eepromgrammer

Too complex setup and  sensible to wrong selects at dip switches. Doing a review.

Still waiting components arrive.

Going to make a prototype for 64kb FLASH or EEPROMS, without high voltage operation ( 12.5V erase and 14.3V program), with dual serial bus, for address with three 74hc595 and for data with a 74hc595 and a 74hc165.

todo: support for high voltages, also SPI and I2C FLASH chips.

Done small changes:

No more choice to use high address A16-A23, all bits goes for address A0-A23 by the shift registers.

Support for A27E257 eeprom 32kx8bits, changed dip-switches setup, as pin 1 is VPP, 12.75V to program, or VPP2, 14V for erase, and pin 28 is VCC.

New schematics v03.

Circuits for VPP and VPP2 not included.

the software will be based on:

(this list could grow :)

https://github.com/beneater/eeprom-programmer

https://github.com/daveho/eeprog

https://github.com/TomNisbet/TommyPROM

As reference pinout for ZIF socket, prefer AT27C040:

Considering the first 8 pins ( 1, 2, 3, 4, 37, 38, 39, 40) reserved for I2C and SPI, then changes are:

PS. NC for not connected and X for must be, GND included for mark.

the schematics altered to comply.

dip switch 01 and 02 for eeproms:

to review:

AT28C16, (01 ON: S6, S8, S9), (02 ON: S3)
AT28C64, (01 ON: S2, S4, S7, S9), (02 ON: S3)
AT28C256, (01 ON: S2, S4, S7, S9), (02 ON: S4)**
SST39SF040, (01 ON: S1, S3, S5, S7, S9), (02 ON: S3)
M27C512, (01 ON: S2, S3, S5, S7, S10), (02 ON: S3)
W27E257 to review
AT24CXXX ALL OFF.

update:

for W27E257  pin 1 is VPP and pin 28 is VCC

Top 8 pins

The top 8 pins pins-outs of zero-insertion-force (ZIF) socket, are reserved for I2C and SPI, : with follow setup.

OBS.

pull-ups 4k7 resistors at (S1, S2, SDA, SCL, WR) and pull-down at S0.

I2C or SPI must be select for use, or go in tri-state.