[sebhc] Re: Great Idea for IDE MORE!! STATUS -- chips used

[Barry Watzman]

Check out some of the articles and ads in "Nut and Volts", an electronic
hobbyist publication.  There are companies that have products (hardware and
software) for the "Stamp" and robotics enthusiasts that they claim make USB
extremely simple.


-----Original Message-----
From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of
Bob and Bettina Groh
Sent: Wednesday, September 20, 2006 6:14 PM
To: sebhc at sebhc.org
Subject: Re: [sebhc] Re: Great Idea for IDE MORE!! STATUS -- chips used

I sort of wondered about the software side of things. I thought of adding a
USB 
interface to the H89 but rapidly came to the conclusion that writing and 
debugging the software driver would be a major undertaking. Given how little

work I get done anyways, the idea was put aside. Sounds like the IDE
interface 
might fit in the same boat. Wish I knew more about it - it would be nice to
be 
able to add some of the old hard drives to an H-89 et al.  Sigh.

Bob Groh

Lee Hart wrote:
> bill malcolm wrote:
>> HI:  this uses  the following chips
>> 3  74hct32
>> 1  74hct08
>> 1  74hct04
>>
>> This design is not mine -- I found this used for the apple II & would
>> be easy to use with the Z-80.
> 
> The parts count looks suspiciously low. The GIDE circuit worked out by 
> Tilmann Reh is quite complicated, because it supports 8-bit and 16-bit 
> IDE devices (and almost all IDE devices are 16-bit). The Z80 basically 
> has to output the low byte, then the high byte, then the write command, 
> saving each part in latches. The reverse needs to be done to read; issue 
> the read command and capture the 2 bytes in latches, then read the low 
> byte latch, then the high byte latch.
> 
> I have the circuit for Mike Riley's IDE interface for an RCA 1802 
> computer. It uses 3 ICs; one 74LS32, one 74LS04, and one 74LS75 4-bit 
> latch (for the command); but it requires IDE devices that support 8-bit 
> mode.
> 
>> Boot code is needed  for this device
> 
> With the GIDE interface, it took *years* before anyone got around to 
> writing any software to actually make it work. When they did, each 
> person typically wrote a driver for their specific IDE device that did 
> not work with any other. The market being what it is, almost no one else 
> could find the same model hard drive, nor figure out the guy's code to 
> modify it for something else.

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