Diacom plus on Pentium laptops

[TBK]

Hi Ken,

The varying logic levels is easy. It's the data format. I couldn't get the
uart to frame the C3 data correctly. I would have need a bunch post software
processing.  I decided it was easier to just do all of it in hardware. 160
baud is not that fast. Plenty of time available.

Considering the clever timing routines in Diacom, I am surprised at Rinda's
comment. I guess they did some software timing loops somewhere. But I did
run it on a 450MHz machine playing around and it worked (desktop, not a
portable). Could be related to the keyboard interrupts too.

I think I've beat this to death! Back to DIY-EPROMS..............

TK

-----Original Message-----
From: Ken Kelly <kenkelly at lucent.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Wednesday, July 29, 1998 6:26 AM
Subject: Re: Diacom plus on Pentium laptops


>TBK,
>
> I believe you are correct on the 4 interfaces that Rinda is
> compatible with, but the Diacom cable would have to have a
> -10 to -12 volt supply to be able to create an RS-232
> signal. The Maxim chips now make that easy, but I don't
> think they were available when Rinda started the Diacom. Do
> you really think the Rinda cable attempts to actively shift
> levels? I thought the circuitry just shifted the pinouts
> around for the various standards.
>                 Ken
>
>TBK wrote:
>>
>> The C3 uses either the CE lamp (12V) or Serial 160 output 5V. P4 8192 is
5V.
>> The Diacom cable buffers the signal, so output voltage is not the reason
>> they use the parallel port. It is the best way to simulate a software
uart,
>> control the DIAG line modes and talk to three different hardware systems:
>>
>> C3 CE lamp
>> C3 Serial 160
>> P4 Serial 160
>> P4 8192
>>
>> Rinda crammed all of that into the circuit board in the cable.
>>
>> -----Original Message-----
>> From: Ken Kelly <kenkelly at lucent.com>
>> To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
>> Date: Tuesday, July 28, 1998 1:15 PM
>> Subject: Re: Diacom plus on Pentium laptops
>>
>> >The Diacom software runs on the Parallel port so it doesn't
>> >use a Uart. They use the Parallel port because the ALDL port
>> >does not have RS-232 voltages. You must use a level
>> >converter to convert the 0 to 5 volt signal to +/- 10 volts.
>> >Diacom uses the serial data link in the Parallel port
>> >because it has 0-5 volt levels. They do there own timing
>> >control.
>> >
>> > Ken
>> >
>