The basic MicroVIP is working! Here is the status so far:
First, I built up the basic hardware with the VIP feature set (except for the tape interface). There are some features that can be added later. I got the processor, RAM, ROM going using a modified version of the UT4 monitor. I got things working in ModelSim first. Next, I used a USB to TTL serial adapter (3.3V Prolific) to interact with the computer.
With UT4 and the serial port, I was able to do some basic tests. I wrote simple programs to test the hexadecimal keypad. I also could test the speaker.
From there, I added the VIP ROM and video. With some debugging using ModelSim, I got it working in hardware.
So far, it operates as a standard VIP but with only memory read and write working. The speaker does beep with the Q line. The keypad is functional as well as the video output.
Next, I want to get the SPI working to use the serial flash as a tape emulator. I'm using a 16MB serial flash because it's very inexpensive ($5) and easy to acquire. I realize for a 1977 type computer that is a near infinite amount of space. I will also modify the VIP ROM software to use the serial flash.
After that, I want to have CHIP-8 in RAM on power up and recreate some of the projects in the VIP manual.
For the future, I'd like to add a Tiny BASIC and an ASCII keyboard interface
Quartus II 11sp1 (This is the last one to support the Cyclone II)
Altera ModelSim (comes with Quartus)
USB Blaster (or equivalent) I have a Terasic Blaster
Composite Video monitor
+5V Wall Wart (~1W) to power the Cyclone board
USB to TTL cable (3.3V I/O) I'm using the one from Adafruit