I have a PCB5.0c and the 16bit adapter. I can read them but I cant progam them? Im using the USB for power, I also tried a 12v 1amp adapter. All the jumpers are set as shown in the software. Any help would be greatly appreciated!
first usb volts isnt enough for older eproms you need +vcc supply also i think 12v is fine on the plug remove the usb power set the jumpers for 12v power lower right of the boards...
you also need to remove the jumper on the voltage select pins J8 on the right to allow 6.250v as vcc when applying programming volts of ~12vpp it says
. 5v6 . com . 5v
but remove it its ~6.250v perfect for 27cxxxx or 27xxx i made this mistake
i adjusted the block for switches and jumpers as per
then tried to program and no error till it varified then blocks failed
it says nothing about it but J8 you need to basicaly remove just park it on the middle pin for vcc=6.250v {program level of any...27c series where 27xxx need vcc=6.000v you can use the same 6.250v its ok... i suppose} then youll get the correct programming volts
simply unlike automated units this is why this programmer works
for me anyway.... one of the best tools i bought for $18 free post...
i dont mind the 'real' parallel port i have a few of them
never throw a computer 'away'
machine toshiba equium laptop usb only type p5b asus main machine thinking of adding dual lpt pci card both used for top and lpt via usb where i can
old p2 programming grumbling tank with xp sp3 for true serial and lpt
all machines bios set to enable bios plug and play aware o/s and lpt spollers services and drivers removed legacy detection enabled
place fresh eproms in the freezer for 15 mins first before programming it weights there memory cells heavier with electrons inside them when you program becouse less of them escape as things are cold they will leave a zone less readily leading to a stifer image on reads over a vcc range and less electron leekage on program runtimes...
so... better to freeze first but also blank check first before freezing
machine toshiba equium laptop usb only type p5b asus main machine thinking of adding dual lpt pci card both used for top and lpt via usb where i can
old p2 programming grumbling tank with xp sp3 for true serial and lpt
all machines bios set to enable bios plug and play aware o/s and lpt spollers services and drivers removed legacy detection enabled
STill no luck.. I removed Jumper on J8 and left it empty, I set the jumper on bottom right to VCC and used my 12v power source. I still get an error immediately on programming?/
what is the error please specify it ??? is it write failure is there an address
???
you maybe didnt follow rules
for eprom blank them test blank freeze for 30 mins then blank check again then program using 6.250 @ <=100ns = 100us delay or >=~120ns = 200us delay and delay/4 = sub delay if you blank check @ 5v and 6250 ok,,, then fill then buffer with 00 and varify this ensures first byte reading this can check two states i find so.. sometimes the software doesnt check a disconected vpp pin om in read but write fails on the first byte or two etc
i clean the pins with a burnish pencil first to ensure connection as only write uses this pin on the eprom in question
machine toshiba equium laptop usb only type p5b asus main machine thinking of adding dual lpt pci card both used for top and lpt via usb where i can
old p2 programming grumbling tank with xp sp3 for true serial and lpt
all machines bios set to enable bios plug and play aware o/s and lpt spollers services and drivers removed legacy detection enabled
or eprom blank them test blank freeze for 30 mins then blank check again then program using 6.250 @ <=100ns = 100us delay or >=~120ns = 200us delay and delay/4 = sub delay if you blank check @ 5v and 6250 ok,,,
you also need to remove the jumper on the voltage select pins J8 on the right to allow 6.250v as vcc when applying programming volts of ~12vpp it says
. 5v6 . com . 5v
but remove it its ~6.250v perfect for 27cxxxx or 27xxx i made this mistake
i adjusted the block for switches and jumpers as per
then fill then buffer with 00 and varify this ensures first byte reading this can check two states i find so.. sometimes the software doesnt check a disconected vpp pin om in read but write fails on the first byte or two etc
i clean the pins with a burnish pencil first to ensure connection as only write uses this pin on the eprom
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Trouble with 27c160s
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Posted - 11/15/2009 : 12:06:35
