Switch info for 486 and p1 MAGITRONIC laptops (7500A & 7600)
lap...@info.net
reference...
Below find trial and error and semi official switch settings for
putting faster cpu's in the
MAGITRONIC 7500A (486 DX66)
MAGITRONIC 7600 (p1 75)
----------
FASTEST SETTINGS FOR THE 7600
on off on on on off on off checkits at 300 100611 dhry 40615.3
whet
fastest, but locks up the ram (bleh)
on off off on on off on off checkits same at 272 100611 dhry 39787
W
Second fastest, ram appears stable under checkit full test.
on on on on on off on off checkits at 272, 100611 dhry, 39787
Whet
Alternate second fastest setting, memory test stable as well.
Heres are my original settings:
Stock 75 MHZ Pentium
1 2 3 4 5 6 7 8
0 1 0 1 1 0 0 0
-------------------
TRIAL 1
Switches 1 2 and 3 assume 7 & 8 on, off for all
off on off = for 75 mhz
on off on = for 100 mhz gets checkit 300
on on on = whatever gets checkit 270
on off off = whatevr gets 270
off off off = whatever gets 170
off on on = whatevr 174
------------
TRIAL 2
Switches 7 & 8 seem to effect speed as well
Norton SI readings And checkit Readings (vary but cluster) at:
stock 0 0
127 Si
43124 Dry
16200.7 Whet
1 0
SI 150
49933 Dry
22364 Whet
0 1
SI 113.27
14522 DRY
7228.8 Whet
1 1
SI 170
16999 DRy NOTE poor checkit scores
8184.0 Whet despite high SI score
SWITCH 6 seems to effect the video, based on 7500A
switch setings and behaviour, I believe it toggles
the pc to a mono screen
Attempts to "overclock" my P75 to suggested P100 settings
causes the pc to lock, even when the slowest Sw 7 off/ Sw 8 on
is engaged. A p133 chip fixed that.
ADDED: A p133 dropped in
1=on
2=off
3=on
7=on 8=off
Si 256-270 (SI IS USELESS)
303mhz by dos checkit 10061dhry 40605 whet
(later found to lock high ram)
with 7 & 8 ON
300mhz
45178 dhry
18508.4 whet
My P75 came with a heat sink and fan, based on advice, I
will make sure it stays on the new cpu. I used 2 drops of epoxy and
thermal paste
Now its a p133 with a fan
I got some response from an email to the clevo support address
see below.
--------------- THE 486 7500A ----------------
clevo magitronic 7500A (486) c.a. 1990-1991
(long battery, Grey case, power up button above the F11 key)
Courtesy of a fax/jpg from Clevo TW.
(apparently their server went down and they lost a lot of stuff..)
Please note the 7600 serv manual on their ftp site is for a LATER,
More powerful version...
To determine rev version your 7500A 486.....
Look at your existing setup to figure out which rev you have
SW1 and SW 4 are UNDER the cpu. SW 3 is omitted on mine..
U is closest to the back on the switches
cut n paste into notepad so the sw setting line up
******************************
MB 71-75400-001
INTEL SW1 U U U U D D D D
SW4 D D D D D D D D
CYRIX SW1 D D D D U U U U
SW4 D D D D D D D D
AMD SW1 D D D D D D D D
SW4 D D D D U U U U
******* CLOCK SPEED *****
SW2 25MHZ 1 2 3 4 5
U D U D U
SW2 33MHZ 1 2 3 4 5
X2 U D U D D
SW2 40MHZ 1 2 3 4 5
U D U U U
SW2 50MHZ 1 2 3 4 5
U D U U D
***** LCD PANEL ******
SW2 MONO 6 7 8
U U U
DSTN D U U
TFT D D D
****CPU SX / DX *****
SW 3 SX 1 2 3 4 5 6 7 8
D D D D D U D D
SW 3 DX 1 2 3 4 5 6 7 8
D D D D U D U U
******** END *********
Now for the OTHER MB (this is the kind I have )
MB 71-75400-002
INTEL SW1 U U U U D D D D
SW4 D D D D D D D D
CYRIX SW1 D D D D U U U U
SW4 D D D D D D D D
AMD SW1 D D D D D D D D
SW4 D D D D U U U U
******* CLOCK SPEED *****
SW2 25MHZ 1 2 3 4 5
D D U D U
SW2 33MHZ 1 2 3 4 5 NOTE THAT ALL IS THE SAME
X2 D D U D D EXCEPT THE #1 sw setting
IS REVERSED ON SPEED SETTINGS
SW2 40MHZ 1 2 3 4 5
D D U U U
SW2 50MHZ 1 2 3 4 5
D D U U D
***** LCD PANEL ******
SW2 MONO 6 7 8
U U U
DSTN D U U
TFT D D D
****CPU SX / DX *****
SW 3 SX 1 2 3 4 AND THE SW3 IS SMALLER
D U D D (gets left off after a while)
SW 3 DX 1 2 3 4
U D U U
******** END *********
I replaced the intel dx266 with a cyrix dx4100
using the cyrix cpu switch settings and the speed setting at 40mhz
(it should be at 33mhz) System runs fast and stable.
The original passive heat sink was remounted onto the cxdx4100.
---------- orig CORRESPONDANCE w. Bill Higdon ---------------
>
>No problem on the question, I have a 90 mhz at home, I haven't pulled the
>CPU to check the settings yet,
>I have the following settings to upgrade the CPU to a 100 MHZ, the are as
>follows
>The switch settings I used for the 100 mhz Pentium were:
>SW 1 = 1 & 3 ON; 2 Off
>I have heard that these systems will take a WinChip2, although I haven't
>tried it yet.
>One question does your cpu have a fan on it? Sager didn't use a fan on some
>of theirs and they had a habit of dieing due to cpu melt down.
>
>Bill Higdon
>
------- thats it......
Now have both running as fast ast hey can..
The 7600 is stuck at 8M cause it uses a special, non standard ram
card.
Do a google search for MORON an DRUM and HAMMERHEAD
to find a neat DOS drum machine that runs on these and their built in
ESS930 near-useless sound card cicuitry...
thanks to all for the help on this... B/H.
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