Reparieren kann man den Chip sicher nicht. Ersatz vermutlich auch nur von Spenderboards.
über das 44801B35 findet man aber einiges:
+ALPHA-8302: "44801B35" -> HD44801, ROM code = B35
+The Alpha-8201/830x isn't a real CPU. It is a Hitachi HD44801 4-bit MCU,
+programmed to interpret an external program using a custom instruction set.
+Alpha-8301 has an expanded instruction set, backwards compatible with Alpha-8201.
+package / pin assign
+ALPHA 8201 DIP 42
+
+pin HD44801 Alpha
+--- ------- -----
+1 : D3 WR
+2-4 : D4-D6 n.c.
+5-7 : D7-D9 GND in shougi , n.c. in champbas
+8-13 : D10-D15 n.c.
+14 : n.c. n.c.
+15 : RESET RESET
+16 : GND GND
+17 : OSC1 (champbas=384KHz)
+18 : OSC2 n.c.
+19 : !HLT Vcc
+20 : !TEST Vcc
+21 : Vcc Vcc
+22-25: R00-R03 DB4-DB7
+26-29: R10-R13 DB0-DB3
+30 : INT0 GO (input)
+31 : INT1 n.c.
+32-35: R20-R23 A4-A7
+36-39: R30-R33 A0-A3
+40-41: D0-D1 A8-A9
+42 : D2 /RD