enito Posted September 9, 2017 Share Posted September 9, 2017 (edited) Hi, i want to install my old purchased sloopy vbxe, in my 65 XE. But i see is a bit diferrent of the ones i see in installation instruction. Apprenly is 1 bit version, but dont see the Q4 for remove, i know i have to install the crystal in the vbxe. Any can guide me please? Thx!! Edited September 9, 2017 by enito Quote Link to comment Share on other sites More sharing options...
+tf_hh Posted September 13, 2017 Share Posted September 13, 2017 To install this model in your XE, you´ve to remove the crystal (Y1) from your XE mainboard and put it on the VBXE PCB (X1). Then go ahead with the installation of IRQ, CAS_INH and EXTSEL at J3 (VBXE) to the points on your XE described in the manual (see attachment) The 14 MHz output must connected to Freddy pin 2 coming from pin 3 / J6 (VBXE). Finally remove these both parts (it´s enough to bend up one side of each part): Important: If your 65XE model hasn´t an ECI port, then EXTSEL might be connected directly to +5V - this can kill the FPGA on VBXE - see attached manual, installation XEGS. There´s explained what to do. Jurgen VBXE_V2.0.zip 1 Quote Link to comment Share on other sites More sharing options...
enito Posted September 13, 2017 Author Share Posted September 13, 2017 Hi, really thx for this excelent explanation!!!!right i remove first diode, and of the right side second diode , and 2 resistor? or only the 1? In the back side of my vbxe in x1 area, are missing the c24,c25 smd caps, need to be placed the 22pf? thx!!! Quote Link to comment Share on other sites More sharing options...
+tf_hh Posted September 13, 2017 Share Posted September 13, 2017 The left red circle I marked is L34, this is an inductor (black). The right red marked circle is a resistor with the value of 240 ohms (color rings red-yellow-brown and gold). You can click on the image to enlarge it, I didn´t resize it - to see better what I mean. Your 65 XE model isn´t equal to the ones in the explanation / manual! This 65 XE mainboard you have was a precessor of the well-known XE mainboards. If you take a look at the bottom side (solder side), you will find the marking "900 XL" on it. And the arrangement of chips are more compatible with a 800 XL mainboard than the standard 800/130 XE mainboards. Quote Link to comment Share on other sites More sharing options...
enito Posted September 13, 2017 Author Share Posted September 13, 2017 Hi i see, right a very special model mine hehe !! and about c24 and c25 missing in my board, necessary? again thx! Quote Link to comment Share on other sites More sharing options...
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