Vixen motherboard for Vic20 by Stonechip Electronics

The Vixen has 4 slots for use with VIC 20 compatible cartridges and one socket for 24 pin EPROMS. Cartridges may be inserted in any position. The Power Supply (+5) to socket 3 and socket 4 may be switched off independently allowing cartridges to remain in the VIXEN motherboard though not required. The block 1 and block 3 select lines from the computer may be reversed on socket 4 (see note C). The EPROM socket is wired to accept a 2732 device and addresses in block 5 (A000-AFFF).