EPROM Programming Shopping List

[zephyr]

I have a small multi-voltage (selectable from 3v to 12v), 1500mA (max) regulated power supply. Would this be suitable for use with the programmer?

[KenH]

This power supply should be fine.
Here are the user's manuals for this programmer.
http://www.shrubbery.net/~heas/willem/w ... om-Eng.pdf
http://www.busfoto-nederland.eu/kwong/d ... lemQSG.pdf

[zephyr]

I'm using Windows XP Pro, SP3. Does it really need the parallel port IO driver from-- http://www.driverlinx.com/ftp/unsupported/port95nt.exe (no longer available via that link) mentioned in the Quick Start Guide?

[KenH]

I'm using Windows XP Pro, SP3. Does it really need the parallel port IO driver from-- http://www.driverlinx.com/ftp/unsupported/port95nt.exe (no longer available via that link) mentioned in the Quick Start Guide?

No. If you're using XP Pro and your PC has a parallel port you don't need any driver.
Just install the EPROM software. I'm using this version: http://www.sivava.com/Software/MCUsetup97ja.zip

[zephyr]

Thanks Ken!

[zephyr]

A few questions for Phill (prime) or anyone else that can answer them:

I have just acquired some AMD AM27C128 EPROMs with an access time of 150ns.

(1) Are these suitable for the Dragon 64?

(2) What are suitable EPROM access times for the Dragon 64?

(3) Which EPROM chips would be suitable for use as a direct replacement for the original Dragon 32 ROM chips?

[zephyr]

Would AM2732's or 27C32's be OK for the Dragon 32?

[zephyr]

Ken, The original EPROMs in my Dragon 64 are HN4827128G's. Is this programmer capable of programming the HN6827128G's and the 24 pin AM2732's mentioned above?

If not, which of the excellent Willem models would I need to buy?

[KenH]

Hi Steve,
Regarding your previous question, I'm not an expert on this issue, but I believe that any EPROM rated at 200ms or faster would work fine.
The AM27C128 150ms will surely be fine.

Ken, The original EPROMs in my Dragon 64 are HN4827128G's. Is this programmer capable of programming the HN6827128G's

The HN4827128G is a 27128 EPROM manufactured by Hitachi. However it's an older EPROM with a programming voltage of 21V vs. 12V in "newer" 27128 EPROM.
I'm not quite sure if the Willem supports 21Vpp programming. The specs say "21Vpp Modify Circuit" which I guess means you somehow need to mod the programmer's circuit.

Rather than buying a programmer that supports 21V eproms, its may be easier to find 12Vpp programmable eproms. Note that all these EPROMS use 5v for data reading, so they will work equally well on your real Dragon.
Search for the EPROM's datasheet and you will find its programming voltage listed there.

and the 24 pin AM2732's mentioned above?

Hmmm...
These are 25Vpp. You could probably buy a more expensive programmer that supports 21 & 25 Vpp
Like this one: http://www.mcumall.com/comersus/store/c ... oduct=4282


Another possibility would be to get (or build) a 24pin to 28pin adapter and user 12Vpp 28 pin EPROMS. You'll get the extra benefit of a dual rom device.
Cloud9 has such a product: http://www.frontiernet.net/~mmarlette/C ... apter.html It's advertised for dos but will also be OK for the Dragon 32's ROM.

[robcfg]

I've run out of 27128's but I have a couple 27256's at hand. Can I use them for the Dragon?