33 lines
955 B
Go
33 lines
955 B
Go
package z80
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import "testing"
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func TestR_Increments_On_ED_Neg(t *testing.T) {
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cpu, mem, _ := testCPU()
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loadProgram(cpu, mem, 0x0000, 0xED, 0x44) // NEG
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cpu.R = 0
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r0 := cpu.R & 0x7F
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mustStep(t, cpu)
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r1 := cpu.R & 0x7F
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// Expect 2 M1s: ED fetch after the initial opcode fetch
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inc := int((r1 - r0) & 0x7F)
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if inc != 2 {
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t.Fatalf("R should increment by 2 for ED-prefixed single op, got %d", inc)
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}
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}
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func TestR_Increments_On_DD_DD_Nop(t *testing.T) {
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cpu, mem, _ := testCPU()
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// DD DD <anything> -- our executeDD returns 4 for a second DD as NOP;
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// we only execute one Step here: first DD, then post-prefix M1 fetches second DD, then stop.
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loadProgram(cpu, mem, 0x0000, 0xDD, 0xDD)
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cpu.R = 0
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r0 := cpu.R & 0x7F
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mustStep(t, cpu)
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r1 := cpu.R & 0x7F
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// Should see 2 M1 increments (first DD fetch + second DD as post-prefix fetch)
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if int((r1-r0)&0x7F) != 2 {
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t.Fatalf("R should increment by 2 on DD DD, got %d", int((r1-r0)&0x7F))
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}
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}
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