Hah, all of my own boards get to about v 12 before I'm mostly happy, and then continue polishing for several more. It's almost like software, never really done.
bkw On Sun, Nov 19, 2023, 7:56 PM Stephen Adolph <twospru...@gmail.com> wrote: > I jumped the gun a bit, needed to redo the boards and change the circuit. > > On Sunday, November 19, 2023, Brian K. White <b.kenyo...@gmail.com> wrote: > >> None of the file links work, but I'm sure it *will* be awesome. >> Sounds super. >> >> On 11/18/23 10:54, Stephen Adolph wrote: >> >>> Hi everyone, >>> >>> I've been working towards finishing off my project for increasing the >>> speed of the Model T laptops. The idea is to create a (relatively) easy to >>> make and install solution that allows the user to switch the clock rate >>> from 2.5 MHz to 5 MHz. >>> This is really nice on the 40x8 LCD machines. >>> >>> The universal software command to switch clock rate is >>> OUT 85,1 for 2x mode and >>> OUT 85,0 for 1x mode. >>> >>> Of course the Model T is not designed for this, but in my experience so >>> far, it seems reliable. I really like the upgrade and plan to install in >>> all my laptops. Being able to operate in nominal clock mode is of course >>> very useful because you may find some software to be incompatible. >>> >>> Models I have upgraded to date: >>> * M100 (NA, early variant, not UK) >>> * T102 >>> * T200 >>> * NEC PC-8201/8201a >>> * Olivetti M10 >>> >>> I am publishing all the information needed to DIY this upgrade. I don't >>> have any plans to make these upgrades. Consider this upgrade only if you >>> are comfortable with soldering surface mount parts, and with making minor >>> modifications to your laptop. >>> >>> Upgrades that are done and in the process of documentation are M100, >>> T200, NEC. Upgrades that need a new PCB design still are T102 and M10. >>> All information will be at this site: >>> >>> https://bitchin100.com/wiki/index.php?title=5MHZ_upgrade_for_Model_T < >>> https://bitchin100.com/wiki/index.php?title=5MHZ_upgrade_for_Model_T> >>> >>> I am publishing >>> * PCB designs for the clock doubler board (there are a few variants) >>> * schematic >>> * bill of materials for parts you need >>> * documentation for building the clock doubler >>> * installation documentation per laptop >>> >>> Things I have discovered while developing this; >>> 1. Power consumption goes up by about 20% when you run at 2x clock. >>> 2. Depending on the speed of your SRAM, you may need to implement a >>> modification to speed that up. Each model has a specific mod you need. >>> 3. In M100 with the custom socket pinout, in most cases you need to >>> upgrade your Main ROM to something faster. This usually involves an >>> adapter board and an EPROM. >>> 4. In the Tandy 200, one must slow down the machine temporarily to >>> access the RTC. There is a specific change for that. >>> >>> Anyhow, as I complete a particular laptop, I'll post the needed files. >>> >>> Hopefully this will be of some interest for those inclined to play >>> around with hardware. I have no problem if anyone wants to take the design >>> and improve it or change it. >>> >>> Feel free to contact me directly with questions. >>> >>> cheers >>> Steve >>> >>> >>> >>> >>> >> -- >> bkw >> >>
