Reply PowerBoard 50/70

ref367.exe Turbo/Power Boards 3.67 Reference Disk (zipped image)
117-pb.exe PowerBoard BIOS v1.17 Flash - Model 50/55/70

Reply PowerBoard 50/70

F1 PTC Fuse (KB/mouse 5 V)
J1 HDD15 video connector
J2 DB25 serial port
J3 Parallel port
J4 Mouse port
J5 Keyboard port
J6 Outline, 2 pin. Unk
J7 Outline, 3 pin. Unk
J8 Outline, 2 pin. Unk
J11 CPU Speed Jumper?
J12 Speaker connector
J13 Outline, 2 pin. Unk
J14 Clear CMOS Jumper?
J15 40-pin IDE connector
J16 Pads for 2-pin Fan power header
J17,18 Three pin drive power
P1 16-bit MCA slot w/AVE
P2,3 32-bit MCA slot w/MME
P4 Drive riser
P5A Power supply edge connector
U1,4 MT4C16257DJ-7 256Kx16 DRAM (video)
U5,12 SOJ sockets for 256x16 DRAM
U13 Cirrus CL-GD5434
U21 10G4672 I/O controller
U23 PCB w/ xtal?
U28 Dallas DS1387 RTC+NVRAM
U29,35,42 Flash chips, Unknown
U31 L2 Cache Socket
U40 pads for QFP (486SX?)
U43 71G0438 "System Controller"
U60,62,65 72-pin SIMM sockets
U63 Socket 3 (5V only)
U68 Appian ADI/2 IDE controller
U69 NEC 82078-1 B Floppy controller
Q3 Linear LT1085 adjustable reg.
Y1 14.31818 MHz xtal

J11 CPU Speed Jumper? - ON: 25/50/75 MHz, OFF: 33/66/100 MHz. (No indication on the PCB, but it should be the same as J15 on M80 P/B.)
J14 Clear CMOS Jumper? - CMOS configuration is cleared by switching the jumper from one position to the other. The jumper remains in its new position until the next time you decide to clear CMOS.

The board doesn't have a VGA Enable/Disable jumper (quite reasonable since it has only 3 MCA slots).

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