Re: TI-H: Internal memory expansion II

To: ti-hardware@lists.ticalc.org
Subject: Re: TI-H: Internal memory expansion II
From: tsaimelv@pilot.msu.edu (Mel Tsai)
Date: Fri, 14 Aug 1998 04:06:17 GMT
Delivered-To: ti-hardware-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <35D3AAF4.47B3B7F3@prairie.lakes.com>
References: <19980813123436.9551.qmail@hotmail.com> <35D3A25E.A94B8A23@prairie.lakes.com> <35d4a2eb.15070890@pilot.msu.edu> <35D3AAF4.47B3B7F3@prairie.lakes.com>
Reply-To: ti-hardware@lists.ticalc.org


>Um, yeah.
>
>Alot closer than an 85! (:
>
>85
>
> ||||||||
>.--------.
>|        |
>'--------'
> ||||||||
>
>86
>  __________
>=|          |=
>=|__________|=
>
>The TI-86 pins are on the sides and are super tiny. I forgot the type of
>package (TSOP or QSOP??? I can't remember, My books aren't here, and I never
>remeember those ;)

That's a TSOP configuration, i.e. 0.5mm pin spacing, i.e. a bigass
beotch to solder.

>The TI-92 uses the exact same chip, and I want to do that TI-92 memory upgrade
>that actualy does increase the memory (not two banks selected by a switch). I
>can't though, since I can't possibly imagine to solder those pins (much less
>the individual wires that the instructions say to wire to the ROM port and circuitboard!)

Making the PCB is much more difficult than soldering the chip.  It's
just about impossible to make the 0.3mm traces needed to route TSOPs
by hand.  

-mel

References:

TI-H: Internal memory expansion II

From: "marcel groenendijk" <m_groenendijk@hotmail.com>

Re: TI-H: Internal memory expansion II

From: Richard Piotter <richfile@prairie.lakes.com>

Re: TI-H: Internal memory expansion II

From: tsaimelv@pilot.msu.edu (Mel Tsai)

Re: TI-H: Internal memory expansion II

From: Richard Piotter <richfile@prairie.lakes.com>