You can buy supposedly 'authentic' US Doubler from B&C or BEST, although I was disappointed to receive an EPROM from B&C earlier this year...
Haven't mentioned Turbo 1050 yet in the thread, but that is another interesting beast, of which replica's are available from TF_HH... Adds Double-Density and faster than ultraspeed with no additional RAM - only a comparatively large 32KB ROM.
Summary of install methods for each:
- Any variant of Happy 1050, authentic or replica, and Mini-Speedy use the same install method: Remove U10 (ROM), Remove U9 (6507 CPU), plug happy board into U9.
- US Doubler: Remove U10 (ROM), Insert USDoubler ROM into U10, may have to move jumpers to JP2 and JP4 (for EPROM configuration), remove U8 (6810 RAM), Install ICD black epoxy module into U8, or homebrew dual-stacked 6810.
- Turbo 1050 - Remove U10 (ROM), and insert Turbo 1050 board into U10. There's a jumper on the PCB to configure the board for either ROM jumper config.
As long as the RAM module is epoxy encased with the ICD logo I would consider it original, since the US Doubler has both ROM and EPROM versions.
- Kyle22 likes this