Path: utzoo!mnetor!uunet!husc6!hao!ames!pasteur!ucbvax!RADC-LONEX.ARPA!koziarzw
From: koziarzw@RADC-LONEX.ARPA
Newsgroups: comp.sys.zenith.z100
Subject: (none)
Message-ID: <8803220037.AA16528@radc-lonex.arpa>
Date: 22 Mar 88 00:37:11 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 50

Mail to:	info-hz100@radc-tops20.arpa	Date: Mon Mar 21 19:35:32 1988
From: koziarzw@radc-lonex.arpa
Sender: koziarzw@radc-lonex.arpa
Subject:	Z-205 Switches and Jumpers
cc:		none
Message:

As mentioned by Gern, there are several switches that must be set on the
Z-205 256K RAM Board to use that board in a 768K Z-100.  The following are
a properly working set of switch settings for this board in a 768K, 8MHz
Z-100.  Note that a '1' indicates that a switch is OFF, and that a Jumper
is INSTALLED!!!!

Switch SW1 --

position --  7 6 5 4 3 2 1 0
----------------------------
setting  --  1 0 0 1 1 0 1 0

   This sets I/O port address 09A Hex for the parity check


Switch SW2 --

position -- 7 6 5 4 3 2 1 0
---------------------------
setting  -- 0 0 0 0 1 1 0 0

   This sets board address at 0C0000 - 0FFFFF for a board populated with
   a total of 256K (normal situation)


Jumpers J1, J2 -- 0; Indicates 256K installed on board

Jumper J3 -- 1; Inserts 3 wait states -- needed for 8MHz operation

Jumpers J4, J5, J6 -- 0; Other wait state selections
          Only ONE of J3-J6 may be selected or DAMAGE to board may result

Jumper J7 -- Place jumpers on sections 2-3 and 4-5; ?unknown function?

These switch and jumper settings will allow use of this board in a 768K Z-100,
except those that are in the hands of I(nferior) B(ut) M(arketable) PC
worshippers.  If there is a Z-205 owner out there with a Z-100 whose MS-DOS
only allows access to 640K, I will gladly accept his excess Z-205 Board!!!!


Cheers,

Walt K.