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Restoring vintage computers is sure to mean dealing with old EPROMs.   Many restorers have a modern EPROM programmer (i.e it was cheap, made in China and I got it on eBay) or two but there ...
... (E114).  I could see activity on the input (pins 9,10,12 and 13) but no activity on output (pin 8). Replacing E114 with a "new" 7440 sourced from eBay (with what appears to be a 1973 date ...
... KayPlus ROM worked but there were a few odd behaviours running some CP/M applications that needed further investigation. In May 2014 a Kaypro II was purchased from eBay by phorgen on the Vintage Computer ...
... out at the front of the chassis (but inside the plastic case) before it can get into the drive bay. An SD Card extender (available on eBay) was used to make the SD Card accessible outside the Model ...
... PCB and the metal chassis frame.  The cable comes out at the top of the Model 4 chassis and then attaches to the connector on the FreHD. An SD Card extender (available on eBay) was used ...
... with a logic probe shows that the values displayed on the front panel did match the data out pins on the M5303 UART suggesting a fault with the UART. The M5303 UART is still available from some eBay ...
... pin header problem was solved using headers from eBay and offsetting the header that connects to the Kaypro PCB socket from the sockets on the shim where the Z80 and 28C256 EEPROM are installed.  ...
... afterwards that this behavior would only occur with certain WD1771 chips. I have two different types... an original RS part that I got from Ian and some later "1982" NOS WD1771's that I got on eBay.  Only ...
... anyone who finds a parts donor Expansion Interface board and wants to get it going, as of 2013 the WD-1771 floppy controllers are still available on eBay as are the 4116 dynamic RAM chips.  Best ...
... and no problems reported.  The parts were ordered on eBay from electron-bg.  I would definitely order from this vendor again.      ...
... Zealand single board Z80 computer from a company called Computer Specialists so I borrowed the 8 4864 memory chips to test the upgrade.  If it worked I would hunt eBay for some chips. 4864 ...
... searching for a suitable external drive case.... and Trade Me (the New Zealand equivilent of eBay) turned up 70GB DLT drives for less than $10.   The DLT drive occupies a full height ...
With most computers no longer having a serial port, a TTL Serial / USB interface is required for many microcontroller projects. I have had good results with the low cost eBay modules based on ...
...  The end result looks very smart. The two serial interfaces use CP2102 USB/TTL Serial interface adaptors purchased on eBay for a couple of dollars.  They work well in this application easily ...
... Compact Flash to IDE Adaptor on eBay (approx US$ 2).   I have been testing the board with 2 x MAX3232 based TTL to RS232 converter boards.  Replacing these with CP2102 based TTL to USB Serial ...
After changing from using the Yaesu FT-817 protocol I picked the ICOM IC-725 as a reference having never seen one.  It seemed fairly representative of the use case for the DDS module as a generic ...
I converted the WB2V/AA0ED/AA0ZZ PIC 16F84 code for controlling the AD9850 to it runs on the PIC 16F628. The 16F628 is a lot cheaper (especially on eBay in lots of 10), has an internal ooscillator, ...
Test board for the cheap eBay DDS modules. The board is based on a design by WB2V with software enhancements by AA0ED and AA0ZZ. The cheap AD9850 DDS modules currently available on eBay are ...
The cheap AD9850 DDS modules currently available on eBay are a great starting point for a signal generator project but are a little short on documentation. The pinout and relationship to ...
... a try.     I looked at various online vendors and ebay sellers and decided to go with www.asiaradiosales.com - primarily based on the fact that their website looked fairly professional.  ...
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Contact Andrew Quinn

jaquinn@ihug.co.nz http://twitter.com/jaquinn