32k sidecard memory expansion for the TI-99/4A

Assembly required. Requires solder & soldering iron, and recommend having a breadboard you don't mind getting a little melty.

NO ELECTRONIC PARTS ARE INCLUDED IN THE KIT, ONLY THE CARD EDGE CONNECTOR AND THE PCBOARD..

To assemble this kit you will need:

• Cypress 32k SRAM
• 74HCT245
• 74HCT138
• 74HCT21
• IC SOCKET 20 PIN
• IC SOCKET 14 PIN
• IC SOCKET 16 PIN
• IC SOCKET 28 PIN 0.6"
• 4x 0.1uf ceramic decoupling capacitors
• 2x 1k ohm 1/4 watt resistor
• 10k ohm 1/4 watt resistor
• 680 ohm 1/4 watt resistor
• 3mm RED led
• 2N3904 transistor
• 44 pins of 2.54mm male headers
• 3 pins of 2.54mm male headers - same as above, break off a few.
• header jumper
• 44 single pin sockets
• DC 2.1x5.5mm power jack

See https://www.jedimatt42.com/ti32kmem.html for assembly instructions. or watch this:

From the designer:

I felt we needed a simple 32k expansion that slaps onto the side of the 4a, or side of the speech synthesizer... So I've been trying to build one.

There are a number of new cartridges that require the 32k memory expansion to function. And with the Flash ROM 99 EA5 conversion craze, a console with 32k on the side can suddenly play a much larger library of classic and new TI software titles.

My intent was to build and offer finished product. I envisioned a vertical board about 3" high by 4" deep, chips to the right, edge connector to the left. And a jumper for external or internal power.

Since the ti speech synthesizer blocks the 5v line from it's outgoing connector you will either need to extend the pin 1 line across the speech pcb or provide external power.

YOU DO NOT NEED THE POWER SUPPLY IF YOU ARE PLUGGING DIRECTLY INTO THE CONSOLE If you use an external power supply you must move the power jumper from TI to EXT.

-M@