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PRICE LIST

EFFECTIVE APRIL 1, 1967

The following table is taken from DEC Logic Handbook, 1967 pp393-400
R SERIES
*R001 DIODE NETWORK Seven diodes for adding inputs to gates and flip-flops. $4.00
*R002 DIODE NETWORK Five 2-input diode networks; OR for ground AND for negative signals, when connected to diode-gate node points. $5.00
*R107 INVERTER Seven one-input diode gates. One inverter also has node input. $24.00
*R111 EXPANDABLE NAND/NOR GATE Three 2-input diode-transistor gates. NOR's for ground and NAND's for negative inputs. Node terminal provided for additional inputs. $14.00
R113 NAND/NOR GATE Five 2-input diode transistor gates. NOR's for ground and NAND's for negative inputs. $20.00
*R121 NAND/NOR GATE Four R111-type gates with loads internally connected and without nodes. $17.00
*R122 NOR/NAND GATE Logical complement of R121, but somewhat slower One ma input and 18 ma outputs like R121. $26.00
R123 INPUT BUS GATE Six two-input Ri 11-type gates without loads or nodes. Each gate shares one input with another. $19.00
R131 EXCLUSIVE OR Four gates which perform exclusive OR function. $35.00
*R141 AND/NOR GATE Seven 2-input gates. OR's NAND'ed together for ground inputs; AND's NOR'ed together for negative inputs. $13.00
*R151 OCTAL DECODER One of eight outputs is grounded for each combination of states in three pairs of complementary inputs. $33.00
R181 DC CARRY CHAIN Six cascaded AND gates for counting without carry delay. $35.00
*R200 FLIP-FLOP Two-transistor flip-flop is set or cleared from its own outputs or direct set and clear inputs. Operates at up to 2 megacycles. $9.50
*R201 FLIP-FLOP Flip-Flop with direct set and clear inputs and five diode capacitor-diode gates. Can be set or cleared from its outputs. $22.00
*R202 DUAL FLIP-FLOP Two flip-flops; each with clear input and two diode-capacitor-diode input gates. Can be set or cleared from its outputs. $25.00
*R203 TRIPLE FLIP-FLOP Three flip-flops, each with direct clear input and diode-capacitor-diode gate. Can be set or cleared from it soutputs. $28.00
*R204 QUADRUPLE FLIP-FLOP Four flip-flops, each with direct clear and set inputs. Two flip-flops share each direct-clear input. Can be set or cleared from its outputs. $28.00
*R205 DUAL FLIP-FLOP Two flip-flops with common clear and each having three diode-capacitor-diode gates. Can be set or cleared from its outputs. $29.00
*R302 DELAY Two one-shot multivibrators triggered by capacitor-diode gates. Independent delays controlled internally or externally. $44.00
R303 INTEGRATING ONE SHOT Zero recovery time multivibrator with complementary output buffers. Delays controlled externally or internally. $45.00
*R401 VARIABLE CLOCK   $45.00
**R405 CRYSTAL CLOCK   $100.00
R601 PULSE AMPLIFIER Pulse amplifier and six capacitor-diode input gates. Driven by 40 to 100-nanosecond, positive-going pulses at up to 2 megacycles or 400-nanosecond pulses at up to 1 megacycle. $25.00
R602 PULSE AMPLIFIER Two pulse amplifiers, each with two diode-capacitor-diode gates and one ungated input. Input frequency up to 2megacycles. $22.00

* Normal Delivery off-the-shelf.

**2Mc only off-the-shelf delivery.

- (Page 393) -



R SERIES (Cont.)
*R603 PULSE AMPLIFIER Three pulse amplifiers, each with one diode-capacitor-diode gate and one ungated input. Input frequency up to 2 megacycles. $28.00
*R650 BUS DRIVER Two inverting bus drivers, each with 2-input NOR or NAND diode-transistor gate. Node terminal provided for additional inputs $23.00
W SERIES
*W002 CLAMPED LOAD Fifteen 2-milliampere clamped loads. $13.00
*W005 CLAMPED LOAD Fifteen 5-milliampere clamped loads. $15.00
W018 CONNECTOR MODULE For 18-line, ribbon-cable connections. $18.00
For each foot of cable or fraction: $0.60
W018U CONNECTOR MODULE Without cable. $9.00
W021-R CONNECTOR MODULE For 9 direct ribbon-cable connections: $13.00
For each foot of cable, or fraction: $0.60
W021-RU CONNECTOR MODULE Without cable. $4.00
W021-C CONNECTOR MODULE For 9 direct co-axial connections: $31.00
For each foot of cable, or fraction: $1.50
W021-CU CONNECTOR MODULE Without cable. $4.50
W022-R CONNECTOR MODULE For 9 terminated ribbon connections: $13.50
For each foot of cable, or fraction: $0.60
W022-RU CONNECTOR MODULE Without cable $4.50
W022-C CONNECTOR MODULE For 9 terminated co-ax connections: $33.00
For each foot of cable, or fraction: $1.50
W022-CU CONNECTOR MODULE Without cable. $6.50
W023 CONNECTOR MODULE For 18-line, ribbon-cable connections. $13.00
For each foot of cable or fraction: $0.60
W023U CONNECTOR MODULE Without cable. $4.00
W028-R CONNECTOR MODULE For 9 jumperable ribbon connections: $13.00
For each foot of cable, or fraction: $0.60
W028-RU MODULE CONNECTOR Without cable. $4.00
W028-C MODULE CONNECTOR For 9 jumperable co-ax connections: $31.00
For each foot of cable, or fraction: $1.50
W028-CU CONNECTOR MODULE Without cable. $4.50
*W040 SOLENOID DRIVER Two high-current-drive amplifiers, each with a diode NOR or NAND gate. Node terminal provided for additional inputs. $36.00
W042 10 AMP DRIVER Four germanium transistor drivers which can provide up to 10 amps of DC drive. $80.00
W043 SOLENOID DRIVER Two high-current-drive amplifiers, each with a diode NOR or NAND gate. Node terminal provided for additional inputs. $35.00
*W050 INDICATOR DRIVER Seven amplifiers for miniature, incandescent indicators. $13.00
W051 1OOma DRIVER Seven higher-current circuits. $22.00
W061 RELAY DRIVER Four quarter-amp, 55 volt, all-silicon drivers for loads returned to positive voltage. $35.00
W080 ISOLATED AC-DC SWITCH Two floating switches controlled by light beams. Allows isolated control of line-operated devices. One-quarter amp at 125v AC or DC. $60.00

* Normal Delivery off-the-shelf.

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W SERIES (Cont.)
W103 DEVICE SELECTOR For PDP-8. $52.00
W108 DECODING DRIVER 300-ma, bipolar drive with 8 drivers, $75.00
W500 HIGH IMPEDANCE FOLLOWER Seven fault-protected circuits, each comprising two cascaded emitter-follower amplifiers. Up to +- 30v in. $25.00
*W501 LEVEL CONVERTER AND SCHMITT TRIGGER Produces standard pulses from contact closures or non-standard negative logic levels. Switching thresholds can be 0 to -2.5 volts. Contact-bounce integrator included. $13.00
W502 PHOTON COUPLED TRIGGER Two isolated trigger circuits; each responds to light from tungsten filament falling on a photocell. Inputs 14v or 48v. $38.00
*W510 POSITIVE LEVEL CONVERTER Three inverters with input thresholds which can be set at 0, +lv, or +2v. $17.00
*W511 NEGATIVE LEVEL CONVERTER Two circuits for converting inputs between -50 volts and +25 volts to 3 volt levels. Switching point can be set to 0, -1, -2, or -3 volts. $17.00
W512 POSITIVE LEVEL CONVERTER W and A Series Interface for Positive Logic Systems. $25.00
W520 COMPARATOR An inexpensive comparator for A/D work, or a general purpose input level converter. Three circuits, each is a 4-transistor difference amplifier, DEC Standard levels at the output. $43.00
W532 DUAL AMPLIFIERS Two AC-coupled differentiaI amplifiers. $30.00
W533 DUAL RECTIFYING SLICER Two slicers that amplifies signals from a W532 and converts them to DEC signal. $30.00
W590 IBM N LINE TO DEC CONVERTER Each of five inverting amplifiers provides inputs compatible with three types of IBM N lines. $26.00
*W600 NEGATIVE LEVEL AMPLIFIER Three diode-transistor inverting amplifiers convert standard levels to outputs of ground and -1 to -15 volts. Node terminals provide for additional inputs. $12.00
*W601 POSITIVE IEVEL AMPLIFIER Three diode-transistor inverting amplifiers convert standard levels to ground and 1 to 20-volt outputs. Additional gates added through node terminals. $13.00
W602 BIPOLAR LEVEL AMPLIFIER Three inverting amplifiers for output levels at +6, +3, 0, -3, or -6 volts. $40.00
W603 POSITIVE LEVEL AMPLIFIER Amplifier drives positive logic systems from FLIP CHIP systems. $23.00
W607 PULSE AMPLIFIER Three pulse amplifiers. Input: 40-nanosecond (or wider) pulses at up to 2.5 megacycles. $42.00
W640 PULSE AMPLIFIER Three standardizing amplifiers with transformer-coupled outputs of 400 nsec at up to 500 kc, or 1 1usec at up to 200 kc. $42.00
W690 DEC TO IBM N LINE CONVERTER Each of four inverting drivers provides outputs compatible with three types of IBM N lines. $36.00
W700 SWITCH FILTER Six switch filters reduce the effects of contact bounce. $20.00
W705 POWER SUPPLY (+3.6v) Supplies upto 1 amp at +3.6 volts. $15.00
W706 TELETYPE RECEIVER Integrated-circuit, serial-to-parallel Teletype code converter. $150.00
W707 TELETYPE TRANSMITTER Integrated-circuit, parallel-to-serial Teletype code converter. $150.00
W708 TELETYPE INTERFACER Provides special gating controls and clock synchronization for Teletype and data communications systems, when used with the W706 and W707. $55.00

*Normal Delivery off-the-shelf,

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W SERIES (Cont.)
W800 RELAY Two normally open reed relays for up to 1/8 amp, 200 volts with contact protection provided. $45.00
W802 RELAY MULTIPLEXER Eight double-pole, normally open relays, their drivers and a gating circuit. $160.00
*W970 BLANK BOARD 36-pins $4.00
*W971 BLANK BOARD Double-height W970, 72 pins $8.00
*W972 CLAD BOARD 36-pins $3.00
*W973 CLAD BOARD Double-height W972, 72 pins $6.00
*W980 MODULE EXTENDER Allows access to circuits without breaking connections. $14.00
W985 ADAPTER Puts a System Module in four FLIP CHIP slots. $34.00
*W990 BLANK BOARD 18-Pins $2.50
*W991 BLANK BOARO Double-height W990, 36-pins $5.00
*W992 CLAD BOARD 18-pins $2.00
*W993 CLAD BOARD Double-height W992, 36-pins $4.00
*W994 PERFORATED BOARD   $4.40
*W995 PERFORATED BOARD A double-height W994. $8.80
B SERIES
*B104 INVERTER Four 10-megacycle inverters and three clamped load resistors. $17.00
*B105 INVERTER Five 10-megacycle inverters and five clamped load resistors $21.00
*B113 NAND/NOR GATE Four 2-input diode-transistor NOR or NAND gates with three clamped load resistors. $23.00
B115 NAND/NOR GATE Three 3-input diode-transistor NOR or NAND gates and three clamped load resistors. $21.00
B117 NAND/NOR GATE Two 6-input diode-transistor NOR or NAND gates. $14.00
B123 INVERTER Three 10-ma clamped loads, 4 pairs transistor inverters. $31.00
B124 INVERTER Three groups of three inverters, and three clamped load resistors. Logically complementary to B115. $31.00
B130 3-BIT PARITY CIRCUIT Two levels of gating at high speed, with complementary outputs. $50.00
B155 HALF BINARY-TO-OCTAL DECODER One output is grounded for each of four input combinations, if each of three auxiliary inputs is also enabled, $25.00
B171 NAND/NOR GATE One 12-input diode gate with two transistors. NOR and OR for ground signals; AND and NAND for negative signals. $18.00
B200 FLIP-FLOP For building simple 10 mc registers at low cost. Short delay from pulse input to flip flop output. $25.00
*B201 FLIP-FLOP General purpose flip-flop and nine input transistors. $56.00
B204 QUADRUPLE FLIP-FLOP Four flip-flops with an inverter for common clear. Can be set or cleared from their outputs. $29.00
*B301 DELAY One shot multivibrator with both pulse and level outputs. $73.00
B310 DELAY Four delay lines, each with maximum delay of 50 nanoseconds in 12.5 nanosecond steps. $66.00
B360 DELAY (WITH PULSE AMPLIFIER) Adjustable delay line (250 nanoseconds, maximum) and a pulse amplifier. $84.00
*B401 VARIABLE CLOCK   $57.00
B405 CRYSTAL CLOCK   $100.00
B602 PULSE AMPLIFIER Two pulse ampljfiers for negative or positive pulses. $36.00
B620 CARRY PULSE AMPLIFIER Two stages for long B201 counters. $47.00

*Normal Delivery off-the-shelf.

- (Page 396) -



B SERIES (Cont.)
B681 POWER INVERTER Four inverters each equivalent to two paralleled B105 type inverters. Includes a 20 ma clamped load internally connected to each collector, and four separate 10 ma loads. $25.00
B684 BUS DRIVER Two 40 ma drivers for direct or terminated connection. $52.00
A SERIES
A100 MULTIPLIER SWITCHES Solid-state analog switches. Transition time: less than one microsecond; offset; 100 to 300 microvolts. Controlled by standard levels and high frequency carrier. Transformer-coupled for isolation. $100.00
A103 $78.00
A121 $65.00
A111 MULTIPLEXER SWITCH Low level relay multiplexer with guarded contact wiring. Two three-pole relays. $93.00
! A200 OPERATIONAL AMPLIFIER 15 volt amplifier with a 2x10^6 open-loop voltage gain and a 15-megahertz unity gain. Differential inputs accept up to 10-volt common-mode signals. $130.00
A201 OPERATIONAL AMPLIFIER High-speed, 10-volt amplifier with a 10,000 open-loop voltage gain and a 15-megacycle gain-bandwidth product Differential inputs accept up to 10-volt common-mode signals. $180.00
A400 SAMPLE AND HOLD AMPLIFIER +- 10 volt sample and hold able to track a full scale excursion in 12 microseconds to 0.25% accuracy. $330.00
*A502 COMPARATOR Difference amplifier for signals as small as one millivolt. Standard output drives R- or B-series modules. $110.00
*A601 DIGITAL-TO-ANALOG CONVERTER Three-bit star networks with drivers and terminating resistor. $60.00
*A604 DIGITAL-TO-ANALOG CONVERTER Two-bit network with drivers for more accuracy. $62.00
A605 DIGITAL-TO-ANALOG CONVERTER Two-bit wirewound network with drivers for maximum accuracy. $78.00.
A606 DIGITAL-TO-ANALOG CONVERTER Two-bit network used with A604 to form one decade of BCD D to A conversion. $62.00
A702 REFERENCE SUPPLIES Both -10 volt references. A702: 10-millivolt ripple, 30 millivolt load regulation. A704: 0.1-millivolt ripple, 0.1-millivolt load regulation $58.00
*A704 $184.00
A990 AMPLIFIER BOARD Predrilled etched board on which can be mounted one of several dozen types of operational amplifiers manufactured by three different companies. $4.00
A992 AMPLIFIER BOARD Similar to A990, and also receives booster amplifiers. Accepts even more. different types, from many manufacturers. $4.00
HARDWARE ACCESSORIES
CAB-1 CABINET Includes End Panels $700.00!
Additional Cabinets $500.00!
CAB-2 CABINET Includes End Panels $700.00!
Additional Cabinets $500.00!
CAB-3 CABINETS Expander cabinet for PDP-8 $650.00
CAB-6 CABINET Includes End Panels $800.00!
Additional Cabinets $600.00!
CAB-8A CABINETS Free standing with winged table. $1,100.00

* Normal Delivery off-the-shelf.

! Non discountable

- (Page 397) -


HARDWARE ACCESSORIES (Cont.)
CAB-8B CABINETS Free standing with rectangular table. $1,000.00
*H001 BRACKETS One pair brackets to mount a 1907 cover plate on a 19" mounting panel. Provides 3/4 inch standoff, cover plate flush with cabinet. $8.00
*H002 BRACKETS One pair brackets to mount a 1907 cover plate on a 19 inch mounting panel. Provides 2 inch setback to leave room for lights, controls. $8.00
H201 CORE MEMORY 4096 x 13 bit core memory (90 day guarantee) $2,000.00!
*H701 POWER SUPPLIES Small, chassis mounted supply electrically similar to 782A. $116.00
*H701A $136.00
H704 POWER SUPPLY Will drive six operational amplifier modules. All silicon, regulated, floating supply providing +- 15 volts at up to 400 ma on both outputs. $200.00!
*H800F CONNECTOR BLOCKS Unmounted 144 pin connectors for 8 FLIP CHIP modules. $8.00
*H800W $8.00
*H801F PINS Set of 18 spare pins to fit FLIP CHIP sockets. $4.00
*H801W $4.00
H802 CONNECTOR BLOCK For single FLIP CHIP modules. $4.00
H803 MODULE SOCKETS Unmounted 288 pin connectors for 8-36 pin modules. $13.00
H804 MODULE SOCKETS Unmounted 144 pin connector for 8-18 pin modules. $9.00
H805 CONNECTOR PINS Set of 18 spare pins to fit H803 and H804 connectors. $4.00
H810(24) PISTOL GRIPHAND WIRE WRAPPING TOOL For wrapping #24 solid wire on DEC Type H800-W Connector Pins. $99.00!
H810(30) PISTOL GRIPHAND WIRE WRAPPING TOOL For wrapping #30 solid wire on DEC Type H800-W Connector Pins. $99.00
H810(24&30) PISTOL GRIPHAND WIRE WRAPPING TOOL For wrapping #24 and 30 wire on DEC type H800W H803 Connector Pins. $150.00
H811(24) HAND WRAPPING TOOL For wrapping #24 wire on Connector Pins in service or repair applications. $21.50!
H811A(30) HAND WRAPPING TOOL For wrapping #30 wire on Connector Pins in service or repair applications. $21.50!
H812(24) HAND UNWRAPPING TOOL For removing #24 wire wrapped connections. $10.50!
H812A(30) HAND UNWRAPPING TOOL For removing #30 wire wrapped connections. $10.50!
H820 GRIP CLIPS Identical to slip-on connectors used on Type 913 patch-cords. Fit sizes 24-20 AWG wire. Shipped in packages of 1000. $47.80!
H825 HAND CRIMPING TOOL For crimping Type H820 Grip Clips. Insures a good electrical connection. $146.70!
H830 STACK-ON RIVETING TOOL   $10.00
*H900 MOUNTING PANELS WITH POWER For up to 32 modules. Power supplies electrically similar to 782, 782A $180.00
H900A $200.00
*H901 MOUNTING PANEL For patching up to 10 modules. $82.50
*H902 SWITCH AND INDICATOR PANEL 5-in. panel for experimental use. Eight switches, eight indicator lamps with ground-enabled drivers, four rheostats for controlling clocks and delays. Complements H901 and 700D. Complete with indicator driver module. $112.80
*H903 ANALOG-DIGITAL PANEL D-A converter and comparator (including module). $143.00
H910   36-pin equivalent of H900. $200.00
H910A 36-pin equivalent of H900A.

* Normal Delivery off-the-shelf.

! Non-discountable

- (Page 398) -



HARDWARE ACCESSORIES (Cont.)
H911B MOUNTING PANELS Similar to the 1943 but uses H803 and H804 connectors. Following options available as indicated by the suffix letters: Marginal Check Switches (M) or terminal block (B), prewired power (P) or not. $151.00
H911BP $161.00
H911M $172.00
H911MP $182.00
*700D POWER SUPPLY WITH DIAL 5-in. panel for powering and pulsing experimental logic systems patched together on H901 panels. Contains a variable clock, three pulsers, with a telephone dial and three push-buttons for driving the pulsers. Designed especially for educational use. $323.00
700DA   50-cycle version of 700D. $343.00
*728 POWER SUPPLIES +10 v @ 0.7 amp, -15 v @ 1.8 amp, for 17" DEC cabinet plenum-door mounting. $240.00
*728A $260.00
*782 POWER SUPPLIES Rack-mounted power supplies with regulated +10 and -15 volt output at up to 0.4 and 3 amperes, respectively. Input: 782: 115 volts, 60 cycles. 782A: 112.5 to 235 volts, 50 cycles. $128.00
*782A $148.00
*783 POWER SUPPLIES Rack-mounted power supplies with electrical characteristics similar to 728 and 728A. $240.00
*783A $260.00
786 VARIABLE POWER SUPPLIES Standard rack mounting 0-24 volt variable supplies, 0-2.5 amp $215.00
786A $235.00
831 POWER CONTROL Specify 4, 10, 20, or 30 amp circuit-breaker: $51.00
*900 CONTROL PANEL A front panel and chassis exactly duplicating 700D but without power. For multi-student installations on a Logic Laboratory. $214.25
*911 BANANA PATCH CORDS Ten each 2, 4, 8,16, 32, or 64 inches. One box. $9.00
*913 WIRE WRAP PATCH CORDS Hundred each 2, 4, 8, 16, 32 or 64 inches, One pkg. $18.00
*914.7 POWER JUMPERS Ten each 7 inches long. One pkg. $4.00
*914.19 POWER JUMPERS Ten each 19 inches long. One pkg. $4.00
*932 BUSSING STRIP   $.60
*1907 MOUNTING PANEL COVER 51/4 by 19 inch cover plate to protect power and logic wiring and permit installation of lights and control switches on a 19 inch mounting panel. Use with one pair of brackets, H001 or H002 (order separately). $9.00
*1943-F-B MOUNTING PANEL Houses 64 modules in a standard 19-inch rack. FolIowing options available as indicated by the suffix letters: Forked-pin solder (F) or wire-wrap (W) connectors; marginal check switches (M) or terminal block (B); prewired power (P) or not. $111.00
*1943-W-B $111.00
*1943-F-B-P $121.00
*1943-W-B-P $121.00
*1943-F-M $132.00
*1943-W-M $132.00
*1943-F-M-P $142.00
*1943-W-M-P $142.00
1945-19 HOLD DOWN BAR For 1943 mounting panel (19-inch). $15.00
4906 SINGLE INDICATOR With amplifier. $9.50
*4908 SINGLE INDICATOR Lamp and mounting hardware. $3.00
4912 ADAPTER Puts a FLIP CHIP module in 2 system module slots. $28.00
*4913 MOUNTING RACK For a power supply and four 5 1/2 inch panels. $47.00
4917 INDICATORS 9 bit indicators with amplifiers. $73.00
4918 INDICATORS 18 bit indicator with amplifiers. $96.00

* Normal Delivery off-the-shelf.

- (Page 399) -



OCTAIDS and PANELAIDS (@)
D001A D-A CONVERTER 8 Bits $377.25
D001B D-A CONVERTER 9 Bits $439.25
D001C D-A CONVERTER 10 Bits $439.25
D001D D-A CONVERTER 11 Bits $501.25
D001E D-A CONVERTER 12 Bits $519.25
D001F D-A CONVERTER 13 Bits $597.25
D002 BCD UP-COUNTER Single Decade $62.50
Quad Decade $137.20
D004 BI-DIRECTIONAL DECADE COUNTER   $123.40
Decoding Option $47.00
Conversion Option $17.00
D005 INPUT BUFFER INTERFACE For PDP-8/S $122.00
D006 OUTPUT BUFFER INTERFACE For PDP-8/S $215.50
D007 DUAL SHIFT REGISTER 8 Bits $249.00
Single Register $133.00
D008 DUAL UP-COUNTER 8 Bits $217.00
Single Up-Counter $117.00
C001 A-D CONVERTER 10 Bits, 60 Hertz $1,144.00
C001A A-D CONVERTER 10 Bits, 50 Hertz $1,162.00
C002 A-D CONVERTER 10 Bits, without AC power. $1,079.00
C003 BCD REAL TIME CLOCK 50/60 Hertz $639.00
C005 I/O BUS INTERFACE For PDP-8/S $12.00
C006 I/O BUFFER REGISTER For PDP-8 or PDP-8/S $397.00

(@) See Printed Circuit Board Price List on Page 273.

All shipments are FOB. Maynard, Massachusetts, and prices do not include state or local taxes.
Prices and specifications are subject to change without notice.
QUANTITY DISCOUNTS
$5,000 -- 3%; $10,000 -- 5%; $20,000 -- 10%; $40,000 -- 15%;
$70,000 -- 18%; $100,000 -- 20%; $250,000 -- 22%; $500,000 -- 25%
Discounts apply to any combination of FLIP CHIP, Cabinets are not discountable.

- (Page 400) -

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27-Jan-2002
Source: DEC Logic Handbook, 1967 pp393-400