A few years ago I designed some Apple 1 peripheral boards which I have documented on my web site Apple1notes.com. I have some extra bare boards and I am considering selling some sets of those boards. The boards include:
Expansion board with three sockets and 1 edge connector for daisy-chaining. The Expansion board buffers most of the signals with the Data lines optionally buffered and jumpers to manage the data read/write when buffered. I have tested up to three Expansion boards daisy chained.
The FRAM board can provide memory expansion and replacement for the onboard DRAM and ROM with non-volatile memory that retains it’s contents when powered down. To get the most out of the Board the Apple 1 VMA line which is jumpered to 5 volts should be reenabled by replacing the jumper with a shunt RC to allow the onboard DRAM and ROM to be disabled by the FRAM board on a cycle by cycle basis. The memory space is managed in 4K blocks with switches and jumpers so blocks can be configured as FRAM off, FRAM R/W, FRAM Read with DRAM Write, or FRAM Write with DRAM Read. The 0 block can be configured as FRAM R/W or DRAM R/W and the F block can be configured as FRAM Write with ROM Read, FRAM R/W, or FRAM Read Only. The board is also useful without the VMA Mod to provide non-volatile RAM in open address space.
The Serial Board is 6551 based and can replace the Apple 1 Keyboard and/or Apple 1 display routing input and output to the Serial path. This board also uses the VMA line to disable the onboard I/O as needed to take over the functions but can be used as a Serial Board peripheral without the Mod since the 6551 registers are available to software. The 6551 does need registers initialized to function properly.
The USB board is based on a custom device called Easy Input designed by Mark Lincer under the name Radovan. The parts are no longer available but I have a pretty good stock and will provide one with the boards, probably mounted on the board since that is the easiest way to ship it. The USB board captures the display output from the Apple 1 and creates an output that looks like it is coming from a USB keyboard. This allows you to put the the Apple 1 display on a Mac in a properly formatted Text Edit window using the proper font. With a USB to Bluetooth converter you can even get the Apple 1 display on your iPad or iPhone. This board also uses the VMA line for reliable operation but seems to work ok without it showing output on both the Apple 1 Video and Keyboard output.I have attached some documentation and
has more information and videos that showcase these boards. The three peripheral boards can be set up to either plug into the Expansion board or plug directly on to the Apple 1 or Clone on the peripheral connector with an optional board connector.
My plan would be to sell the three bare peripheral boards, bare expansion board and Easy Input device for around $50. I will not be as available as I would like to provide support as I am very busy as primary caregiver for my wife.
I would like to know if there is any interest.