Projects

• TI-99/4A

Description: Cartrdige 512k v.1.0 

Original Concept Mainbyte.com. This version was designed by us with SMD components, the original project is by James Fetzner, special thanks to him...

U1= 74LS378

R1= 68ohm R2= 2,2 Kohm

C1=10 uF C2=10 nF C3= 100 nF

The photo of the pcb shell is from FG99. For the cartridge it is the same without some peculiarities!

• TI-99/4A

Description: Eprom Adapter 2532 to 2732 V.1.0

This adapter allows you to replace the two PROM U610 and U611 of your TI-99 / 4A with two Eprom 2732s, being easier to find. The adapter can be used in all repairs where you need to replace the Eprom 2532.

• TI-99/4A

Description: The TI 99/4A FinalGROM Cartridge, or FinalGROM 99 for short, is a cartridge for the TI 99/4A home computer that allows you to run ROM and GROM cartridge images from an SD card. It succeeds the FlashROM 99 released in 2016.

link Project  Original Concept and Special Tanks To : Ralph Benzinger

link ITA  Interview with Ralph Benzinger

Description: Finalgrom cartridge container

• TI-99/4A

 
Description: Joystick Adapter.

 Atari-style joystick adapter for use with our TI-99. The project is not mine. We just assembled the PCB and made the case in 3D.

• TI-99/4A

Description: RAM Expansion 32k v.1.0

My interface is different from all those in circulation, because it only uses 3 chips and not 4 like all ! Two versions were made, the first (V.1.0) with the horizontal connector and in 2021 the version (V.2.0) with the 90 degree connector, completed by the 3D printed shell.