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| author | Miquel Sabaté Solà <mssola@mssola.com> | 2025-09-19 07:57:48 +0200 |
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| committer | Miquel Sabaté Solà <mssola@mssola.com> | 2025-09-19 07:57:48 +0200 |
| commit | c0422cf048c1305ec75ddcfd68b81afb8ec5b3f6 (patch) | |
| tree | 2d4ce0ee3b24bba753006bcf2c9c1e30bd5aecaf /crates | |
| parent | 1b18c250d57e29fd318058bd2356b626e4cc1c47 (diff) | |
| download | tools.nes-c0422cf048c1305ec75ddcfd68b81afb8ec5b3f6.tar.gz tools.nes-c0422cf048c1305ec75ddcfd68b81afb8ec5b3f6.zip | |
nasm: Better wording on the README file
Instead of only bringing up the pedantic nature of nasm, also note on
some of its improvements over ca65.
Also, some minor grammar fixes here and there.
Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
Diffstat (limited to 'crates')
| -rw-r--r-- | crates/nasm/README.md | 24 |
1 files changed, 19 insertions, 5 deletions
diff --git a/crates/nasm/README.md b/crates/nasm/README.md index 4b4cf50..bc58232 100644 --- a/crates/nasm/README.md +++ b/crates/nasm/README.md @@ -40,6 +40,20 @@ it will also print a warning telling the programmer about this, as this might be unexpected at first. Hence, as a general rule `nasm` will be more noisy than `ca65`, in the hope that the programmer is more aware about the end result. +That being said, `nasm` is at the same time more flexible than `ca65`. For +exemple, the order of declaration for variables, proc's, etc. is not +important. Hence, the following code is valid in `nasm`, but not in `ca65`: + +```asm +.proc foo + ;; 'ca65' will complain that 'Variable' is not known. + lda #Variable + rts +.endproc + +Variable = $00 +``` + ## Mappers By default `nasm` will assume the configuration for an `NROM` mapper, but this @@ -102,8 +116,8 @@ zp_buffer = $20 ; asan:reserve $0F ``` Then the address sanitizer will assume that `zp_buffer = $20..$2F -(included)`. Any access to this reserved range will be considered a -conflict. For example: +(included)`. Any access to this reserved range that is not strictly via +`zp_buffer` will be considered a conflict. For example: ```asm zp_buffer = $20 ; asan:reserve $0F @@ -166,6 +180,6 @@ In NES/Famicom programs you have to advertise on the header whether Working RAM is being used or not (see [byte 6 on the iNES format](https://www.nesdev.org/wiki/INES)). The programmer is expected to set this flag on if PRG RAM is available. If there are memory accesses to PRG RAM -but the programmer did not advertise that on the header flag, then the `nasm` -will error out as it cannot assume that these accesses are valid. This check -will happen regardless of the `-a/--asan` flag. +but the programmer did not advertise that on the header flag, then `nasm` will +error out as it cannot assume that these accesses are valid. This check will +happen regardless of the `-a/--asan` flag. |