#2235 Problem with PETCAT for CBM-II Basic

[Vladimir Lidovski]

It seems PETCAT (v3.10) can't differ BASIC v4.0 for the PET and BASIC v4.0 for the CBM-II. It knows only the first option. It would be great to add support for the second.
C64-Wiki calls this version 4+ - https://www.c64-wiki.com/wiki/BASIC#Overview_of_BASIC_Version_4+_Commands

Thank you.

[gpz]

good catch, there are some comment in the code that indicate the two are the same - but obviously they are not :)

(if you could point at a complete token list, with their absolute values, that would help a lot)

[Vladimir Lidovski]

Hi
I wrote a small program 'gentokens.c' that generates a Basic program that uses the all possible token numbers from 128 to 255. Then I loaded the generated program 'tokens.prg' into the VICE emulator using 'xpet tokens.prg'. Then I type
OPEN8,8,8,"TOKENS40,S,W"
CMD8
LIST-218
LIST220-236
LIST238-
PRINT#8
CLOSE8
This made the TOKEN40 file on the virtual FS I used. Then I slightly processed the file and got the result list of tokens in 'tokens40x.txt'.
I did the same procedure using 'xcbm2 tokens.prg'. However sometimes it didn't work. It seems there is a tricky error in this emu. The list of tokens I got with
LIST-232
and saved it after the similar processing in 'tokens40+x.txt'. However it seems 'xcbm2' has another bug, I couldn't use the virtual FS. :( So I had to attach a disk image file. I had troubles with a D80-image but I could persuade the emu to work with a D64-image. Sorry I am not going to open a ticket for these bugs. But I hope that my report will be noted.
I also hope this can help to improve PETCAT v3.11.
Regards,

[gpz]

Thanks!

I also found this: https://github.com/mist64/cbmsrc/blob/master/BASIC_CBM2_1984-01-04/tokens

Sould be possible to produce a proper list with this

[Vladimir Lidovski]

In the 'RESERVED WORD LIST', there are the same keywords as in 'tokens40+x.txt' and they are in the same order. However it seems there are some problems. For instance, the 'tokens' document claims that there is token $AB for the plus sign but type
10 ?1+2
in 'xcbm2' and check the expression in VICE monitor. It shows token $AA for the plus... It seems they also missed the token for the pi sign.

[gpz]

I came up with this so far, does that make sense? :)

CBM2 Basic V4.0 Tokens
----------------------

// 0x80 - 0xcb  common CBM Basic Keywords

 128 end
 129 for

 130 next
 131 data
 132 input#
 133 input
 134 dim
 135 read
 136 let
 137 goto
 138 run
 139 if

 140 restore
 141 gosub
 142 return
 143 rem
 144 stop
 145 on
 146 wait
 147 load
 148 save
 149 verify

 150 def
 151 poke
 152 print#
 153 print
 154 cont
 155 list
 156 clr
 157 cmd
 158 sys
 159 open

 160 close
 161 get
 162 new
 163 tab(
 164 to
 165 fn
 166 spc(
 167 then
 168 not
 169 step

 170 +
 171 -
 172 *
 173 /
 174 ^
 175 and
 176 or
 177 >
 178 =
 179 <

 180 sgn
 181 int
 182 abs
 183 usr
 184 fre
 185 pos
 186 sqr
 187 rnd
 188 log
 189 exp

 190 cos
 191 sin
 192 tan
 193 atn
 194 peek
 195 len
 196 str$
 197 val
 198 asc
 199 chr$

 200 left$
 201 right$
 202 mid$
 203 go

----------------------------------------------------------------------------
// 0xcc - 0xde, same as 4.0 (PET)

 204 concat
 205 dopen
 206 dclose
 207 record
 208 header
 209 collect

 210 backup
 211 copy
 212 append
 213 dsave
 214 dload
 215 catalog
 216 rename
 217 scratch
 218 directory
 219 dclear

 220 bank
 221 bload
 222 bsave

 ----------------------------------------------------------------------------
// 0xdf - 0xe8 4.0 CBM2 extra

 223 key
 224 delete
 225 else
 226 trap
 227 resume
 228 dispose
 229 pudef

 230 using
 231 err$
 232 instr

 ----------------------------------------------------------------------------
 255 PI sign

[Vladimir Lidovski]

It seems that the extra keywords for the CBM II start from the position 219 (DCLEAR, $db). I am also unsure about ancient Basic v1.0... It is about the common CBM Basic keywords.

[gpz]

and here is a patch, completely untested :)

[Vladimir Lidovski]

Have you checked my previous post?

[gpz]

I'll check against xpet now... the existing comments seem to be slightly inaccurate then :)

can you test the patch?

[Vladimir Lidovski]

How? I can only repeat that
"dclear", "bank", "bload", "bsave"
are not part of the xpet Basic v4.0.

[gpz]

Yes you are right, i just wanted to confirm it for myself :)

And now... i'd like to see this supposed "Basic v4" for the C64 too, so i really do the right thing ....

[gpz]

check r46151 please

[Vladimir Lidovski]

It seems to work, but I haven't carried out thorough testing.
Thank you.

[Vladimir Lidovski]

Let me add one more suggestion. In my opinion, it would be better to use '{pi}' rather than the tilde sign in the output for the -k option.