Glass Z80 assembler | MSX Resource Center (Страница 18/21)

Paragon (1831)

27-07-2020, 23:01

Ok! makes sense!

About the colons, I agree, also, without the colons, since macros could potentially start without indentation, there could also be inconsistencies depending on the name you give to your macros. So, I like to add colons in all the labels too. Even when they have an equ.

By Grauw

Ascended (10821)

11-02-2022, 22:05

santiontanon wrote:

end: jr end  ; Glass does not like "end" as a label, so this does not compile

I am confused about why can't we use "end" as a label, since "end" is not any of the reserved keywords in Glass (like "endm" or "ends"), right?

Hey Santi, I fixed this issue.

The problem was that the global scope should be the parent of the scope of the top level source file, however it was incorrectly defined as its direct scope. So this caused a label redefinition error (and not just for end).

(I also documented the end directive, it’s been supported since the very first release.)

By Grauw

Ascended (10821)

11-02-2022, 22:16

Would anyone be bothered if I changed the source file encoding from ISO-8859-1 (Latin-1) to UTF-8?

I think no-one should be impacted by this; I don’t expect anyone to be using non-ASCII characters in strings, since no Z80 platform uses the ISO-8859-1 character encoding anyway. And for comments the file encoding does not really matter either way.

By santiontanon

Paragon (1831)

12-02-2022, 05:32

Oh, nice! Thanks for the fix! I'll update MDL's support for Glass in the next release to account for this! As for the encoding, UTF-8 sounds good to me too. The only place where I do see non ASCII characters some times in assembler codebases is in the comments (accents, etc. for Spanish/French/Brazilian code). But since comments do not affect the binary, I think this should be fine

By SjaaQ

Champion (381)

12-02-2022, 11:19

Grauw wrote:

Would anyone be bothered if I changed the source file encoding from ISO-8859-1 (Latin-1) to UTF-8?

I think no-one should be impacted by this; I don’t expect anyone to be using non-ASCII characters in strings, since no Z80 platform uses the ISO-8859-1 character encoding anyway. And for comments the file encoding does not really matter either way.

No, not really.

By Wlcracks

Hero (572)

12-02-2022, 11:19

Cool Glass updates

By Grauw

Ascended (10821)

06-03-2022, 04:47

santiontanon wrote:

Grauw wrote:

santiontanon wrote:

I Grauw, just for fun, I was trying to compile some of the players that come with Arkos Tracker ( http://www.julien-nevo.com/arkostracker/ ), and they use an undocumented instruction of the Z80 which I think might not be supported by Glass. Specifically, the Arkos player uses:

  out (c),0

Which is undocumented ( http://z80-heaven.wikidot.com/instructions-set:out ). When I try to compile with Glass, it complains about invalid arguments. Looking at the code in which this is used in the Arkos player, however, I see that this instruction is used to save a few cycles when sending data to the PSG, which is pretty cool :)

Hey Santiontanon, I don’t support that because it doesn’t work on the R800. Same applies to “sll”.

The supported undocumented instructions are the ones involving ixh / ixl, etc., and in (c) (which actually is documented by Zilog… kinda). See the list here.

Of course you can still code the opcode with db, or make a macro for it.

The R800 does not support it?!?! darn it! ok, ok... then I should reconsider the optimizations I had in mind... but in any case, even if the R800 does not support it, I think having a compiler flag to support it would be good, just for completeness sake :)

To clarify a little bit the situation with “out (c),0” (ED F1 opcode):

This outputs 0 to I/O port C on NMOS Z80 CPUs like the Zilog Z80 and Sharp LH0080.

This outputs 255 to I/O port C on CMOS Z80 CPUs like the Toshiba TMPZ84C00A (in MSX-ENGINE).

So even if you disregard the R800, this undocumented instruction is completely incompatible between different MSX models.

By thegeps

Paragon (1251)

06-03-2022, 12:01

Grauw wrote:

santiontanon wrote:

Grauw wrote:

santiontanon wrote:

I Grauw, just for fun, I was trying to compile some of the players that come with Arkos Tracker ( http://www.julien-nevo.com/arkostracker/ ), and they use an undocumented instruction of the Z80 which I think might not be supported by Glass. Specifically, the Arkos player uses:

  out (c),0