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Sasq
Registered: Apr 2004
Posts: 157 |
Badass - New 6502 Assembler
The last couple of months I've created a new 6502 Assembler called bass (or Badass).
The basic idea is for it to be as advanced as Kickassembler, but with a less complex, more unified syntax.
And it also has unit tests in an internal emulator.
You can find it at https://github.com/sasq64/bass
I've started a tutorial here: http://apone.org/bass/part1.html
Here is an example C64 source http://apone.org/bass/example.asm.html |
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Frantic
Registered: Mar 2003
Posts: 1661 |
Good work there, sir! I didn't manage to build bass on my MacOS 10.13 system though, due to various errors when compiling. Too bad. |
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Sasq
Registered: Apr 2004
Posts: 157 |
Yes Apples clang still lacks many C++17 features. I'll see what I can do... |
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Boogaloo
Registered: Aug 2019
Posts: 24 |
I'm following this with great interest. I'll try it out soonish. Great work so far!
(And I agree with JackAsser about the clean C++ code.) |
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Sasq
Registered: Apr 2004
Posts: 157 |
OK, removed shared_ptr<T[]> which is not supported by OSX yet it seems, should build now. |
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Sasq
Registered: Apr 2004
Posts: 157 |
@Boogaloo Thanks! |
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Sasq
Registered: Apr 2004
Posts: 157 |
Here is an example of indexed labels and unit testing, based
on a snippet from Trash that wanted this feature;
; constant D011VALUE == value in d011
D011VALUE = 0
!macro DrawRasterColors(row) {
!if (row & 7) == (D011VALUE & 7) {
; 23 cycle macro
col[row]:
lda #0 ; 2
sta $d020 ; 6
sta $d021 ; 10
!rept 5 { nop }
bit $ea ; 23
} else {
;63 cycle macro
col[row]:
lda #0 ; 2
sta $d020 ; 6
sta $d021 ; 10
!rept 25 { nop }
bit $ea ; 63
}
}
!section "main", $c000
!rept 6*8 {
DrawRasterColors(i + $40)
}
!test "bad" {
DrawRasterColors(0)
}
!assert tests.bad.cycles == 23
!test "good" {
DrawRasterColors(1)
}
!assert tests.good.cycles == 63
!test "modify" {
lda #9
sta col[$40]+1
lda #8
sta col[$41]+1
}
!assert tests.modify.ram[$c001] == 9
!assert tests.modify.ram[$c010] == 8
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Oswald
Registered: Apr 2002
Posts: 5127 |
indexed labels is nice, lot of guys need that when creating selfmodded speedcode with macros :) |
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Raistlin
Registered: Mar 2007
Posts: 771 |
I was interested in trying out this assembler .. but .. trying to compile the source, I'm getting some problems..
On Windows, CMake is refusing to generate the compile_commands.json file ....
Anyone know what might be needed to get this compiling on Windows? |
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Sasq
Registered: Apr 2004
Posts: 157 |
`compile_commands.json` are not needed for building, only for Intellisense features in editors such as Visual Studio Code. |
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Sasq
Registered: Apr 2004
Posts: 157 |
The `dev` branch is where it's happening BTW.
The following is an example on how you can let the assembler "pre-render" sid register data for faster playback (like the Dane part in Edge of Disgrace):
!script "../lua/sid.lua"
data = load("../data/test.sid")
sid = sid_parse(data)
!section "music", sid.load
music:
!fill sid.data
%{
sid_data = nil
function generate_data()
map_bank_write(0xd4, 1, function(adr, val)
if sid_data then
table.insert(sid_data, adr - 0xd400)
table.insert(sid_data, val)
end
end)
start_run()
init = sym("sid.init")
play = sym("sid.play")
set_a(0)
call(init)
sid_data[#sid_data - 1] = sid_data[#sid_data - 1] | 0x80
for i=1,15*50 do
l = #sid_data
call(play)
if l ~= #sid_data then
sid_data[#sid_data - 1] = sid_data[#sid_data - 1] | 0x80
else
print("Silent frame")
end
end
end
function get_sid_data()
sid_data = {}
generate_data()
result = sid_data
sid_data = nil
return result
end
}%
!text "SID"
sid_data:
!fill get_sid_data()
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