#209 Spec SE 64 Colour Mode

[Gilberto Almeida]

- Initial patch to add a 64 colour mode to Spec SE, according tothis specification: http://scratchpad.wikia.com/wiki/ZX_Spectrum_64_Colour_Mode
+ Added a 64 byte CLUT
+ Added a couple of I/O ports to read/write the CLUT values and enable/disable the 64 colour mode.

[Gilberto Almeida]

Spec SE 64 Colour Mode

[Philip Kendall]

Technically, I don't see anything wrong with this, but the coding style needs work. See hacking/coding_style.txt for some of this, but largely it's a case of following what the rest of the source does.

* Inconsistent use of spaces (eg se_clut_curr_reg = 0 vs se_clut_palette_change=0; other examples exist)
* The clut_* functions should be static unless they're being called from elsewhere
* All parameter in prototypes should have names
* All hex constants should be in lower case (0xffff vs 0xBF3B)
* No leading asterisk on continuations of comment lines
* In a function definition, the name should start on a new line
* 2 character indents
* The opening brace of a function definition should be on a new line
* No parentheses around simple return statements
* if( condition ), not if(condition)
* Spaces around condition operators: se_clut_curr_reg >= 0, not se_clut_curr_reg>=0

Other bits:

* There's no point having >= 0 checks on unsigned variables. That's always true.
* Missing else in clut_dataport_read
* You should probably be checking in clut_dataport_write that the value has actually changed before setting se_clut_palette_change.

[Gilberto Almeida]

Spec SE 64 Colour Mode, reworked

[Gilberto Almeida]

Thank you for the feedback, Phillip.
I reworked the patch to address the issues you pointed out.
I think this version is more in line with the project's coding style.