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DEC: System Building Block
model number 4509 stamped on front
level standardizer 1502A written on circuit board end
serial number 0137536 stamped on side
level standardizer 1502A written on circuit board end
serial number 0137536 stamped on side
DEC: System Building Block mounting backplane and enclosure
large aluminum (painted) rectangular mounting box for System Building Blocks. Painted speckled tan/brown. 'DEC Building Blocks' marked on back along with 'Digital Equipment Corporation' and 'Maynard Massachusetts' (no other nomenclature).
DEC: System Building Block - Flip Flop
System Building Block in enclosure
Flip-Flop 3201 marked on front
circuit board marked FF 3201-J Pat. Pend.
'Digital Equipment Corporation Maynard Massachusetts' marked on back.
Flip-Flop 3201 marked on front
circuit board marked FF 3201-J Pat. Pend.
'Digital Equipment Corporation Maynard Massachusetts' marked on back.
DEC: System Building Block - Flip Flop
System Building Block in enclosure
Flip-Flop 3201 marked on front; number stamped '13006' front top.
circuit board marked FF 3201-E 00644
'Digital Equipment Corporation Maynard Massachusetts' marked on back.
Flip-Flop 3201 marked on front; number stamped '13006' front top.
circuit board marked FF 3201-E 00644
'Digital Equipment Corporation Maynard Massachusetts' marked on back.
DEC: System Building Block - Inverter
System Building Block in enclosure
Inverter 3101 marked on front; number stamped '21236' front top.
'Digital Equipment Corporation Maynard Massachusetts' marked on back.
Inverter 3101 marked on front; number stamped '21236' front top.
'Digital Equipment Corporation Maynard Massachusetts' marked on back.
DEC: System Building Block - Flip Flop
System Building Block in enclosure. Flip-Flop 3201 marked on front; number stamped '15863' front top, label applied to front marked 'C'.
'Digital Equipment Corporation Maynard Massachusetts' marked on back.
'Digital Equipment Corporation Maynard Massachusetts' marked on back.
DEC: System Building Block - Pulse Generator
System Building Block in enclosure. Pulse Generator 3410 marked on front; number stamped '18418' front top.
'Digital Equipment Corporation Maynard Massachusetts' marked on back.
'Digital Equipment Corporation Maynard Massachusetts' marked on back.
DEC: System Building Block - backplane
Bare backplane for connection of System Building Blocks including power connectors. Label applied to back reads '901 Model 2/26/61'. Sticker applied to front reads 'O.K. Inspected by (DLC in pen) Date: (9/12/61 in pen) Digital Equipment…
DEC: Flip Chip - NAND Gate R121
Circuit board with small handle. ' NAND Gate R121A' and 'I 67' marked on board; 'R121' marked on handle.
'Digital Equipment Corporation Maynard Massachusetts' marked on insertion handle edge.
'Digital Equipment Corporation Maynard Massachusetts' marked on insertion handle edge.
DEC: Maintenance board W130B
Circuit board with extended connector
''Maint. BD-1 W130B' marked on board
''Maint. BD-1 W130B' marked on board
DEC: Maintenance board 2 W131C
Circuit board with clear poly covering indicator lights and 4 switches.
''Maintenance Board 2 W131C' marked on board
''Maintenance Board 2 W131C' marked on board
DEC: Flip-Chip Control Board A1
Circuit board.
'Flip-Chip' and 'Control Board A1' marked on board along with the following groups of markings: '5009263E', '5409264', 'CS *' and the letter series of A-Z; and 'ATC2131580E'.
'Flip-Chip' and 'Control Board A1' marked on board along with the following groups of markings: '5009263E', '5409264', 'CS *' and the letter series of A-Z; and 'ATC2131580E'.
DEC: circuit board with prototype chips and EPROM extension
Circuit board with EPROM chip insertion extension at end.
Two chips center-marked with 'PROTO'.
End of board marked with '50-21531-01 A1' and 'OCt-10 94V-0' and '29591'.
extensive modification to circuitry has been performed in the form of added…
Two chips center-marked with 'PROTO'.
End of board marked with '50-21531-01 A1' and 'OCt-10 94V-0' and '29591'.
extensive modification to circuitry has been performed in the form of added…
DEC: circuit board with prototype chips
Circuit board.
Two chips center-marked with 'PROTO'.
End of board marked with '50-21531-01 A1' and 'OCT-10 94V-0' and '29591'.
Extensive dust covering back from use.
Two chips center-marked with 'PROTO'.
End of board marked with '50-21531-01 A1' and 'OCT-10 94V-0' and '29591'.
Extensive dust covering back from use.
DEC: wired core memory 32K stack board
Large circuit board with additional board attached (screws removed, hinge attached).
Has 6 back plane connectors, two locking insertion handles, and 4 ribbon cable connectors.
Board marked 'Side 2 32K Stack Board' and '5011643B' and…
Has 6 back plane connectors, two locking insertion handles, and 4 ribbon cable connectors.
Board marked 'Side 2 32K Stack Board' and '5011643B' and…
DEC: LPWR circuit board, modified as wall clock
Large circuit board modified to be a wall clock (cut out and modified with addition of a small quartz clock movement).
Board marked 'LPWR' and 'GS-2' and 'digital' logo, along with other various designations.
4 back plane connectors and two locking…
Board marked 'LPWR' and 'GS-2' and 'digital' logo, along with other various designations.
4 back plane connectors and two locking…
DEC: serial bus port module circuit board M7127
Large circuit board with 4 plastic insertion handles, one marked 'M7127'. 4 back plane connectors.
Edge of board marked with side designations (Side 1 and Side 2), with additional markings including: 'Serial Bus Port Module' and 'M7127', along…
Edge of board marked with side designations (Side 1 and Side 2), with additional markings including: 'Serial Bus Port Module' and 'M7127', along…
DEC: LPWR circuit board M7135
Large circuit board
Board marked 'LPWR' and 'Diceon' and '94-0',
'M7135' and '5015381-01-C1' along with other various designations.
4 back plane connectors and two metal locking insertion handles.
Board marked 'LPWR' and 'Diceon' and '94-0',
'M7135' and '5015381-01-C1' along with other various designations.
4 back plane connectors and two metal locking insertion handles.
DEC: LPWR 4 MB memory board M7551
Large circuit board with 2 locking metal insertion handles,. 4 back plane connectors.
Edge of board includes various markings, including: '4MB Q22 MOS MEM PAR' and 'M7127', and
'5017547-01-C1-P2' and 'M7551-CA'.
'LPWR' followed by the 'digital'…
Edge of board includes various markings, including: '4MB Q22 MOS MEM PAR' and 'M7127', and
'5017547-01-C1-P2' and 'M7551-CA'.
'LPWR' followed by the 'digital'…