Leningrad-1 board manufactured in 1991

Hello, y-dmitry Today I received the board for the first version of Leningradka. Interesting option, earlier I haven't met. Can anyone comment (how the boards differ, Are the bugs fixed, build features) I will be grateful to everyone. File: Payment1.rar http://zx.pk.ru/attachment.php?attachmentid=2878 File: Payment2.rar http://zx.pk.ru/attachment.php?attachmentid=2879