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65816.js
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added more unit tests for LDA and fixed a bug in the implemention of the direct page indirect mode for LDA

This commit is contained in:
Preston Skupinski 2011-08-31 15:40:44 -04:00
parent a8f5cc4556
commit fadcea4c5d
2 changed files with 26 additions and 2 deletions
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2
cpu.js
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@ -4722,7 +4722,7 @@ var LDA_direct_page_indirect = {
} else {
var low_byte_loc = cpu.mmu.read_byte(location);
var high_byte_loc = cpu.mmu.read_byte(location+1);
var absolute_location = high_byte_loc | low_byte_loc;
var absolute_location = (high_byte_loc<<8) | low_byte_loc;
var low_byte = cpu.mmu.read_byte(absolute_location);
var high_byte = cpu.mmu.read_byte(absolute_location+1);
cpu.r.a = (high_byte<<8) | low_byte;

26
test/tests.js
View File

@ -126,10 +126,34 @@ function test_lda() {
"$ff after $fd is indexed with the x register("+
"which is 1) in 16-bit memory/accumulator mode.");
equals(cpu.p.m, 0, "m flag of the p status register should be 0 for "+
"16-bit memory/accumulator mdoe.");
"16-bit memory/accumulator mode.");
equals(cpu.p.e, 0, "Hidden e flag of the p status register should be 0 "+
"for native mode.");
});
test("Make sure LDA indirect given a direct page address loads an 8-bit "+
"value in 8-bit memory/accumulator mode.", function() {
var cpu = new CPU_65816();
cpu.execute("18fba9ff85fea90a85ffa9068dff0aa900b2fe");
equals(cpu.r.a, 6, "The accumulator should be 6 when LDA loads an 8-bit "+
"value using an indirect address in 8-bit mode "+
"memory/accumulator mode.");
equals(cpu.p.m, 1, "m flag of the p status register should be 1 for "+
"8-bit memory/accumulator mode.");
equals(cpu.p.e, 0, "Hidden e flag of the p status register should be 0 "+
"for native mode.");
});
test("Make sure LDA indirect given a direct page address loads a 16-bit "+
"value in 16-bit memory/accumulator mode.", function() {
var cpu = new CPU_65816();
cpu.execute("18fbc220a9ff0a85fea9ffff8dff0aa90000b2fe");
equals(cpu.r.a, 0xffff, "The accumulator should be 0xffff when LDA loads "+
"a 16-bit value using an indirect address "+
"loaded from a direct page address.");
equals(cpu.p.m, 0, "m flag of the p status register should be 0 for "+
"16-bit memory/accumulator mode.");
equals(cpu.p.e, 0, "Hidden e flag of the p status register should be 0 "+
"for native mode.");
});
}
function test_emulation_mode() {