More Russian software use IM2 vector table in slow memory area (16384-32767 and slow mem pages on ZX48/128/+2/+3). This ZX models contain HW bug in HAL10H8 chip and if high adress byte of vector table (register I) is set to this slow (contended) memory, ZX is very unstable and ULA show in screen raining effect. ZX will crash. This problem is possible correct in software by setting register I (IM2 table) to fast memory (or ROM). Exist fixed versions ?
list of raining games:
viking quest 1, 2
wolf demo 3
this games is download from my page: