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SPONZY uses WRX for display, so you need a WRX-compatible (e.g. SRAM) memory in 16K-32K region.
Readed topic "ROM's again" I think your ROM-bank can switch by 8K only.
Discussion forums for users of the Sinclair 8-bit range of computers - ZX80, ZX81, ZX Spectrum, Z88, clones...
About the ZX80 / ZX81