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 (2026-10-07).7z (21.1 MiB).
ZX Spectrum - Tests (2026-10-07).zip (32.3 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   ☃️