SURFACE MOUNT COSMAC VIP
I have been working on a surface mount COSMAC VIP for a while now. I decided to build this after finding out that Intersil made a surface mount version of the 1802.
It works just like the original RCA VIP. This computer will read in my old cassette tapes. It even works with the old expansion boards.
When I finally located a CDP1802ACQ, I started designing the circuit.
- The circuit is basically the same as a fully expanded RCA COSMAC VIP. I did a few updates though. Here is a list:
- Audio jacks instead of wires
- Video jack instead of wire
- Onboard speaker (VP-711 had one, VP-111 did not)
- Speaker mute switch.
- 32K EEPROM for VIP monitor (wired as 512 bytes on this version)
- 32K of RAM which can be configured as 4K, 16K, 24K or 32K with shorting pads on underside of PCB
- Battery backup for RAM
- Battery backup bypass by shorting pads on underside of PCB
- 2 Amp onboard switching 5 volt power supply
- Shorting pads on underside of PCB to allow use of VP-590 Color Board with out removing chips
Here are some photos of the finished board:
As you can see in the photos, I used some through hole parts because I couldn't find suitable surface mount versions.
- Non-surface mount items:
- - Keypad
- - 44 pin expansion connector
- - 44 pin I/O connector
- - Video jack
- - Backup battery socket
- - C&K RUN/RES switch
I made the PCB the same size as the original RCA VIP. I have a bunch of space for adding circuitry in future versions.
Comments and questions welcome.
Please feel free to contact me at the e-mail address in this image: