Notes for Programming EPROMS using Electronics Australia kit (Dick Smith kit)
with Eprom.exe software:
Eprom types suitable for use: 2764 (21-25 V pgm), 2764A (12.5 V pgm) or other
27x64-x EPROMs.
Set device switch on programmer
Set Vcc = 5V
Connect programmer, insert EPROM and turn on.
Select:
Vpp = 12.5V, write pulse 1ms, 1 pulse per byte, final pulse = 0, EPROM multi
pulse. If this does not work, then try:
Vpp = 12.5V, write pulse 10ms, 1 pulse per byte, final pulse = 0, standard EPROM
single pulse. If this does not work, then try:
Vpp = 12.5V, write pulse 50ms, 1 pulse per byte, final pulse = 0, standard EPROM
single pulse. If this does not work, then try:
Vpp = 21V, write pulse 1ms, 20 pulses per byte, final pulse = 0, EPROM multi
pulse. If this does not work, then try:
Vpp = 21V, write pulse 50ms, 1 pulse per byte, final pulse = 0, standard EPROM
single pulse. If this does not work, then try:
Vpp = 25V, write pulse 50ms, 1 pulse per byte, final pulse = 0, standard EPROM
single pulse.
When comparing binary files using DOS command ‘FC’, don’t forget the binary code
output from FPP contains the date; two identical personalities may not match
using FC due to the different date encoded into the binary file, at locations
1FE2, 1FE3 & 1FE4 from the start of the file, and the checksum, see note below.
Location 1F64 appears to be a data checksum for the whole data stored on the
EPROM.
Philips FM92E Conversion to 6 Meters: Version 3.9 Page 76
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