View source for CompactFlash Adapter for Tandy 1400 Laptops

[[File:CompactFlash-Adapter-for-Tandy-1400-Laptops-assembled.JPG|right|300px|CompactFlash Adapter for Tandy 1400 Laptops]]

The [[CompactFlash Adapter for Tandy 1400 Laptops]] is a system specific [[Lo-tech XT-CF Boards|XT-CF]] variant for [[Tandy 1400 Series Laptops]].

The board is programatically identical to the [[XT-CF-lite]] and is therefore powered by the [http://code.google.com/p/xtideuniversalbios/ XT-IDE Universal BIOS], provided through an in-system re-programmable 32KB (addressible) flash-based ROM. Since the BIOS is only 8KB, 24KB is available for other purposes, and is byte-programmable.

To buy this and other PCBs, please visit [{{SERVER}}/shop the lo-tech shop].

== Specifications ==

=== General ===

*8-bit [[Tandy_1400_Series_Expansion_Slots#Expansion_Slot|Tandy 1400 Series Expansion Slot Card]] with CompactFlash header
*Entirely 5V CMOS logic
*Low-cost flash memory chip for boot ROM, with 32KB usable
*Port-mapped IO; supports both 8- and 16-bit instructions (via partial address decoding)
*Utilises [http://code.google.com/p/xtideuniversalbios/ XT-IDE Universal BIOS] (XTplus build; adapter type: 'XT-CF')
*Fixed resource allocation - IO ports 300-31Fh, ROM 32KB at C800h
*Compatible with any CompactFlash card (microdrives are not supported due to power budget limitation from the Tandy 1400 expansion slot)

== PCB ==

[[File:CompactFlash-Adapter-for-Tandy-1400-Laptops-pcb.jpg|right|300px|CompactFlash Adapter for Tandy 1400 Laptops PCB]]

== Bill of Materials ==

{|class="wikitable"
!Part !! Device !! Package !! Qty !! Farnell !! Mouser
|-
|IC1, IC2 || 74HCT688D || SOIC-20W || 2 || 1085321 || -
|-
|IC3 || 74HCT139D || SOIC-16 || 1 || 9591834 || -
|-
|IC4 || AMIC - A29010-70F || DIP-32 || 1 || 1907092 || -
|-
|R1, R2, R4 || 10k Resistor || 0603 || 3 || 1469748 || -
|-
|R3 || Do not populate || - || - || - || -
|-
|R5* || 1k6 Resistor || 0603 || 1 || 2138367 || -
|-
|C1..5 || 0.1uF Ceramic Capacitor || 0603 || 5 || 1414610 || -
|-
|C6 || 10uF Electrolytic Capacitor || E2-5  || 1 || 8767084 || -
|-
|CF1 || 3M NE750-Q516RB-50 CompactFlash Header || - || 1 || 1267444 || -
|-
|IC Socket || - || DIL32 || 1 || 1654375 || 571-1-390263-2
|-
|JP1, LED* || AMP - 826629-2 || 1x2 Pin Header || 2 || 3418285 || -
|}

<nowiki>*</nowiki>Components only needed if activity LED is required

*Board design permits the use of a range of DIP-32 flash chips (1, 2 or 4Mb):
**[{{SERVER}}/downloads/manuals/SST/SST39SF0x0.pdf SST39SF0x0A] (SST39SF010A, SST39SF020A, SST39SF040A)
**[{{SERVER}}/downloads/manuals/AMIC/AMIC-A29010.pdf AMIC A29010]
*Regardless of the chip used, 32KB is presented commencing C800h

== Configuration ==

*JP1: ROM enable (closed = enabled)
*An external LED can be attached to the 2-pin LED header, but a low-current type must be used (approx 2mA available).
*The IO port address (300h - 31Fh) is fixed, as is the ROM address (32KB at C800h) - note therefore the board cannot co-exist with the [[Tandy 1400HD]] MFM disk controller
*Pre-configured BIOS based on XTIDE Universal BIOS r567 is available [{{SERVER}}/downloads/XT-CF/ISA-CF-BIOS-r567-late-init.zip here]
*The flash ROM can be programmed with the [[Lo-tech XT-CF flash utility]]

== See Also ==

*[[lo-tech XT-CF Boards]]
*[[Tandy 1400 Series Laptops]]