bentendo64
Active Member
This is a thread for my homebrew microcomputer project, the Bentendo6004.
This is also posted on Hackaday Projects, but I like the regular forum style better for some reason.
https://hackaday.io/project/808-bentendo-6004
The CPU I'm using is the Intel 8085, running at 3MHz. Current roadmap for final(?) design features:
So what I have done so far is the CPU board, the 8k SRAM board, and part of a ROM board, currently populated with one socket and 8 lines of address decoding in 2k blocks. Currently using a 2k NVRAM for testing stuff. I have two 2k EPROMs that will likely end up here eventually. Pictures and stuff:
Naked mobo:
Its underside:
8k SRAM:
The bottom (about 340 solder joints
):
Running a test program to turn on the LED hooked up to the SOD pin:
NVRAM programming (without the NVRAM, apparently):
Testing the RAM board because something wasn't working somewhere:
This is also posted on Hackaday Projects, but I like the regular forum style better for some reason.
https://hackaday.io/project/808-bentendo-6004
The CPU I'm using is the Intel 8085, running at 3MHz. Current roadmap for final(?) design features:
- 8k SRAM at the top of memory space (already built and functional)
- 32k-256k SRAM broken into pages of 512 bytes located just below that (may decide on 1024 byte pages). This will be used for program instructions and data.
- One RS-232 port.
- PS/2 keyboard support.
- Some sort of video output. Will decide when I get there. S-video and Composite or possibly VGA.
- IDE interface to be used for hard drives/CF cards and possible an LS-120 drive if the ATAPI isn't all that crazy.
- 8k DRAM somewhere in memory space because I'm insane.
- Some GPIO ports if I get around to it.
- Other stuff that I'm forgetting right now.
So what I have done so far is the CPU board, the 8k SRAM board, and part of a ROM board, currently populated with one socket and 8 lines of address decoding in 2k blocks. Currently using a 2k NVRAM for testing stuff. I have two 2k EPROMs that will likely end up here eventually. Pictures and stuff:
Naked mobo:
Its underside:
8k SRAM:
The bottom (about 340 solder joints
):
Running a test program to turn on the LED hooked up to the SOD pin:
NVRAM programming (without the NVRAM, apparently):
Testing the RAM board because something wasn't working somewhere:
