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first public release

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This commit is contained in:
Viacheslav Kaloshin
2025-09-25 15:29:49 +03:00
parent 6f90fda7a7
commit 24702e4419
41 changed files with 34202 additions and 0 deletions
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52
alu16_flags_test.go Normal file
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package z80
import "testing"
// Verify 16-bit ADD/ADC/SBC HL,rr flags, XY from high byte, and MEMPTR=HL+1
func TestADD_HL_rr_FlagsAndMEMPTR(t *testing.T) {
cpu, mem, _ := testCPU()
cpu.SetHL(0x0FFF)
cpu.SetBC(0x0001)
loadProgram(cpu, mem, 0x0000, 0x09) // ADD HL,BC
mustStep(t, cpu)
assertEq(t, cpu.GetHL(), uint16(0x1000), "ADD HL,BC result")
assertFlag(t, cpu, FLAG_H, true, "H set on carry from bit11")
assertFlag(t, cpu, FLAG_N, false, "N cleared")
assertFlag(t, cpu, FLAG_C, false, "C not set")
// X/Y from high byte of result (0x10 -> both X and Y clear)
assertFlag(t, cpu, FLAG_Y, false, "Y from high byte should be clear for 0x10")
assertFlag(t, cpu, FLAG_X, false, "X from high byte should be clear for 0x10")
assertEq(t, cpu.MEMPTR, uint16(0x1000-0x0001+1), "MEMPTR=oldHL+1")
// ADC HL,DE with carry in
cpu.SetHL(0x7FFF)
cpu.SetDE(0x0000)
cpu.SetFlag(FLAG_C, true)
loadProgram(cpu, mem, cpu.PC, 0xED, 0x5A) // ADC HL,DE
mustStep(t, cpu)
assertEq(t, cpu.GetHL(), uint16(0x8000), "ADC HL,DE result")
assertFlag(t, cpu, FLAG_S, true, "S from result high bit")
assertFlag(t, cpu, FLAG_Z, false, "Z")
assertFlag(t, cpu, FLAG_PV, true, "PV overflow on 7FFF+0+1")
assertFlag(t, cpu, FLAG_C, false, "C")
assertFlag(t, cpu, FLAG_N, false, "N")
assertFlag(t, cpu, FLAG_X, false, "X from high byte 0x80")
assertFlag(t, cpu, FLAG_Y, false, "Y from high byte 0x80")
}
func TestSBC_HL_rr_FlagsAndMEMPTR(t *testing.T) {
cpu, mem, _ := testCPU()
cpu.SetHL(0x8000)
cpu.SP = 0x0001
cpu.SetFlag(FLAG_C, true)
loadProgram(cpu, mem, 0x0000, 0xED, 0x72) // SBC HL,SP
mustStep(t, cpu)
// 0x8000 - 0x0001 - 1 = 0x7FFE
assertEq(t, cpu.GetHL(), uint16(0x7FFE), "SBC HL,SP result")
assertFlag(t, cpu, FLAG_N, true, "N set on subtract")
assertFlag(t, cpu, FLAG_C, false, "No borrow overall")
assertFlag(t, cpu, FLAG_PV, true, "Overflow: negative - positive -> positive")
// XY from high byte 0x7F (both X and Y set)
assertFlag(t, cpu, FLAG_X, true, "X from 0x7F")
assertFlag(t, cpu, FLAG_Y, true, "Y from 0x7F")
}