Improved TS2068 Internal ROM Bypass

Detailed hardware design for replacing the TS2068’s HOME ROM and EXROM without opening the computer case, using the cartridge slot to intercept the bus enable (BE) signal. Three designs: HOME ROM bypass (Figure 1) using BE-driven suppression of ROMCS in combination with external ROM/RAM; EXROM relocation (Figure 2a) by physically remounting the chip with full address decoding on an external board; and an advanced EXROM bypass (Figure 2b) using a latch circuit. Bypass board features include full rear connector pass-through, dual ROM sockets (RAM for development, EPROM for production), write-protect switches, jumpers for battery backup removal, and optional RGB video output. Includes complete circuit schematics and a short BASIC program to copy HOME ROM and EXROM to the bypass board. Declares the design public domain through The WIDJUP Co. Also includes a special message to DOS/mass-storage manufacturers about OS compatibility requirements for bank switching.