Just a quick pic of the devkit made for Phoenix. This has been several months in the making, so I hope all the hard work is worth it

Well, after only an hours coding, the page write method is working. Using ’safe’ values to guarantee correct writes, a whole 8K eeprom can be written in roughly 3secs. Using the exact same ’safe’ values in byte write mode takes around 2m10s!
This pretty much concludes the adventures with the hardware side of Eprom Emul. The […]

A picture taken last night shortly after the successful programming of an eeprom using Eprom Emul.

Well, after a couple of days of frustration, the software for Eprom Emul is now working. Last night saw the momentus first ever successful write of a full rom image to an AT28C64B using the Eprom Emul. The bad news here is that because of the AT28C64B’s internal workings, to test my code correctly, I […]

After the last batch of boards got lost in the post, the second batch of boards arrived! I’ll start soldering later and should have one completed by the weekend. Ready for posting on Monday

Well after contacting the board makers about a week ago to say the Eprom Emul boards hadn’t arrived, the new ones have now been shipped and should be with us soon. All free of charge

Ok, we now finally have the finished schematic and board layout for the Eprom Emul v0.31. The MKII was redesigned again and an extra control line for /WR was added to make the write cycle more reliable.
The Eagle CAD .brd files will be sent of for checking and processing shortly.

The new battery backup feature of the Eprom Emul MKII has been fully tested and is working very well. It runs using a small control chip and a CR2032 battery.

The Eprom Emul MKII has had another upgrade thanks to an idea from Phoenix. The board shall now have a battery backup feature, so the 32k SRAM chip can be stored while powered down.
Testing shall commence shortly on this.

The Eprom Emul schematic has been redesigned with the addition of two jumpers. The control the two MSB of the address lines so you can lock the eprom to set size. The options are 8k, 16k or 32k. Which makes the Eprom Emul more flexible for future use on other circuits.