[Coco] SuperIDE / HDB-DOS and physical floppies question

[Steven Hirsch]

On Wed, 11 Jul 2012, tonym wrote:

> EPROM+ unit at arlabs.com?

That's the one.  I cannot say enough good things about the company. 
Support is excellent and they provide schematics and calibration 
information for the programmer and personality modules.

Best yet:  You can buy bare boards for most of the adapters and build them 
yourself.

Steve



> ---- Original Message ----
> From: "Steven Hirsch" <snhirsch at gmail.com>
> Sent: 7/11/2012 6:10:20 PM
> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
> Subject: Re: [Coco] SuperIDE / HDB-DOS and physical floppies question
>
> On Wed, 11 Jul 2012, tonym wrote:
>
>> I was thinking of maybe splurging for one of these:
>>
>> http://www.ebay.com/itm/Willem-EPROM-Programmer-Pro-Version-PCB-ver-5-5-PIC-/150853071132?pt=LH_DefaultDomain_0&hash=item231f8b311c
>>
>> No switches, all software... Or maybe a USB variant:
>>
>>
>> http://www.ebay.com/itm/NEWEST-PCB6-0-USB-Willem-EPROM-Programmer-PIC-BIOS-AVR-Ship-from-USA-/310412788418?pt=LH_DefaultDomain_0&hash=item48460b42c2
>>
>
> The latter one might be a safer bet unless you're sure you'll have a box
> with a parallel port around for the near future.
>
> Also, the Willem units really fall on their faces trying to program older
> NMOS EPROMS that require 21V and 25V Vpp.  These include 2708, 2716, 2732
> (not the 'A' version).  There's a DC-to-DC converter that kinda, sorta
> tries to boost the +5V power up to the requisite level, but it's very shy
> on current capacity and does not do a robust job.
>
> I modded mine with a relay and external power input for the older parts
> before mothballing it in favor of an Andromeda unit (needed to program
> bipolar PROMs).
>
> Steve
>
>
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