Premium to Premium Plus upgrades

[MbeeTech]

For those of you that don't know the Premium Plus - it is the model of microbee that we relaunched 
the company with back in 2011.


Here are the specifications of the Premium Plus for reference:  (for the full Premium plus as a kit)
Dual Microprocessors
* Z80 microprocessor @ 3.375Mhz
* Coldfire V2 (MCF52259) @ 80Mhz
* 2 Megabytes Ram (1Mbyte shared space, 1Mbyte exclusive to the Coldfire processor) 
32k PCG Ram, 2K Color Ram, 2K Attribute ram, 4K font rom
Original Premium Series Case,
Full 64 Key Keyboard with newly sourced keyswitches & keytops.
Microbee standard DB15 Parallel port, 
Microbee standard DB25 Serial port,
Second serial port for up to 115k baud,
Physical Floppy disk interface supporting up to 2 external floppy drives (option),
SD Card interface for file storage, with Floppy Disk emulation in ‘Z80’ mode 
- status indicator LED for SD activity^.
Ethernet Network port (10/100) including status indicator LEDs for Link Valid & Speed. 
Monochrome composite Video out, 
Color composite Video out (option), 
Color TTL video out (DB9 to monitor),
Built in software : Disk boot prom, Self Test, Machine Langauge Monitor. 
Other software on SDcard : uCLinux, Z80 mode Microbee Shell etc.