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burning eproms in gwbasic

dnfocbdnfocb Posts: 5Member
i'm experimenting with burning eproms
and eeproms with gwbasic and very cheap
homemade programmers. i'm looking for
people and sites with info- like better
methods and timing specs for larger eproms
and 16 bit eproms.
is anyone else doing this?

Comments

  • melissa_may1melissa_may1 Posts: 937Member
    : i'm experimenting with burning eproms
    : and eeproms with gwbasic and very cheap
    : homemade programmers. i'm looking for
    : people and sites with info- like better
    : methods and timing specs for larger eproms
    : and 16 bit eproms.
    : is anyone else doing this?
    :
    :

    I used to use an EPROM programmer that I got really cheap. If I recall, it came with an 8-bit ISA card, with a cable out the back that ended in a ZIF socket. IT worked well, and was pretty cheap to buy.

    I stopped using it because it was only an 8-bit card, and I figured that newer computers would not work with it due to timing issues. It also only did smaller EPROMS, 16K or 32K I think.

    I also picked up a cheap EPROM eraser with it. It was only slightly bigger than an EPROM, and just turned on when it was plugged in to AC. No timer, no power switch. Just slide in an EPROM, plug it in, and watch your clock.

    Those were the "good ol' days"!!!




    [purple]Melissa[/purple]

  • dnfocbdnfocb Posts: 5Member
    sounds like one of those mct ones that jdr sold. they were cheap, but the new generation of homemade ones get down to about $3.

    the ones i play with are based on the epromr. if you build it with an experimenter socket, and use gwbasic software, you should be able to burn 16 bit eproms with an 8 bit burner and no adapter. just tie the data bits you are not burning hi and burn it as two 8 bit parts.
    i haven't tried this yet as i only use 8 bit eproms.

  • pagbofapagbofa Posts: 2Member
    : : i'm experimenting with burning eproms
    : : and eeproms with gwbasic and very cheap
    : : homemade programmers. i'm looking for
    : : people and sites with info- like better
    : : methods and timing specs for larger eproms
    : : and 16 bit eproms.
    : : is anyone else doing this?
    : :
    : :
    :
    : I used to use an EPROM programmer that I got really cheap. If I recall, it came with an 8-bit ISA card, with a cable out the back that ended in a ZIF socket. IT worked well, and was pretty cheap to buy.
    :
    : I stopped using it because it was only an 8-bit card, and I figured that newer computers would not work with it due to timing issues. It also only did smaller EPROMS, 16K or 32K I think.
    :
    : I also picked up a cheap EPROM eraser with it. It was only slightly bigger than an EPROM, and just turned on when it was plugged in to AC. No timer, no power switch. Just slide in an EPROM, plug it in, and watch your clock.
    :
    : Those were the "good ol' days"!!!
    :
    :
    :
    :
    : [purple]Melissa[/purple]
    :
    :

  • pagbofapagbofa Posts: 2Member
    unfortunately i dont have the computer of computers (theyre all trash
    as far as that goes) in front of me such that i could easily send you
    a schematic which allows you to program any chip. its sources currents
    from 5ma up to 100ma and provides Vpp voltages from 2vdc up to 30vdc.
    maybe some day the computer giants will make computers & software that
    allow easy replies to presently vague systems. have fun with your GW-
    Basic project, Melissa. from Peter Giannini . //

  • dnfocbdnfocb Posts: 5Member
    i like them simple. my current one programs 5 and 12.5v
    eproms with an experimentor socket, two counter chips,
    two transistors, and a AA battery.
    i think it is possible to do it without the transistors.
    i have burned up to 27c080 and flashed 29e020.

    my eeprom flash circuit is a 74ls138 decoder
    chip and a socket.

    is anyone out there doing this sort of thing in basic?

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