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| very simple 68k tini board |
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| amymcneil:
Board design is completed. I tried to be as faithful to the original design of DiTBho's SIMPLE-68008 as I could. There are a few differences though. 1) The board is a 4 layer design, inner layers are VCC and GND. 2) The memory configuration jumpers are now 3 pin headers on the top side of the board. 3) The power input is a screw terminal block rather than a header. All component designators are the same, the component locations are in approximately the same locations as the original design. The I/O headers have the same pin out. Board size is 3.75" square. Mounting holes are 0.156 dia through hole with 0.250 isolated pad, the holes are 0.20 from each edge, 3.35 on centers. I've attached PDFs of the schematic and the board layout. I should be sending the job out in a day or two, to have a few boards made to test the design and confirm that I haven't made any mistakes in my transcription of the original design. Chips are sitting on the shelf waiting for boards. Comments and suggestions are welcome. |
| DiTBho:
Looks great!!! :D |
| amymcneil:
Boards arrived. I need to order a few parts like sockets and capacitors. I had fun laying this out, it has been a very long time since I've done a board design that was all through hole components, my projects these days are mostly surface mount. Photo of bare board attached. |
| wilfred:
--- Quote from: amymcneil on October 15, 2024, 03:11:27 am ---I meant to add - if someone (OP?) has boards available, I would like to buy one. Will save me some work and I can get on to hacking MC68000 assembly sooner! Thanks! --- End quote --- You could do that on an emulator, Yeah, I get it, not the same. |
| amymcneil:
--- Quote from: wilfred on Yesterday at 10:15:20 pm --- --- Quote from: amymcneil on October 15, 2024, 03:11:27 am ---I meant to add - if someone (OP?) has boards available, I would like to buy one. Will save me some work and I can get on to hacking MC68000 assembly sooner! Thanks! --- End quote --- You could do that on an emulator, Yeah, I get it, not the same. --- End quote --- Yeah, I know. And it's a lot less money, too. But.... I've never enjoyed using architecture emulators for old hardware. Something about the "vibe" if that makes sense. The emulator is just another application on a modern PC, rather than a board that I can point to and say "that's the computer I'm working on". I enjoy the hardware side since my current day job involves writing Linux device drivers and support utilities for proprietary custom hardware implemented in a Xilinx FPGA. While the whole write "code" as a description of the hardware, compiling it and downloading the bit stream to the FPGA is very cool, there isn't the same satisfaction that comes from slaving over a hot soldering iron for a couple hours and holding your finished hardware in your hand(s). I have two other ancient architecture computer projects that I'm collecting parts for. One is a TMS9900 based machine, the other is a PDP8 implemented using the HD 6120 Intersil/Harris chip, along the lines of the Spare Time Gizmos SBC6120. I'll post something about these as I get further along. Both of these are architectures that I've wanted to play with for many years. And both are odd enough to be interesting. |
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