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Content 4/4

Project created by (c) 2017 Ralph Benzinger.


This is a great project that I feel should be available to everyone. All thanks, donations, etc. should be addressed to Ralph.


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.


The FinalGROM 99 supports ROM images, GROM images, and mixed images of up to 1 MB in size that use the write-to-ROM bank switching scheme. The cartridge does not require the Peripheral Expansion Box and runs on both PAL and NTSC consoles, including modified consoles with an F18A. It will also run on v2.2 consoles and enables those to run ROM-only programs.

The cartridge offers some advanced modes that provide RAM and GRAM to programs. It also allows a running program to reload another program from SD card or to dump its state to SD card. All firmware of the FinalGROM 99 can be updated by SD card.


The FinalGROM 99 is released as Open Source Hardware under the CERN OHL license and the GNU GPL license. Both hardware design files and firmware sources are available on GitHub.


PCB v2.01 Changes:

------------------------------

* added a 47k resistor (R5) from 3.3v to SDI for increased sd card compatibility

(Do not install R5 if using an Arduino SD shield Module)

* minor silkscreen modifications and adjustments

* edge cuts adjustments


PCB v2.02 Changes:

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* added jtag header and power header (development use)




Jun 06,2020
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