View source for CFFA1

[[Image:2026-CFFA1-Original-tiny.png|thumb|R&D Automation CFFA1|link=https://wiki.reactivemicro.com/images/b/b3/2026-CFFA1-Original-tiny.png]]

The CFFA1 is mass storage controller card for the Apple 1 and its clones.  R&D Automation has designed the card to interface with the expansion slot on the Apple 1 motherboard. The CFFA1 allows access and storage of files on CF media via simple menu driven interface.


<strong>Product Status:</strong> Actively sold by Manila Gear and ReActiveMicro.

<strong>Support:</strong> Post on the [[{{TALKPAGENAME}}|Discussion]] page (link above) or email [http://store.reactivemicro.com/contact-us/ ReActiveMicro Support].

<strong>Sales:</strong> Visit the [http://store.reactivemicro.com/shop/ ReActiveMicro Store].


== History ==
The CFFA1 was created by R&D Automation and released for sale in March of 2007. On November 10, 2023 ReActiveMicro officially announced the addition of the CFFA1 to the RM Store.


==DIP Switch Settings==
The DIP Switch is located at the upper RIGHT corner of the card, and is designated "S1".<br>
The default setting for the switch is: 1-OFF, 2-ON, 3-OFF, 4-6-ON.

 * S1-1: Unused.  Can be in any position.

 * S1-2: Set switch to ON to disable response from the onboard SRAM in the address range of $1000 to $7FFF. This is useful if you are using a Replica1 computer, which already provides SRAM in this address range. Leaving this switch OFF on a Replica1 or any host system with RAM in this address range will result in a bus fight and unpredictable computer operation.

 * S1-3: Set switch to ON to set pin19 of the CPLD to a logic 0. This pin is currently unused. But may be used in future release of CPLD logic firmware.

 * S1-4: EEPROM Write Enable. When set to OFF, this switch prevents accidental and intentional writes to the EEPROM. Always leave this switch in the OFF position until you want to change the EEPROM contents.

 * S1-5: Set switch to ON to enable the 32KB SRAM. This SRAM is mapped into the host computer at $1000 to $8FFF. This cannot be changed without reprogramming the CPLD. You can however prevent the SRAM from responding to addresses $1000 to $7FFF using S1-2. This is useful if you are using a Replica1 computer. Note: the Menu firmware developed for the CFFA1 needs RAM to exist from addresses $8000 to $8FFF on the host computer. If your host computer already has this RAM then disable the CFFA1‟s onboard SRAM by switching this switch OFF.

 * S1-6: Reset Enable. Factory Default: jumper installed. Connects Apple bus reset signal to CF device reset. I recommend leaving this jumper in.