The R and S series FLIP-CHIP boards were
original PDP-8 introduced in 1965 and peripherals. The R series was also
sold as building blocks for custom hardware. They replaced the original
product of Digital Equipment Corporation (DEC) which was the
System Modules. The system modules were used to make the
which was the predecessor of the PDP-8.
The R series boards were replaced by the M series logic using standard TTL logic IC's when
IC's became common and affordable.
The M series board were first listed in the 1968 logic handbook and
used in the PDP-8/I introduced in 1968.
The S series boards are identical to the R series boards except faster
transistors and lower value load resistors. This gave them higher speed and
More R/S series information.
The R and S series boards have Red handles.
R Series Features:
The following picture links also have descriptions of what is shown in the pictures.
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Discrete transistor logic boards. All these board are made from discrete transistor and diodes, no IC's
Gates and Registers/Flip Flops
R002 Diode Network ( 19K) back of board ( 20K)
R107 Inverter ( 29K) back of board ( 38K)
R111 Expandable NAND/NOR gate ( 24K) back of board ( 33K)
R113 NAND/NOR Gate ( 28K) back of board ( 37K)
R123 Input Bus Gate ( 27K) back of board ( 33K)
R151 Binary to Octal Decoder ( 52K) back of board ( 54K)
R181 DC Carry Chain ( 40K) back of board ( 46K)
R202 Dual Flip Flop ( 32K) back of board ( 44K)
R203 Triple Flip Flop ( 34K) back of board ( 47K)
R205 Dual Flip Flop ( 36K) back of board ( 45K)
Delays, Multivibrators and Oscillators
R302 Dual Delay (One Shot) ( 35K) back of board ( 47K)
R303 Integrating One Shot ( 31K) back of board ( 42K)
R401 Rev D Variable Clock ( 28K) back of board ( 35K) R401 Rev H Variable Clock ( 28K) back of board ( 40K)
R405 Crystal Clock ( 31K) back of board ( 36K)
R602 Dual Pulse Amplifier ( 31K) back of board ( 44K)
R603 Triple Pulse Amplifier ( 32K) back of board ( 45K)