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A known example for a perfectly working monitor is the BENQ 702A. More examples can be found on the internet (see links below), but be aware, although the [https://pinoutguide.com/Video/VGAVesaDdc_pinout.shtml VGA standard should accept Csync on pin 13], some monitors expect separate v-sync and h-sync signals. In those cases, [https://www.cpcwiki.eu/forum/hardware-related/cpc2vga/msg235888/#msg235888 an adapter, that splits c-sync into h-sync and v-sync ] would be required.