Re: DirectScan "RAM Scan Tool"

[DC Smith <morepoweral@tetranet.net>]

I use direct scan on my turbo regal. It is FAST and a really nice scan
tool, IMO. Uptades at up to 18 frames per second. I had to slow mine
down to 4 FPS to be able to read the numbers. :)

Peter Gargano wrote:
> 
> Someone just purchased the DirectScan Unit. It's described here:
> 
>   http://www.chuengineering.com/
> 
> and you can get the details on it as a PDF file from:
> 
>   http://www.chuengineering.com/manual.pdf
> 
> Reason I mention this is that someone was kind enough to send me
> a scan of the unit's 10 chip (74HCxxx) PCB.
> 
> The unit plugs into the ECM's PCB edge connector where address,
> data, and some control signals are available. DirectScan has RAM
> (62256) and address multiplexers (4 x 541 tristate buffers),
> and some simple logic (257 mux, 590 counter, etc. to enable the
> PC's parallel port to read the RAM - and that's about it.
> 
> The unit's RAM "mirrors" the ECM's RAM, but it's not dual
> ported (in the sense that while the PC is reading the RAM, the
> RAM is not being updated). The other circuitry lets the PC read
> the RAM - nyble by nyble. The rest of the package is the software
> that interprets the RAM.
> 
> Neat, eh! More expensive that some ALDL scantools, but certain
> benefits exist!
> 
> Peter.
> ----------------------------------------------------------------------------
> To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> in the body of a message (not the subject) to majordomo@lists.diy-efi.org

-- 
***********************************************************************
Dan Smith      84 Regal   11.841@115.09     GSCA# 1459
St.Charles, Missouri 
mailto:morepoweral@tetranet.net               
http://www.tetranet.net/users/morepoweral
***********************************************************************
----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo@lists.diy-efi.org