Comments (7)
I've been thinking about porting Microsoft Basic, but it looks complex --- ASM.COM has some bugs and missing features I'd need to implement. The one you linked is rather simpler. Where did it come from? It's clearly a 6502 CP/M port, so I'm guessing either DOS65 or DOS/65 (these are different projects)?
I can't use it as it stands because it has no license, which is why I need to know...
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I got it from here: https://github.com/Dietrich-L/CPM-65/tree/main/BASIC
But, as seen in the source code, it is much earlier, written by another author.
Dietrich has his own port of CP/M-65, initially to only one platform. Some time ago I gave him an idea to port it to Apple II. Meanwhile you also ported your version to Apple II. Actually, it works on Apple II also (not only //e, but prints only the odd symbols, others are sent to non-existing 80-column card. Not sure if it will work with Videx in slot 0.
from cpm65.
I completely forgot about your message! And then went and ported Altirra BASIC, which is an Atari BASIC clone and significantly more work than porting this would have been... but at least there's a BASIC now, even if it's not very Microsoft compatible.
from cpm65.
Unfortunately, looking at Dietrich's code in more detail, it's pretty clear that it's not original and is in fact reverse engineered from Microsoft BASIC. e.g.:
From the leaked Microsoft BASIC code:
FRE:
lda VALTYP
beq L3188
jsr FREFAC
L3188:
jsr GARBAG
sec
lda FRETOP
sbc STREND
tay
lda FRETOP+1
sbc STREND+1
From Dietrich's code:
FRE LDA VAR_F ;FRE COMMAND
BEQ FRE1
JSR GARCOL1
FRE1 JSR RM_STR
SEC
LDA STREND
SBC VTEND
TAY
LDA STREND+1
SBC VTEND+1
There are many other similarities. It's even got the "MICROSOFT!" Easter Egg in it. So that renders it unusable, I'm afraid.
from cpm65.
Do you mean that one? https://www.pagetable.com/?p=774
Definitely, there are some similarities, but it could be indirect.
from cpm65.
I doubt it, unfortunately. They look far too similar to be a coincidence. Even the token names are listed in the same order.
from cpm65.
So, I guess you aren't supposed to use the official MS code?
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Related Issues (20)
- VT52 waiting for valid escape sequence HOT 1
- Reusing a static FCB for several file operations HOT 3
- "REN"-like command for changing user ID HOT 2
- Multiple drive support HOT 6
- Older Apple ][ support HOT 5
- Arrow-key constants HOT 2
- cpm.h header file needed HOT 2
- munmap_chunk(): invalid pointer HOT 4
- Suggestion: have the CCP zero out the bss for transient commands
- Thoughts on sound, timer, and joystick drivers HOT 1
- request: o65 6502 binary relocation format
- Cursor behaviour HOT 3
- Writing a new driver in assembly HOT 7
- Dependency on a certain version of llvm-mos HOT 1
- Failing to assemble .COMs on macOS (13.6) HOT 2
- Listing multiple lines in BEdit does not work
- ccp internal "ren" does not work HOT 2
- Build for Apple II 3.5" as well HOT 5
- Saving files with BEDIT on the Atari doesn't work HOT 3
- Updates to lib6502 breaks objdump HOT 1
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