Help!

A classmate and I are making a PIC16f877 programmer as a project in one
of our courses and we've run into a problem. The PIC will not let us
read data (properly) or advance the program counter while in program
mode. Here are the steps we go through to program a location:

0. Issue a Bulk Erase Programing Memory
1. Reset the PIC by keeping RB6 and RB7 low and then bringing MCLR from
0v to 12.5v
2. Issue a Load Data for Program Memory command (6 clks) followed by
clocking in the data (16 clks)
3. Issue a Begin Erase Programming Cycle command (6 clks)
4. Issue a Read Data From Program Memory (6 clks) to see if the data
went in properly
5. Change our Data Out to High Impedance
6. Issue 16 clks to read the data from the PIC

What comes out from the PIC (during these 16 clocks) is not what we
programmed. It is all 1's.

Now, if we perform a reset (ie step 1) and issue another Read Data From
Program Memory (ie steps 4 through 6) we receive the correct data that
we entered in!

Further more, if we try to program the first two memory locations ie:

1. Reset the chip
2. Issue a Load Data For Program Memory
3. Issue a Begin Erase Programing Cycle
3. Clock in some data
4. Issue an Increment Address
5. Issue a Load Data For Program Memory
6. Issue a Begin Erase Programing Cycle

Then reset the chip. We can read back the first location ok however the
second location does not give us our data. Again it is all 1's.

Any help would be greatly appreciated. Please try to respond to
jakeszot@home.com as I don't know if I will be able to monitor this
list for responses.

Thanks!

-Jake