Uploaded December 2023 | Updated September 2026, 3 weeks ago
Did you ever wish your vintage H8 8-bit computer ran MS-DOS? Probably not... but what if you did? In this video, I upgrade my H8 computer from its stock 8080 CPU to a 16-bit 80186 CPU. This is an upgrade from 2MHz to 25Mhz, and an increase in the memory bus width from 8-bit to 16-bit. The retrobrew SBC-188 was the basis for this design, which I modified to use the 80186 with its 16-bit data bus, and glued it to the Heathkit H8 "Benton Harbor" bus. In the video I demonstrate integration with some of my other boards, including an SP0256A-Al2 speech synthesizer, a VDIP1 USB module, and an H8-4 serial board. Some DOS software works fine, but some software will require true IBM PC compatibility and not work so well. Oh, and we die in Zork and play some Galactic Warezone too! For more vintage computer videos, see smbaker.com
Did you ever wish your vintage H8 8-bit computer ran MS-DOS? Probably not... but what if you did? In this video, I upgrade my H8 computer from its stock 8080 CPU to a 16-bit 80186 CPU. This is an upgrade from 2MHz to 25Mhz, and an increase in the memory bus width from 8-bit to 16-bit. The retrobrew SBC-188 was the basis for this design, which I modified to use the 80186 with its 16-bit data bus, and glued it to the Heathkit H8 "Benton Harbor" bus. In the video I demonstrate integration with some of my other boards, including an SP0256A-Al2 speech synthesizer, a VDIP1 USB module, and an H8-4 serial board. Some DOS software works fine, but some software will require true IBM PC compatibility and not work so well. Oh, and we die in Zork and play some Galactic Warezone too! For more vintage computer videos, see smbaker.com
![Raspberry Pi 4: [Part 1] Does it need a fan? Whats the best fan?](https://i.ytimg.com/vi/IkhNzLVrXJQ/mqdefault.jpg "Raspberry Pi 4: [Part 1] Does it need a fan? Whats the best fan?
Ive recently purchased some Raspberry Pi 4 and wanted to use them in some projects. It runs hotter than my old Raspberry Pi 3. I spent some time evaluating the temperature under load and trying out various fans to see how much fan RPM is necessary to produce a noticeable reduction in CPU temperature. I ended up settling on a 4-pin fan from delta electronics that easily allows fan speed to be controller from the raspberry pi and RPM to be read back. This fan is only 7mm thick making it ideal for fitting inside a relatively tight raspberry pi case. The fan part number is ASB0305HP-00CP4 and I bought it for just under ten bucks from digikey (digikey part number 603-2070-ND). Being able to control the fan speed easily from the pi is a great feature, as most of the time you dont need a noisy screaming fan at 9500 rpm. Something as low as just 1500 rpm may do. Thats if you think you need a fan at all. For more electronics stuff, see http://www.smbaker.com/")
