Zx Spectrum Test Program May 2026

ld hl, 32768 ; start of 32K RAM area (for 48K) ld de, 32769 ld bc, 32768-1 ld (hl), $FF ldir ; fill with $FF ; ... then verify and repeat with $00, $AA, $55

#ZXSpectrum #RetroComputing #Z80 #Diagnostics #Homebrew zx spectrum test program

ZX TEST v1.0 ROM CHK: PASS RAM 48K: PASS KB TEST: Press any key... I’ve put the .tap file and source on GitHub → [link] ld hl, 32768 ; start of 32K RAM

Should I add a ULA snow test or an AY-3-8910 sound check next? Anyone else have a favourite minimal test routine? 32769 ld bc