Tandy 1400 Series Expansion Slots

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Tandy 1400 Series Laptops included a two expansion slots on a riser card under the right-hand drive bay:

The memory fitted to the memory expansion slot in the 1400LT was included on the FD/HD motherboard - all machines had 768KB RAM.

Expansion Slot

Mechanical Drawing

From the 1400LT Service Manual (page 4-66):

Tandy-1400-Expansion-Slot-PCB-Mechanical-Drawing.png

Pinout

Pin Signal Notes
P1 N/C -
P2 5V 200mA max
P3 /ENABLE -
P4 N/C -
P5 N/C -
P6 /DACK0 System RAM refresh
P7 IRQ3 -
P8 N/C -
P9 GND -
P10 A0 -
P11 A1 -
P12 A2 -
P13 A3 -
P14 A4 -
P15 A5 -
P16 A6 -
P17 A7 -
P18 GND -
P19 A8 -
P20 A9 -
P21 A10 -
P22 A11 -
P23 A12 -
P24 A13 -
P25 A14 -
P26 A15 -
P27 GND -
P28 A16 -
P29 A17 -
P30 A18 -
P31 A19 -
P32 D0 -
P33 D1 -
P34 D2 -
P35 D3 -
P36 GND -
P37 D4 -
P38 D5 -
P39 D6 -
P40 D7 -
P41 /EMW -
P42 /EMR -
P43 GND -
P44 /EIW -
P45 /EIR -
P46 /TC Active low (opposite to ISA bus)
P47 ALE -
P48 /BRST Active low (opposite to ISA bus)
P49 /DACK1 -
P50 IRQ2 -
P51 GND -
P52 5V 200mA max
P53 ECLK 50% duty cycle CPU clock
P54 IRQ5 -
P55 DRQ3 -
P56 /DACK3 -
P57 BEN -
P58 DRQ1 -
P59 IOREADY -
P60 N/C -

Eagle PCB Layout

  • Eagle Part Script
  • To use, create (or open) a library, then open the file via File/Script

See Also