Byteblaster II hardwareBasically it is Altera ByteBlaster II interface with added socket and 3v3 regulator for power supply to the device. In future i"ll add willem/ezo hardware support... Schematics and PCB layout for in download section.

Schematics and pcb layout:
Image removed. Schematics
Warning! SO data line need pull-up resistor (not placed on schematics), SO data line splits into two nets so please use wire to jumper it (pin 7 of JTAG connector with pin 2 of DIP8 socket)
For improoved compatibility with MX and SST device fafmilies do the following modification:Cut the trace leading to pin #20 of 74hct244 chip, reconnect it using jumper wire with pin #8 of 25xx DIP8 socket


Testing the hardware

Start with connecting the programmer to regulated power supply (anything that gives 8-15V DC will be OK, current consumption of programmer and programmed device is marginal).
Download Parallel port monitor freeware from Geek"s hideout web page and run it.

toggle pin 7 - D5 - pin 10 should change its state
toggle pin 9 - D7 - pin 12 should change also its state
pin 13 and 15 should be green when hardware is connected, but might bediffrent if any chips are put into the socket

if this test passes, then you"ve working hardware, and should not worryabout the "hardware not present" issue