update: I received my MTVGA PCBs yesterday and have built one up. So far so good, powers up like it should. I've been reverse engineering the DVI, and I've decided to try and make this 100% compatible with DVI meaning the M100 will auto-detect it's presence, and MTVGA will auto-load and install the DVI software that originally came with DVI. This requires the ability for MTVGA to store and deliver to the M100 the needed DVI software. Plan is to use I2C serial eeprom for that.
On Sat, Nov 3, 2018 at 12:55 PM Stephen Adolph <[email protected]> wrote: > Last year around this time I sent a note talking about REXCPM, a REX-like > board that is based on 2MB of SRAM, with some features to enable all-ram > mode + ramdisk. > The project is going well, although a bit stop and start on my side..3 > board spins. The hardware is working, and I'm about to mail a version for > M100 to Phil Avery. > With any luck we will get CPM running on a M100 with a plug and play > hardware upgrade. > > Now, on to the next thing. > What's shown below is my prototype "mtvga" model T VGA card. > > [image: 54ff6876701ffe1903352f9643ea838c.png] > > This board is my development board. It will plug into the back of a T102 > on the system bus connector. > > Here's the basics- > * supports 640x400 VGA monochrome (green) > * that will enable 80x25 text > * I hope it consumes no more than 30mA but we shall see (powered by M100) > * uses a Coolrunner XCR3256XL CPLD, and a single 128kB SRAM for character > bit maps as well as video RAM. > * this board also includes a serial port, so I can play around with > high(er) speed serial to see just how fast the M100 could go. (this is > important when backing up a 2MB ram disk) > > There are several similar projects on the net that describe how to > accomplish this, so I believe it should come together. >
