Alexy,
Thank you so much for the part numbers. The need to use serial2usb dongles (the obtaining of drivers for which has been problematic at best, especially on the mac) has been a constant headache.
When use use these modules, isn't there a host side driver required to support the specific USB device? Please what do you use as a terminal emulator.
I have pondered the use of serial to ethernet devices, but those can be pricey and often come with odd drivers as well.
Thanks Douglas Douglas,
I did not mean to say that the power supply problem with Zeta doesn't exist (obviously I don't know that having seen just one Zeta), only that I did not have that particular problem with my configuration. I am sorry if I sounded dismissive of the issue.
For DB9-USB-M, DB9-USB-M is the actual manufacturer part number. Mouser part # 895-DB9-USB-RS232-M, Digikey part # 768-1064-ND, Newark part # 76R7016.
Alexey On Saturday, June 30, 2012 10:10:56 PM UTC+4, douglas_goodall wrote: Alex,
In regard to your note #1, Please do not discount the experience of many people who have had power troubles with their Zeta's. The fact that you have not yet had the experience is no reason to disparage the veracity of others. This is a known and ongoing problem the answer to which is not denial. This trouble seems to manifest in dual drive systems and has to do with the power surge that occurs when the floppies start up.
In regards to note #3, do you have a part number or a link to a datasheet, I am not familiar with this part.
Thanks Douglas
On Jun 25, 2012, at 6:20 AM, alexcp wrote: Hello, I just built myself a Zeta SBC and it is working perfectly! Looking at the crop of Zetas in this group, it seems to be a successful design - compact and inexpensive, easy to build, and functional. Thank you Sergey!
Some notes:
1. Zeta is not as power sensitive as some people reported here. It works without a glitch (together with a Samsung 3.5" floppy drive, rated at 0.7A), from a simple 5V, 1A SMPS wall wart. Zeta itself consumes about 0.16A (the Z80 runs at 10MHz, all ICs except the FDC are CMOS).
2. I did not get the floppy working the first time, because I was confused by the FDC_INT/NMI silk next to the jumper JP3. I assumed INT is on the left (looking from the board's edge) and NMI is on the right. Wrong. For INT, the jumper must be on the right side, and in that position the floppy works flawlessly. It also works without the jumper (i.e. with open pins).
3. I replaced the DB9-M connector (P3) with FTDI's DB9-USB-M module. The module fits a standard 9-pin DB9 connector footprint and has a standard USB mini-B connector. It saved me from the inconvenience of not having a real serial port on my desktop computer.
4. Zeta runs WordStar and Turbo Pascal from good old days!
--- Douglas Goodall Santa Maria, CA
"Even a blind pig finds a truffle now and then" oink oink!!
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