Modern methods
I can provide the specific schematic, pinout, or ROM file name for your exact situation. Share public link
While this video focuses on upgrades, it shows how a functioning system should perform. 3. How to Test Your ZX Spectrum Hardware (Step-by-Step)
The definitive archive for original Sinclair utility tapes and official diagnostic software. zx spectrum test program link
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Comprehensive RAM tests, ROM checksum verification, ULA functionality, keyboard and joystick diagnostics, Z80 CPU type detection (NMOS/CMOS), and ZX Printer support.
Insert the device into the Spectrum’s rear expansion edge connector while the power is off. Modern methods I can provide the specific schematic,
If you're looking for a specific test program link, please provide more information or context about what you're trying to achieve or the error message you're encountering. I'll do my best to help!
This is widely available on World of Spectrum (WoS) . Look in the "Utilities" section or search the archive for "Service Test." 3. Brendan Alford’s ZX Diag
for programming diagnostic tools directly into flash memory. Where to Download or Purchase How to Test Your ZX Spectrum Hardware (Step-by-Step)
: Checking the functionality of the "dead-flesh" rubber keyboard and attached peripherals like joysticks.
Some examples of test programs for the ZX Spectrum include:
Requires an external ROM cartridge emulator (like a D尘and, DivMMC, or Interface 1bis) or burning the binary file to an EEPROM chip to replace the physical internal ROM.
1. The Industry Standard: Retroleum’s SMART Card and Diagnostics
An unpublished ROM used by engineers for hardware verification. It occupies only 8KB and is a common target for those looking for the "original" diagnostic feel. Sinclair Test Program (1985):