The G7000RAM is a special cart designed for the Videopac G7000 / Odyssey² video game console. It can be used to upload self-written programs into the console via a standard RS-232C connection running at 19200 bps or 9600 bps. The programs can have a size up to 12K organised in 4 banks. The G7000RAM can also be used on the Videopac+ G7400 console.
In the current version of the G7000RAM it is not possible to develop programs which use "THE VOICE". I hope to fix this in the future, but I think it is not possible without major changes, both use the T0 input.
There are now some Gerber data files in the download section. Gerber is a file format used by professional PCB manufacturers. These files have been used by others to produce G7000RAM PCBs. The Gerber files are slightly cleaned up when compared to the version 1.1 layout.
I have now added support for NTSC machines. I have not tested it on real Odyssey^2 machines, only on a modified Videopac G7000. So if you can test it please tell me if it works.
I have also fixed a small bug in the 9600 bps mode. Sometimes the last bit of a byte was used as start bit for the next one.
All older versions have a massive bug: because of the extremely simple hardware writing to the VDC in download mode trashes RAM contents. So when the download ROM writes "FINISHED" it trashes the just downloaded program in the range from 0f00h-0fffh. It took me some time until I wrote a program that big and found this bug.
The software displayed only 1 stop bit in the serial parameters at 19200 bps. The order of the serial parameters was changed, they are now the same as the DOS mode.com order. I have also written a small DOS batch file to upload files to the G7000.
The only fix in 1.2 was to a problem which showed sometimes on my G7000. On power up the display of the download speed was not always complete. To fix this I no longer use all 4 quads in 1 line.
It is now possible to upload programs in 19200 bps with 2 stop bits. The old 9600 bps mode is working, too. There are now messages on the screen showing the chosen download speed and when the download is finished. I have also included into this release a schematic in PDF format. To be on the safe side I have added an additional filter capacitor into the power lines.