb 1 ; floating point accumulator #0 sign
170 COEFCT rmb 1 ; polynomial expansion coefficient counter
171 STRDES rmb 5 ; temporary string descriptor
172 FPCARY rmb 1 ; floating point carry byte
173 FP1EXP rmb 1 ; floating point accumulator #1 exponent
174 FPA1 rmb 4 ; floating point accumulator #1 mantissa
175 FP1SGN rmb 1 ; floating point accumulator #1 sign
176 RESSGN rmb 1 ; pre-calculated result sign
177 FPSBYT rmb 1 ; floating point extra precision underflow byte
178 COEFPT rmb 2 ; polynomial expansion coefficient pointer
179 LSTTXT rmb 2 ; current line pointer during LIST
180 CURLIN rmb 2 ; line number of currently executing statement (0xffff for direct)
181 DEVCFW rmb 1 ; width of tab field for current device
182 DEVLCF rmb 1 ; column of last tab field for current device
183 DEVPOS rmb 1 ; current output column for current device
184 DEVWID rmb 1 ; number of characters per line for current device
185 PRTDEV rmb 1 ; print device flag: 0xff for non-display device (tape)
186 DEVNUM rmb 1 ; current I/O device/file number (signed)
187 CINBFL rmb 1 ; EOF flag for console in (0xff for EOF)
188 RSTFLG rmb 1 ; warm start enable flag: 0x55 for enabled
189 RSTVEC rmb 2 ; pointer to warm start routine (must start with NOP)
190 TOPRAM rmb 2 ; the actual top of memory
191 rmb 2 ; *unused*
192 FILSTA rmb 1 ; status of tape file (0=closed, 1=input, 2=output)
193 CINCTR rmb 1 ; number of characters in buffer
194 CINPTR rmb 2 ; pointer to current buffer location
195 BLKTYP rmb 1 ; cassette block type
196 BLKLEN rmb 1 ; length of cassette block
197 CBUFAD rmb 2 ; pointer to data buffer for cassette I/O
198 CCKSUM rmb 1 ; cassette checksum
199 CSRERR rmb 1 ; cassette error flag/charactercount
200 CPULWD rmb 1 ; pulse width counter
201 CPERTM rmb 1 ; bit counter
202 CBTPHA rmb 1 ; sync phase flag
203 CLSTSN rmb 1 ; last sine table entry
204 GRBLOK rmb 1 ; graphic block value for SET/RESET/POINT
205 IKEYIM rmb 1 ; cached key read during BREAK check
206 CURPOS rmb 2 ; screen cursor position
207 ZERO rmb 2 ; always kept as 0
208 SNDTON rmb 1 ; tone value for SOUND
209 SNDDUR rmb 2 ; duration value for SOUND
210 CMPMID rmb 1 ; 1200/2400 Hz partition (why is this a variable?)
211 CMP0 rmb 1 ; upper limit of 1200 Hz period (why is this a variable?)
212 CMP1 rmb 1 ; upper limit of 2400 Hz period (why is this a variable?)
213 SYNCLN rmb 2 ; number of 0x55s for a cassette leader (why is this a variable?)
214 BLKCNT rmb 1 ; cursor blink delay counter
215 LPTBTD rmb 2 ; serial baud rate delay count
216 LPTLND rmb 2 ; delay for waiting for carriage return
217 LPTCFW rmb 1 ; tab field width for printer
218 LPTLCF rmb 1 ; last tab field position for printer
219 LPTWID rmb 1 ; width of printer line
220 LPTPOS rmb 1 ; current character position for printer
221 EXECJP rmb 2 ; default jump address for EXEC
222 GETNCH rmb 6 ; fetch next character for interpretation (INC CHARAD+1\BNE GETCCH\INC CHARAD)
223 GETCCH rmb 1 ; re-fetch the current character for interpretation (opcode of LDA extended)
224 CHARAD rmb 2 ; current input pointer
225 rmb 3 ; (JMP BROMHK)
226 VAB rmb 1
227 VAC rmb 1
228 VAD rmb 1
229 VAE rmb 1
230 TRCFLG rmb 1 ; is TRACE enabled? nonzero is on
231 USRADR rmb 2 ; address of the start of USR vectors
232 FORCOL rmb 1 ; bitmap foreground colour
233 BAKCOL rmb 1 ; bitmap background colour
234 WCOLOR rmb 1 ; bitmap working colour
235 ALLCOL rmb 1 ; byte with all pixels set to WCOLOR
236 PMODE rmb 1 ; which PMODE is active
237 ENDGRP rmb 2 ; end of current bitmap graphics page
238 HORBYT rmb 1 ; number of bytes per bitmap row
239 BEGGRP rmb 2 ; start of current bitmap graphics page
240 GRPRAM rmb 1 ; MSB of start of bitmap graphics
241 HORBEG rmb 2 ; horizontal starting coordinate
242 VERBEG rmb 2 ; vertical starting coordinate
243 CSSVAL rmb 1 ; SCREEN's colour set value
244 SETFLG rmb 1 ; doing PSET or PRESET? (nonzero = PSET)
245 HOREND rmb 2 ; horizontal ending coordinate
246 VEREND rmb 2 ; vertical ending coordinate
247 HORDEF rmb 2 ; default horizontal coordinate
248 VERDEF rmb 2 ; default vertical coordinate
249 VCB rmb 2
250 VCD rmb 2
251 VCF rmb 2
252 VD1 rmb 2
253 VD3 rmb 1
254 VD4 rmb 1
255 VD5 rmb 1
256 VD6 rmb 1
257 VD7 rmb 1
258 VD8 rmb 1
259 VD9 rmb 1
260 VDA rmb 1
261 CHGFLG rmb 1 ; flag indicating if graphic data changed
262 TMPSTK rmb 2 ; temporary stack pointer during PAINT
263 OCTAVE rmb 1 ; PLAY octave
264 VOLHI rmb 1 ; PLAY high volume value
265 VOLLOW rmb 1 ; PLAY low volumnevalue
266 NOTELN rmb 1 ; PLAY notelength
267 TEMPO rmb 1 ; PLAY tempo
268 PLYTMR rmb 2 ; PLAY timer
269 DOTVAL rmb 1 ; PLAY dotted note timer scale factor
270 HRMODE equ * ; Coco3 graphics mode
271 DLBAUD rmb 1 ; DLOAD BAUD constant
272 HRWIDTH equ * ; Coco3 text mode
273 TIMOUT rmb 1 ; DLOAD timeout constant
274 ANGLE rmb 1 ; DRAW angle
275 SCALE rmb 1 ; DRAW scale
276 DCOPC rmb 1 ; DSKCON operation code
277 DCDRV rmb 1 ; DSKCON drive number
278 DCTRK rmb 1 ; DSKCON track number
279 DSEC rmb 1 ; DSKCON sector number
280 DCBPT rmb 2 ; DSKCON buffer pointer
281 DCSTA rmb 1 ; DSKCON status
282 FCBTMP rmb 2 ; temp file control block pointer
283 rmb 13 ; *unused*
284 SW3VEC rmb 3 ; SWI3 vector
285 SW2VEC rmb 3 ; SWI2 vector
286 SWIVEC rmb 3 ; SWI vector
287 NMIVEC rmb 3 ; NMI vector
288 IRQVEC rmb 3 ; IRQ vector
289 FRQVEC rmb 3 ; FIRQ vector
290 TIMVAL equ * ; Extended Basic TIMER value (2 bytes only)
291 USRJMP rmb 3 ; jump address for USR function
292 RVSEED rmb 5 ; floating point random number seed
293 CASFLG rmb 1 ; capslock state for keyboard
294 DEBVAL rmb 2 ; keyboar debounce delay (why is this a variable?)
295 EXPJMP rmb 3 ; exponentiation handler
296 COMVEC rmb 10 ; Color Basic's command table
297 rmb 10 ; Extended Basic's command table
298 rmb 10 ; Disk Basic's command table
299 USR0 rmb 20 ; ECB USR jump addresses (extra user command table and unused for Disk Basic)
300 KEYBUF rmb 8 ; keyboard state table
301 POTVAL rmb 4 ; joystick axis values (left vert, left horiz, right vert, right horiz)
302 RVEC0 rmb 3 ; RAM hook: OPEN
303 RVEC1 rmb 3 ; RAM hook: device number check
304 RVEC2 rmb 3 ; RAM hook: set print parameters
305 RVEC3 rmb 3 ; RAM hook: console out
306 RVEC4 rmb 3 ; RAM hook: console in
307 RVEC5 rmb 3 ; RAM hook: input device number check
308 RVEC6 rmb 3 ; RAM hook: output device number check
309 RVEC7 rmb 3 ; RAM hook: close all files
310 RVEC8 rmb 3 ; RAM hook: close current file
311 RVEC9 rmb 3 ; RAM hook: PRINT
312 RVEC10 rmb 3 ; RAM hook: INPUT
313 RVEC11 rmb 3 ; RAM hook: BREAK check
314 RVEC12 rmb 3 ; RAM hook: line input
315 RVEC13 rmb 3 ; RAM hook: terminating line input
316 RVEC14 rmb 3 ; RAM hook: EOF
317 RVEC15 rmb 3 ; RAM hook: expression evaluation
318 RVEC16 rmb 3 ; RAM hook: ERROR handler (on error goto)
319 RVEC17 rmb 3 ; RAM hook: ERROR handler (regular handling)
320 RVEC18 rmb 3 ; RAM hook: RUN
321 RVEC19 rmb 3 ; RAM hook: parse number
322 RVEC20 rmb 3 ; RAM hook: main interpretation loop
323 RVEC21 rmb 3 ; RAM hook: SET/RESET/POINT
324 RVEC22 rmb 3 ; RAM hook: CLS/ECB secondary/RENUM token/GET/PUT
325 RVEC23 rmb 3 ; RAM hook: crunch line
326 RVEC24 rmb 3 ; RAM hook: uncrunch line
327 STRSTK rmb 8*5 ; string stack
328 CFNBUF rmb 9 ; cassette file name buffer
329 CASBUF rmb 256 ; cassette I/O buffer
330 LINHDR rmb 2 ; header for line input (holds line number when editing program)
331 LINBUF rmb LBUFMX+1 ; line input buffer
332 STRBUF rmb 41 ; temporary string buffer
333 VIDRAM rmb 0x200 ; VDG text screen
334 DBUF0 rmb SECLEN ; Main disk I/O buffer
335 DBUF1 rmb SECLEN ; Secondary disk I/O buffer (used for VERIFY)
336 FATBL0 rmb FATLEN ; File allocation table cache for drive 0
337 FATBL1 rmb FATLEN ; File allocation table cache for drive 1
338 FATBL2 rmb FATLEN ; File allocation table cache for drive 2
339 FATBL3 rmb FATLEN ; File allocation table cache for drive 3
340 FCBV1 rmb 16*2 ; FCB pointers
341 RNBFAD rmb 2 ; start of free random file buffer area
342 FCBADR rmb 2 ; start of file control blocks
343 DNAMBF rmb 8 ; disk file name buffer
344 DEXTBF rmb 3 ; disk file name extension buffer
345 DFLTYP rmb 1 ; disk file type (0=Basic, 1=Data, 2=M/L)
346 DASCFL rmb 1 ; disk file ASCII flag (0=binary, 0xff=ASCII)
347 DRUNFL rmb 1 ; RUN flag (bit 1 set then RUN, bit 0 set then close files)
348 DEFDRV rmb 1 ; default drive number
349 FCBACT rmb 1 ; number of active file control blocks
350 DRESFL rmb 1 ; reset flag - will cause all FCBs to be shut down
351 DLODFL rmb 1 ; load flag - cause a "NEW" on error
352 DMRGFL rmb 1 ; merge flag: nonzero means we're merging
353 DUSRVC rmb 20 ; Disk Basic USR addresses
354 V973 rmb 1
355 V974 rmb 2
356 V976 rmb 1
357 V977 rmb 1
358 V978 rmb 2
359 WFATVL rmb 2 ; number of granules allocated to trigger a FAT cache write
360 DFFLEN rmb 2 ; direct access file recrod length
361 DR0TRK rmb 4 ; current track number for each drive
362 NMIFLG rmb 1 ; nonzero means NMI vectoring is enabled
363 DNMIVC rmb 2 ; address to vector to in NMI
364 RDYTMR rmb 1 ; number of ticks before turning off drive motors
365 DRGRAM rmb 1 ; cached value of write-only disk control register
366 DVERFL rmb 1 ; nonzero means write verifies on
367 ATTCTR rmb 1 ; read/write attempt counter
368 DFLBUF equ * ; start of random file area, FCBs, etc.
369
370
371 org 0x8000
372 EXBAS rmb 0x2000 ; Extended Basic ROM area
373 BASIC rmb 0x2000 ; Color Basic ROM area
374 ROMPAK equ * ; external ROM address
375 DOSBAS rmb 0x2000 ; Disk Basic ROM area
376 rmb 0x1e00 ; Super Extended Basic ROM area
377 ; These are the variables used by SECB on the "constant FExx page" which is unaffected by the MMU
378 ; when the FExx bit in INIT0 is set.
379 H.CRSLOC rmb 2 ; current cursor location pointer (hi-res)
380 H.CURSX rmb 1 ; current X coordinate of the cursor (hi-res)
381 H.CURSY rmb 1 ; current Y coordinate of the cursor (hi-res)
382 H.COLUMN rmb 1 ; the number of columns on the screen (hi-res)
383 H.ROW rmb 1 ; the number of rows on the screen (hi-res)
384 H.DISPEN rmb 2 ; pointer to the end of the screen (hi-res)
385 H.CRSATT rmb 1 ; current cursor attributes (hi-res)
386 rmb 1 ; *unused*
387 H.FCOLOR rmb 1 ; foreground colour (hi-res)
388 H.BCOLOR rmb 1 ; background colour (hi-res)
389 H.ONBRK rmb 2 ; ON BRK GOTO line number
390 H.ONERR rmb 2 ; ON ERR GOTO line number
391 H.ERROR rmb 1 ; most recent error number encountered (-1 for no error)
392 H.ONERRS rmb 2 ; line number where ON ERR GOTO was encountered
393 H.ERLINE rmb 2 ; line number where error actually occurred
394 H.ONBRKS rmb 2 ; line number where ON BRK GOTO was encountered
395 H.ERRBRK rmb 1 ; flag for whether we're processing an error or a break event
396 H.PCOUNT rmb 1 ; number of characters in the HPRINT buffer
397 H.PBUF rmb 80 ; HPRINT line buffer (max 80 characters per line)
398 rmb 132 ; *unused*
399 ; This is the set of primary interrupt vectors on the Coco3. These are here so that systems other
400 ; than Basic do not have to rely on low memory remaining constant. Under Basic, these simply bounce
401 ; to the traditional vectors starting at 0x100.
402 INT.FLAG rmb 1 ; interrupt vector validity flag: 0x55 for valid
403 INT.JUMP equ *
404 INT.SWI3 rmb 3 ; SWI3 bounce vector
405 INT.SWI2 rmb 3 ; SWI2 bounce vector
406 INT.FIRQ rmb 3 ; FIRQ bounce vector
407 INT.IRQ rmb 3 ; IRQ bounce vector
408 INT.SWI rmb 3 ; SWI bounce vector
409 INT.NMI rmb 3 ; NMI bounce vector
410 ; This is that start of the I/O page. Everything above here is hardware defined.
411 PIA0 rmb 4 ; PIA0 (keyboard/joystick)
412 rmb 28 ; PIA0 images (due to sloppy-ass decode)
413 DA equ * ; DAC address
414 PIA1 rmb 4 ; PIA1 (misc hardware)
415 rmb 28 ; PIA1 images (due to sloppy-ass decode)
416 DSKREG rmb 1 ; Disk control register
417 rmb 7 ; images of DSKREG due to (sloppy-ass decode)
418 FDCREG rmb 1 ; FDC command/status register
419 rmb 1 ; FDC track register
420 rmb 1 ; FDC sector register
421 rmb 1 ; FDC data register
422 rmb 4 ; mirror of FDCREG
423 rmb 16 ; unused SCS area
424 rmb 32 ; misc hardware area
425 rmb 16 ; *coco3 reserved*
426 INIT0 rmb 1 ; GIME initialization register 0
427 INIT1 rmb 1 ; GIME initialization register 1
428 IRQENR rmb 1 ; GIME IRQ enable/status register
429 FIRQENR rmb 1 ; GIME FIRQ enable/status register
430 V.TIMER rmb 2 ; GIME timer setting
431 rmb 2 ; *reserved*
432 VIDEOMOD rmb 1 ; GIME video mode register
433 VIDEORES rmb 1 ; GIME video resolution register
434 V.BORDER rmb 1 ; GIME border colour register
435 rmb 1 ; *reserved*
436 V.SCROLL rmb 1 ; GIME vertical scroll register
437 V.OFFSET rmb 2 ; GIME vertical offset (screen address) register
438 H.OFFSET rmb 1 ; GIME horizontal offset register
439 MMUREG rmb 16 ; GIME MMU registers (two tasks of 8)
440 PALETREG rmb 16 ; GIME palette registers
441 SAMREG equ * ; the SAM registers
442 V0CLR rmb 1 ; SAM video mode bits
443 V0SET rmb 1
444 V1CLR rmb 1
445 V1SET rmb 1
446 V2CLR rmb 1
447 V2SET rmb 1
448 F0CLR rmb 1 ; SAM screen address bits
449 F0SET rmb 1
450 F1CLR rmb 1
451 F1SET rmb 1
452 F2CLR rmb 1
453 F2SET rmb 1
454 F3CLR rmb 1
455 F3SET rmb 1
456 F4CLR rmb 1
457 F4SET rmb 1
458 F5CLR rmb 1
459 F5SET rmb 1
460 F6CLR rmb 1
461 F6SET rmb 1
462 rmb 2 ; *reserved*
463 R0CLR rmb 1 ; SAM R0 bit (address dependent speedup)
464 R0SET rmb 1
465 R1CLR rmb 1 ; SAM R1 bit (full speedup/coco3 speedup)
466 R1SET rmb 1
467 rmb 4 ; *reserved*
468 TYCLR rmb 1 ; force ROM mode
469 TYSET rmb 1 ; set RAM mode
470 rmb 18 ; *MPU reserved*
471 SWI3 rmb 2 ; MPU SWI3 vector
472 SWI2 rmb 2 ; MPU SWI2 vector
473 FIRQ rmb 2 ; MPU FIRQ vector
474 IRQ rmb 2 ; MPU IRQ vector
475 SWI rmb 2 ; MPU SWI vector
476 NMI rmb 2 ; MPU NMI vector
477 RESETV rmb 2 ; MPU reset vector