From: gerrit@laosinh.stgt.sub.org (Gerrit Heitsch)
Newsgroups: comp.dcom.modems
Subject: RE: Daughter Board for USR HST WANTED!!!
Date: Sat, 12 Dec 1992 15:25:42 MET
Distribution: world
Organization: Lao-Sinh project (private UUCP site)

In article <987856.2B25E11B@cmhgate.fidonet.org>, Adam Frix writes:

> SG> I have a HST with ASL made in 1991 and I want to add one of 
> SG> the v32 Daughterboards to my modem.
> 
> Only the round LED HSTs, and even then not some of those, can take the
> Rockwell v.32 daughterboard.  Yours is a square LED model with ASL, which
> absolutely can't take it.
A USR HST with square LEDs can't take the R9696, but you can add the
missing ICs and will get a real Dual with V.32bis. Normally you only
have to add the missing parts, the ROMs are the ones for the Dual and
the new features will automatically recognized.

Now the parts list:

Needed parts to upgrade a USR HST to a USR Dual

-----------------------------------------------------------------------
Part  # Description                   #  Price    # 

U 206 # DSP  TMS 320 C 25 FNL 33      # 108.32 DM # 
U 207 # S - RAM  P 5164 - 20  8 k * 8 #  20.08 DM # 
U 208 # S - RAM  P 5164 - 20  8 k * 8 #  20.08 DM # 
U 209 # 74 HCT 245                    #   1.18 DM # 
U 210 # 74 HCT 245                    #   1.18 DM # 
U 211 # 74 ALS 541                    #   1.98 DM # 
U 212 # 74 ALS 541                    #   1.98 DM # 
C 201 # SMD-C 100 nF                  #   0.11 DM # 
C 202 # 220 nF                        #   0.80 DM # 
C 203 # SMD-C 100 nF                  #   0.11 DM # 
C 211 # SMD-C 100 nF                  #   0.11 DM # 
C 214 # SMD-C 100 nF                  #   0.11 DM # 
C 216 # SMD-C 100 nF                  #   0.11 DM # 
C 217 # SMD-C 100 nF                  #   0.11 DM # 
C 218 # SMD-C 100 nF                  #   0.11 DM # 
C 221 # SMD-C 100 nF                  #   0.11 DM # 
C 222 # SMD-C 100 nF                  #   0.11 DM # 
C 223 # SMD-C 100 nF                  #   0.11 DM # 
C 224 # SMD-C 100 nF                  #   0.11 DM # 
R 201 # SMD-R 10 k                    #   0.03 DM # 
R 202 # SMD-R 10 k                    #   0.03 DM # 
R 204 # SMD-R 10 k                    #   0.03 DM # 
L 8   # Si-Br-Go-Bl-Si (colors)       #   2.75 DM # 
4 pcs.# IC-Socket 20 Pol. precision   #   1.69 DM # 
1 pc .# PLCC Socket 68 Pol.           #   4.98 DM # 
4 pcs.# IC-Socket 14 Pol. precision   #   0.90 DM # 

All prices are in DM because this upgrade was developed in Germany and
I have only translated the necessary things.
All together will make around 200 DM (~ $125)

To make the upgrade, you should know how to handle a soldering iron.
Static discharge can destroy ICs!!!

Every 8 k x 8 SRAM with an access time with 25 ns or less should
work. You need the narrow version. 
There are no problems to get the DSP in Germany, but I don't know
about the USA.

This partlist is very polular in germany, a friend upgraded 5 HSTs to
Duals and all are still working (now as Duals).

Remember: You will void your warranty, if you make this modifikation!!!

If you do it the wrong way and your modem is killed, thats your problem,
not mine!! The PCB used is a multilayer, be careful as you remove the
solder from the holes. Use only first quality parts.

This modifikation is only for personal use, not for commercial use!

Have fun with your new Dual...
 Gerrit

-- 
         Gerrit Heitsch  Moenchweg 16  7038 Holzgerlingen  Germany
  Logical adresses: UUCP: gerrit@laosinh.stgt.sub.org FIDO: (2:2407/106.9)
If we will ever be visited by Aliens, it will be very hard to explain, why a
 lifeform, that is intelligent enough to build atomic weapons can be stupid
   enough to do it. (taken from GEO special about space, page 88-91)
Newsgroups: comp.dcom.modems