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:
- Expansion slot - all variants
- Memory Expansion slot - Tandy 1400LT
- Hard Disk Controller slot - Tandy 1400FD and Tandy 1400HD
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):
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 | - |