Briel Computers

Archive for March, 2013

Hard at work designing the next platform

by on Mar.31, 2013, under Vince's blog

I’ve been spending my free time working on a new project. This platform system will have a 65C02 and emulate the OSI 600 Superboard II or Challenger C1P. Visit the forums for pictures I’ve posted of my messy wire-wrap board with tactile buttons for a keyboard. The final version will have larger buttons but I’m having a difficult time getting buttons that are the right size, right price and has different sizes for SHIFT, RETURN, ENTER, and SPACE BAR. I’ll come up with something but I’m open to any ideas. Just email me at vbriel@yahoo.com and I’ll look at your suggestions.

What’s great is the wire-wrap board is actually really stable, almost as good as a PCB and yet I don’t have any caps on the chips for noise. Right now, I’m ready to implement the serial interface. I’m not going to do the cassette interface as they are just a real pain to deal with. After I have that working and an external keyboard option, I’ll lay down a board and see how things look. If you are interested in me going into production on this, email me and let me know so I can get an idea of how many people might want one.

Vince

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by on Mar.06, 2013, under Vince's blog

Well, my wirewrap project has been on standby while the design details get worked out. It appears that I’m running out of I/O pins on a micro controller and I’m having to dance around that a bit. I should be starting today. This may be my first board that is all 3.3V based. My other boards all use standard TTL 5V logic levels for most of the work and 3.3V where needed. This causes interfacing issues so I may think outside the box again. I like having all my projects do something a little different. The replica 1 TE was the first kit I used the Propeller on. The Micro-KIM was the first kit I kept most of the original design. The Altair 8800micro was the first CPU emulation I wrote. What’s next? Hopefully I can post pictures soon, but I don’t want to show something that is years away, so I’ll post updates when I have a board working.

What I can say is that with the help of Jac Goudsmit I have a Propeller micro controller connected to a 6502 bus using the Propellers onboard memory as video RAM. This means I can connect a Propeller controller to a 6502 system and directly address video RAM at 1MHz speed. We also have the ability to eliminate ROM this way but the project I’m working on also has a serial port and keyboard. This is where aspirin gets applied. We need to shuffle 1 or 2 pins to give us the I/O required for everything. Once this is done, the project will make a nice single controller I/O package for 8 bit processor systems.

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