;
;
;
Commodore VIC-20 ROM Memory Map
V1.0 1 Sep 1994
;
; Data types in headers (for reassembler):
;
;
DATA
Misc data
;
TEXT
String terminated with 00
;
WORD
Vectors in LO/HI byte pairs
;
CHIP
I/O Area
;
EMPTY
ROM containing FF's or AA's
;
;
; BASIC v2.0 interpreter ROM ($B000 - $DFFF)
; This is almost identical to the C64 one.
;
c000
c004
c00c
c052
c080
c09e
c129
c140
c14d
c19e
c328
c364
;c364
;c369
Basic Restart Vectors
'cbmbasic'
DATA
stmdsp
BASIC Command Vectors
fundsp
BASIC Function Vectors
optab BASIC Operator Vectors
reslst
BASIC Command Keyword Table
msclst
BASIC Misc. Keyword Table
oplist
BASIC Operator Keyword Table
funlst
BASIC Function Keyword Table
errtab
Error Message Table
errptr
Error Message Pointers
okk
Misc. Messages
'<cr>ok<cr>'
'error'
WORD
c389
c38a
c3b8
c3fb
c408
c435
c437
c469
c474
c480
c49c
c4a2
c533
c560
c579
c613
c642
c65e
c68e
c69c
Unused byte
DATA
fndfor
Find FOR/GOSUB Entry on Stack
bltu Open Space in Memory
getstk
Check Stack Depth
reason
Check Memory Overlap
omerr Output ?OUT OF MEMORY Error
error Error Routine
errfin
Break Entry
ready Restart BASIC
main Input & Identify BASIC Line
main1 Get Line Number & Tokenise Text
inslin
Insert BASIC Text
linkprg
Rechain Lines
inlin Input Line Into Buffer
crunch
Tokenise Input Buffer
fndlin
Search for Line Number
scrtch
Perform [new]
clear Perform [clr]
stxpt Reset TXTPTR
list Perform [list]
WORD
WORD
WORD
DATA
DATA
DATA
DATA
DATA
WORD
DATA
TEXT
DATA
c717
c742
c7ae
c7c4
c7e1
c7ed
c81d
c82c
c857
c871
c883
c8a0
c8d2
c8f8
c906
c928
c93b
c94b
c96b
c9a5
c9c4
c9d6
c9d9
c9e3
ca2c
ca80
ca86
ca9a
caa0
cab8
cad7
cae8
cb1e
cb3b
cb4d
cb7b
cba5
cbbf
cbea
cbf9
cc06
cc35
ccfc
;ccfc
;cd0c
qplop Handle LIST Character
for
Perform [for]
newstt
BASIC Warm Start
ckeol Check End of Program
gone Prepare to execute statement
gone3 Perform BASIC Keyword
restor
Perform [restore]
stop Perform [stop], [end], break
cont Perform [cont]
run
Perform [run]
gosub Perform [gosub]
goto Perform [goto]
return
Perform [return]
data Perform [data]
datan Search for Next Statement / Line
if
Perform [if]
rem
Perform [rem]
ongoto
Perform [on]
linget
Fetch linnum From BASIC
let
Perform [let]
putint
Assign Integer
ptflpt
Assign Floating Point
putstr
Assign String
puttim
Assign TI$
getspt
Add Digit to FAC#1
printn
Perform [print#]
cmd
Perform [cmd]
strdon
Print String From Memory
print Perform [print]
varop Output Variable
crdo Output CR/LF
comprt
Handle comma, TAB(, SPC(
strout
Output String
outspc
Output Format Character
doagin
Handle Bad Data
get
Perform [get]
inputn
Perform [input#]
input Perform [input]
bufful
Read Input Buffer
qinlin
Do Input Prompt
read Perform [read]
rdget General Purpose Read Routine
exint Input Error Messages
'?extra ignored<cr>'
'?redo from start<cr>'
cd1e
cd61
cd8a
cd9e
ce83
cea8
cead
cef1
next Perform [next]
donext
Check Valid Loop
frmnum
Confirm Result
frmevl
Evaluate Expression in Text
eval Evaluate Single Term
pival Constant - pi
DATA
qdot Continue Expression
parchk
Expression in Brackets
DATA
cef7
cef7
cefa
cefd
cf08
cf0d
cf14
cf28
cf48
cfa7
cfb1
cfd1
cfe6
d016
d01b
d02e
d07e
d08b
d0e7
d11d
d128
d194
d1a5
d1aa
d1b2
d1bf
d1d1
d218
d245
d248
d261
d30e
d34c
d37d
d391
d39e
d3a6
d3e1
d3f4
d465
d487
d4d5
d4f4
d526
d5bd
d606
d63d
d67a
d6a3
d6db
d6ec
d700
d72c
d737
chkcls
Confirm Character
-test ')'-test '('-test commasynerr
Output ?SYNTAX Error
domin Set up NOT Function
rsvvar
Identify Reserved Variable
isvar Search for Variable
tisasc
Convert TI to ASCII String
isfun Identify Function Type
strfun
Evaluate String Function
numfun
Evaluate Numeric Function
orop Perform [or], [and]
dorel Perform <, =, >
numrel
Numeric Comparison
strrel
String Comparison
dim
Perform [dim]
ptrget
Identify Variable
ordvar
Locate Ordinary Variable
notfns
Create New Variable
notevl
Create Variable
aryget
Allocate Array Pointer Space
n32768
Constant 32768 in Flpt
DATA
facinx
FAC#1 to Integer in (AC/YR)
intidx
Evaluate Text for Integer
ayint FAC#1 to Positive Integer
isary Get Array Parameters
fndary
Find Array
bserr '?bad subscript error'
'?illegal quantity error'
notfdd
Create Array
inlpn2
Locate Element in Array
umult Number of Bytes in Subscript
fre
Perform [fre]
givayf
Convert Integer in (AC/YR) to Flpt
pos
Perform [pos]
errdir
Confirm Program Mode
getfnm
Check Syntax of FN
fndoer
Perform [fn]
strd Perform [str$]
strlit
Set Up String
putnw1
Save String Descriptor
getspa
Allocate Space for String
garbag
Garbage Collection
dvars Search for Next String
grbpas
Collect a String
cat
Concatenate Two Strings
movins
Store String in High RAM
frestr
Perform String Housekeeping
frefac
Clean Descriptor Stack
chrd Perform [chr$]
leftd Perform [left$]
rightd
Perform [right$]
midd Perform [mid$]
d761
d77c
d782
d78b
d79b
d7ad
d7b5
d7eb
d7f7
d80d
d824
d82d
d849
d850
d862
d867
d947
d97e
d983
d9bc
d9ea
da28
da59
da8c
dab7
dad4
dae2
daf9
dafe
db07
db0f
dba2
dbc7
dbfc
dc0c
dc1b
dc2b
dc39
dc58
dc5b
dc9b
dccc
dcf3
ddb3
ddc2
dddd
de68
df11
df71
df7b
dfb4
dfbf
dfed
pream Pull sTring Parameters
len
Perform [len]
len1 Exit String Mode
asc
Perform [asc]
gtbytc
Evaluate Text to 1 Byte in XR
val
Perform [val]
strval
Convert ASCII String to Flpt
getnum
Get parameters for POKE/WAIT
getadr
Convert FAC#1 to Integer in LINNUM
peek Perform [peek]
poke Perform [poke]
wait Perform [wait]
faddh Add 0.5 to FAC#1
fsub Perform Subtraction
fadd5 Normalise Addition
fadd Perform Addition
negfac
2's Complement FAC#1
overr Output ?OVERFLOW Error
mulshf
Multiply by Zero Byte
fone Table of Flpt Constants
DATA
log
Perform [log]
fmult Perform Multiply
mulply
Multiply by a Byte
conupk
Load FAC#2 From Memory
muldiv
Test Both Accumulators
mldvex
Overflow / Underflow
mul10 Multiply FAC#1 by 10
tenc Constant 10 in Flpt
DATA
div10 Divide FAC#1 by 10
fdiv Divide FAC#2 by Flpt at (AC/YR)
fdivt Divide FAC#2 by FAC#1
movfm Load FAC#1 From Memory
mov2f Store FAC#1 in Memory
movfa Copy FAC#2 into FAC#1
movaf Copy FAC#1 into FAC#2
round Round FAC#1
sign Check Sign of FAC#1
sgn
Perform [sgn]
abs
Perform [abs]
fcomp Compare FAC#1 With Memory
qint Convert FAC#1 to Integer
int
Perform [int]
fin
Convert ASCII String to a Number in FAC#1
n0999 String Conversion Constants
DATA
inprt Output 'IN' and Line Number
fout Convert FAC#1 to ASCII String
foutim
Convert TI to String
fhalf Table of Constants
DATA
sqr
Perform [sqr]
fpwrt Perform power ($)
negop Negate FAC#1
logeb2
Table of Constants
DATA
exp
Perform [exp]
;
;
;
VIC-20 Kernel ROM
;e000
e040
e08a
e094
e0f6
e109
e10f
e115
e11b
e121
e127
e153
e162
e1bb
e1c4
e1d1
e1fd
e203
e20b
e216
e261
e268
e2b1
e2dd
(exp continues) EXP continued From BASIC ROM
polyx Series Evaluation
rmulc Constants for RND
DATA
rnd
Perform [rnd]
bioerr
Handle I/O Error in BASIC
bchout
Output Character
bchin Input Character
bckout
Set Up For Output
bckin Set Up For Input
bgetin
Get One Character
sys
Perform [sys]
savet Perform [save]
verfyt
Perform [verify / load]
opent Perform [open]
closet
Perform [close]
slpara
Get Parameters For LOAD/SAVE
combyt
Get Next One Byte Parameter
deflt Check Default Parameters
cmmerr
Check For Comma
ocpara
Get Parameters For OPEN/CLOSE
cos
Perform [cos]
sin
Perform [sin]
tan
Perform [tan]
pi2
Table of Trig Constants
DATA
;e2dd 1.570796327 pi/2
;e2e2 6.28318531 pi*2
;e2e7 0.25
;e2ec
;e2ed
;e2f2
;e2f7
;e2fc
;e301
;e306
#05
(counter)
-14.3813907
42.0077971
-76.7041703
81.6052237
-41.3417021
6.28318531
e30b
e33b
atn
Perform [atn]
atncon
Table of ATN Constants
;e33b
;e3ec
;e341
;e346
;e34b
;e350
;e355
;e35a
;e35f
;e364
#0b
(counter)
-0.000684793912
0.00485094216
-0.161117018
0.034209638
-0.0542791328
0.0724571965
-0.0898023954
0.110932413
-0.142839808
DATA
;e369 0.19999912
;e36e -0.333333316
;e373 1.00
e378
e387
e39f
;e39f
e3a4
e404
e429
;e429
;e436
init BASIC Cold Start
initat
CHRGET For Zero-page
rndsed
RND Seed For zero-page
0.811635157
initcz
Initialize BASIC RAM
initms
Output Power-Up Message
words Power-Up Message
DATA
' bytes free<cr>'
'<clr>**** cbm basic v2 ****<cr>'
e44f
e45b
e467
bvtrs Table of BASIC Vectors (for 0300) WORD
initv Initialize Vectors
bassft
BASIC Warm Restart [RUNSTOP-RESTORE]
e475
e47c
e4a0
e4a9
e4b2
e4bc
e4c1
e4cf
e4da
?
-
e500
e505
e50a
e518
e55f
e581
e587
e5b5
e5bb
e5cf
e5e5
e64f
e6b8
e6c5
e6ea
e719
e72d
e742
e756
e800
e8c3
e8d8
e8e8
e8fa
e912
e921
iobase
Return I/O Base Address
screen
Return Screen Organization
plot Read / Set Cursor X/Y Position
cint1 Initialize I/O
Clear Screen
Home Cursor
Set Screen Pointers
Set I/O Defaults (Unused Entry)
Set I/O Defaults
lp2
Get Character From Keyboard Buffer
Input From Keyboard
Input From Screen or Keyboard
Quotes Test
Set Up Screen Print
Advance Cursor
Retreat Cursor
Back on to Previous Line
Output to Screen
-unshifted characters-shifted charactersGo to Next Line
Output <CR>
Check Line Decrement
Check Line Increment
Set Colour Code
Colour Code Table
DATA
DATA
Unused Bytes For Future Patches
EMPTY
Serial Output 1
Serial Output 0
Get Serial Data And Clock In
Get Secondary Address patch for Serial LOAD/VERIFY
Relocated Load patch for Serial LOAD/VERIFY
Tape Write patch for CLOSE
Unused
EMPTY
e929
?
DATA
e975
e9ee
ea56
ea6e
ea7e
ea8d
eaa1
eab2
eabf
eb1e
eb71
ec46
ec5e
ec9f
ece0
ed21
ed69
eda3
Scroll Screen
Open A Space On The Screen
Move A Screen Line
Syncronise Colour Transfer
Set Start of Line
Clear Screen Line
Print To Screen
Syncronise Colour Pointer
Main IRQ Entry Point
scnkey
Scan Keyboard
Process Key Image
Pointers to Keyboard decoding tables
WORD
Keyboard Decoding Table
- Unshifted DATA
Keyboard Decoding Table
- Shifted DATA
Keyboard Decoding Table
- Commodore DATA
Graphics/Text Control
Keyboard Decoding Table
DATA
Keyboard Decoding Table
- Control DATA
ede4
edf4
edfd
ee14
ee17
ee49
eeb4
eeb4
eeb7
Video Chip Set Up Table
Shift-Run Equivalent
DATA
Low Byte Screen Line Addresses
talk Send TALK Command on Serial Bus
listn Send LISTEN Command on Serial Bus
Send Data On Serial Bus
Flag Errors
Status #80 - device not present
Status #03 - write timeout
eec0
eec5
eece
eed3
eee4
eef6
ef04
ef19
ef84
ef8d
ef96
efa3
efee
f016
f019
f021
f027
f036
f05b
f068
f0bc
f0ed
second
Send LISTEN Secondary Address
Clear ATN
tksa Send TALK Secondary Address
Wait For Clock
ciout Send Serial Deferred
untlk Send UNTALK on Serial Bus
unlsn Send UNLISTEN on Serial Bus
acptr Receive From Serial Bus
Serial Clock On
Serial Clock Off
Delay 1 ms
RS-232 Send
Send New RS-232 Byte
'No DSR' Error
'No CTS' Error
Disable Timer
Compute Bit Count
RS-232 Receive
Set Up To Receive
Process RS-232 Byte
Submit to RS-232
Send to RS-232 Buffer
DATA
DATA
f116
f14f
f160
-
Input From RS-232
Get From RS-232
Serial Bus Idle
f174 Table of Kernal I/O Messages
;f174 '<cr> i/o error #'
; ...
;f1df 'ok<cr>'
f1e2
f1e6
f1f5
f20e
f250
f27a
f2c7
f309
f34a
f3cf
f3df
f3ef
f3f3
f40a
f495
f4c7
f542
f549
f55c
f5ca
f647
f659
f66a
f675
f685
f692
f6f1
f728
f734
f760
f767
f770
Print Message if Direct
Print Message
getin Get a byte
chrin Input a byte
Get From Tape / Serial / RS-232
chrout
Output One Character
chkin Set Input Device
chkout
Set Output Devic
close Close File
Find File
Set File values
clall Abort All Files
clrchn
Restore Default I/O
open Open File
Send Secondary Address
Open RS-232
load Load RAM From Device
LOAD -loadLoad File From Serial Bus
Load File From Tape
Print "SEARCHING"
Print Filename
Print "LOADING / VERIFYING"
save Save RAM To Device
SAVE -saveSave to Serial Bus
Save to Tape
Print "SAVING"
udtim Increment Real-Time Clock
rdtim Read Real-Time Clock
settim
Set Real-Time Clock
STOP Check STOP Key
;f77e
f77e
f781
f784
f787
f78a
f78d
f790
f793
f796
Output I/O Error Messages
'too many files'
'file open'
'file not open'
'file not found'
'device not present'
'not input file'
'not output file'
'missing filename'
'illegal device number'
f7af
-
Find Any Tape Header
DATA
f7e7
f84d
f854
f867
f88a
f894
f8ab
f8b7
f8c0
f8e3
f8f4
f94b
f95d
f98e
faad
-
fbd2
fbdb
fbea
fc06
fc95
fccf
fcf6
fd08
fd11
fd1b
fd22
fd3f
fd4d
fd52
fd57
fd6d
fd8d
fdf1
fdf9
fe39
fe49
fe50
fe57
fe66
fe6f
fe73
fe82
fea9
fed2
;fed2
Reset Tape Pointer
New Character Setup
Send Tone to Tape
Write Data to Tape
Write Tape Leader
Restore Normal IRQ
Set IRQ Vector
Kill Tape Motor
Check Read / Write Pointer
Bump Read / Write Pointer
Power-Up RESET Entry
Check For A-ROM
ROM Mask 'a0CBM'
DATA
restor
Restore Kernal Vectors (at 0314)
vector
Change Vectors For User
Kernal Reset Vectors
WORD
ramtas
Initialise System Constants
IRQ Vectors For Tape I/O
WORD
ioinit
Initialise I/O
Enable Timer
setnam
Set Filename
setlfs
Set Logical File Parameters
readss
Get I/O Status Word
setmsg
Control OS Messages
settmo
Set IEEE Timeout
memtop
Set / Read Top of Memory
membot
Set / Read Bottom of Memory
NMI Transfer Entry
Warm Start Basic [BRK]
User Vector (default BRK)
ff56
ff5b
ff72
Write Tape Header
Get Buffer Address
Set Buffer Stat / End Pointers
Find Specific Tape Header
Bump Tape Pointer
Print "PRESS PLAY ON TAPE"
Check Tape Status
Print "PRESS RECORD..."
Initiate Tape Read
Initiate Tape Write
Common Tape Code
Check Tape Stop
Set Read Timing
Read Tape Bits
Store Tape Characters
Exit Interrupt
RS-232 Timing Table
IRQ Transfer Entry
;
;ff8a Vic-20 Kernel Jump Table
DATA
;
ff8a
ff8d
ff90
ff93
ff96
ff99
ff9c
ff9f
ffa2
ffa5
ffa8
ffab
ffae
ffb1
ffb4
ffb7
ffba
ffbd
ffc0
ffc3
ffc6
ffc9
ffcc
ffcf
ffd2
ffd5
ffd8
ffdb
ffde
ffe1
ffe4
ffe7
ffea
ffed
fff0
fff3
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
$fd52 restor
$fd57 vector
$fe66 setmsg
$eec0 secnd
$eece tksa
$fe73 memtop
$fe82 membot
$eb1e scnkey
$fe6f settmo
$ef19 acptr
$eee4 ciout
$eef6 untalk
$ef04 unlsn
$ee17 listn
$ee14 talk
$fe57 readss
$fe50 setlfs
$fe49 setnam
($031a) (iopen)
($031c) (iclose)
($031e) (ichkin)
($0320) (ichkout)
($0322) (iclrch)
($0324) (ichrin)
($0326) (ichrout)
$f542 load
$f675 save
$f767 settim
$f760 rdtim
($0328) (istop)
($032a) (igetin)
($032c) (iclall)
$f734 udtim
$e505 screen
$e50a plot
$e500 iobase
;fff6 Unused Vectors
fff6 [ffff]
fff8 [ffff]
;fffa
fffa
fffc
fffe
Transfer Vectors
[fea9]
NMI
[fd22]
RESET
[ff72]
IRQ
Restore Vectors
Change Vectors For User
Control OS Messages
Send SA After Listen
Send SA After Talk
Set/Read System RAM Top
Set/Read System RAM Bottom
Scan Keyboard
Set Timeout In IEEE
Handshake Serial Byte In
Handshake Serial Byte Out
Command Serial Bus UNTALK
Command Serial Bus UNLISTEN
Command Serial Bus LISTEN
Command Serial Bus TALK
Read I/O Status Word
Set Logical File Parameters
Set Filename
Open Vector [F40A]
Close Vector [F34A]
Set Input [F2C7]
Set Output [F309]
Restore I/O Vector [F353]
Input Vector, chrin [F20E]
Output Vector, chrout [F27A]
Load RAM From Device
Save RAM To Device
Set Real-Time Clock
Read Real-Time Clock
Test-Stop Vector [F770]
Get From Keyboad [F1F5]
Close All Channels And Files [F3EF]
Increment Real-Time Clock
Return Screen Organization
Read / Set Cursor X/Y Position
Return I/O Base Address