Tests

For CPU-specific or primarily CPU-oriented tests, visit the Z80 Wiki. The full collection of ZX Spectrum tests can be downloaded from here:

ZX Spectrum - Tests (2025-07-19).7z (20.9 MiB).
ZX Spectrum - Tests (2025-07-19).zip (31.9 MiB).

Emoji	Meaning
⭐	Recommended minimal set
🚦	Memory and I/O contention
🚌	Floating bus
☃️	Snow effect
🔲	NMOS/CMOS differences
🕹️	Input
📺	Video artifacts
🔉	Sound
	GitHub repo or Gist link
🌍	Website link

• +2A/+3 Floating Bus Test^+2A/+3 🚌
• +2A/+3 Paging Tests^+2A/+3
• +2A/+3 Screen Switch Test^+2A/+3
• 48K NEC Contention Test Suite^48K ⭐ 🚦
• Aline🌍
• AMP16K 🔉
• AY and CPU Detection
• AY Detection🌍
• AY Undocumented Test
• AY/YM Test^128K
• AYtest 🔉
• BASIC Border^48K
• BBG🌍
• Border Time
• Border Test 2020
• Bright Miner 📺
• Contention 🚦
• Crap1^48K
• Currah uSpeech Tests
• DiagROM🌍
• DRAMfade
• Errors🌍
• EX^48K
• FE Delay
• Float+3^+2A/+3 🚌
• Float128K^128K 🚌
• Float48K^48K 🚌
• FloatFFD^128K 🚌
• Floating Spy ⭐ 🚌
• FPGA48 🔲
• FPGA128
• Frame^48K
• Frame Test
• Fuse Test
• IM0-2^48K 🚌
• InFF
• INT Tester
• Interrupt Retriggering Test
• IO Contend 🚦
• IR Contention^48K 🚦 ☃️ 🔲
• IR Contention 128^128K/+2 🚦 ☃️
• Issue 2 Test^48K
• Issue 2-3^48K
• Issue 2-3 (BASIC)^48K
• Keyboard 🕹️ 🌍
• KeyJoyTest 🕹️
• Keyview
• Latency
• ld-bytes-emu-tests for ZX Spectrum 48 emulators
• LDIR-LDDR^48K 🚦
• MCTest2
• MemTest+3⁺³
• Micromira Electrónica^48K
• Minfo
• Multicolor
• Non-Standard Tape Test
• OTIR-OTDR^48K 🚦
• Out48K^48K
• Out7FFC^128K
• OUTI Time^128K
• Pattern^128K
• Port Demonstration 🕹️
• Prefixes
• Quick & Dirty Benchmark
• ROM Boundary Test
• RST 38h
• Screen Time
• Scroll2017^128K 🔲
• SD Exerciser
• Snap Test
• Snow ☃️
• Snow Contention ☃️
• Snow Hold ☃️
• Snow R ☃️
• Snow Tests ☃️
• Snow48 ☃️
• Snow128N^128K ☃️
• Sound Test 🔉
• Speaker 2 EAR Test
• Speed Test^128K
• Tact Meter
• Tape Edge
• Tape Test
• Test de Detección de Emulador
• Test INT
• Test of Screen Switching Timings^128K
• Test SAA 🔉
• Test Takts of INT
• Test ULAs
• Time to First INT
• Timing Test ⭐ 🚦
• TSTP3🌍
• TZX Test Files
• ULA 128 Timing Test^128K ⭐ 🚦 🔲
• ULA 128E +3 Test^+2A/+3 ⭐ 🚦 🔲
• ULA 48 Simple Test^48K ⭐ 🚦 🔲
• ULA Snow Crash ☃️
• ULA Test 2🌍
• ULA Test 3🌍
• ULA Test 3 All
• ULA Test 3 Modified🌍
• ULA vs SJS 🕹️
• Z80 Speed
• Z80 Test Program ⭐
• ZX FPS Counter
• ZX Input Lag Test
• ZX Spectrum Diagnostics
• ZX Spectrum Keyboard Tester 🕹️ 🌍
• ZX Spectrum Timing Tests - 48K^48K ⭐ 🚦 🚌 🌍
• ZX Spectrum Timing Tests - 128K^128K ⭐ 🚦 🌍
• ZX-Uno PS/2 Keyboard Test 🕹️
• ZXTests

The following test programs do not work. They are prototypes and are only included in the wiki for historical and preservation reasons:

• Snow Spy ☃️