GMX Micro-20 68020 User guide

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GMX !Ucro-20-
68020 S ingl.e-b::lard Computer
Hardware Setup ttanua1

GMX t!1cro-20-
68020 Singl.e-board Computer
COPYRIGHT -1986
GtIX Inc.
Hardware Setup Kanual.
1337 W. 37th PLace
Chicago. XL 60609
312-927-5510 * TWX 910-221-4055
All Rights Reserved
Reproduction of this aanual.. in whol.e or part. by any aeans.witbout
express written permission froa GMX Xnc. isstrictl.y prohibited.
G~ 1s a trademarks of GMX :mc. Chicago. XL 60609

GMX Micro-20- Hardware setup Manual
Revision History
Revision A
01/13/86 First general release
<§>1986 GMX INC
ii
Rev A

GMX Micro-20· Hardware setup Manua~
CONTENTS'
CHAPTER 1
HARDWARE SETUP
SECTION
PAGE
1: POijER SUPPLy ••••••••••••••••••••••••••••••• 1
2: -SERIAL. ADAPTER BOARD ••••••••••••••••••••••• 1
3: SYSTEM CONSOL.£ TERMINAL.
3-1: Conso~e Termina~ Requirements ••••••••• 1
3-2: Conso~e Termina~ Connections •••••••••• 1
3-3: Conso~e Baud Rate Se~ection ••••••••••• 2
3-4: Conso~e Termina~ Data Format •••••••••• 3
4: RESET and ABORT SWITCHES ••••••••••••••••••• 3
5: REMOTE: INDICATOR L.£Ds •••••••••••••••••••••• 3
6: DIP-SWITCH OPTIONS ••••••••••••••••••••••••• 3
7: JUMPER OPTIONS •••••••••••••••••••••.•••••••• 4
8: FLOPPY DISK DRIVES
8-1: F~oppy Disk Drive Requirements •••••••• 5
8-2: F~oppy Disk Drive Conriguration ••••••• 5
8-3: F~oppy Disk Ready Option •••••••••••••• 5
8-4: F~oppy Disk Drive Connections ••••••••• 6
9: SASI INTERFACE
9-1: SASI Contro~ler Requirements •••••••••• 6
·9-2: SASI Control~er Conriguration ••••••••• 7
9-3: SASI Contro~~er Connections ••••••••••• 7
10: PARALr.EL. INTERFACE
10-1: Para~le~ Interrace Requirements ••••••• 7
10-2: Para~~el Interrace Conriguration •••••• 8
10-3: Para~le1 Interrace Option Jumpers ••••• 8
(con't)
01986 GMX INC
iii
Rev A

SECTION
CHAPTER 2
SYSTEM CHECKOUT
11: Hardware Diagnostics
PAGE
11-1: Initial Power-up •••••••••••••••••••••• 9
11-2: Confidence tests •••••••••••••••••••••• 9
11-3: 020Bug Diagnostics ••••••••••••••••••• 10
11-4: Self test Loop Mode ••••••••••••••••••• 11
APENOICIES
Appendix A: DC Power Connector P8 ••••••••• 13
Appendix B: Switch and LED Connections •••• 14
Appendix C: Connector and Jumper Locations 15
_1986 GMX INC
iv Rev A

INTRODUCTION
This manua1 contains genera1information ori the initia1 setup and
and checkout of the GMX Micro-20 SingLe-board Computer when used with
the GMX Micro-20 Support ROM firmware and/or one of the optionaL disk
operating systems. It is intended to be used in conjunction with the
"GMX Micro-20 Hardware Reference ManuaL" (for connector pinouts, etc.)
and the appropriate software manua1s.
The manuaL is divided into ·two chapters. Chapter 1 dea1s with
basic hardware requirements and configuration. It is intended
primariLy for users who have purchased the GMX Micro-20 board for use
with their own power suppLy, disk drives, etc., a1though the
information on cons01e termina1 requirements appLys to a11 users.
Chapter 2 covers initia1 system checkout using the buiLt-in
diagnostic firmware. We recommend that 811 users become fami1iar with
the buiLt-in diagnostics, and that the diagnostics be used during
initia1 system setup to verify proper operation of the board.
If you have any questions or comments concerning the setup and
operation of the GMX Micro-20 or the information in this manuaL,
pLease contact us at the address or phone number 1isted on the cover
page.
mlq96 GMX INC v
Rev A

CHAPTER 1
HARDWARE SETUP
,
This chapter covers the basic hardw~re requirements for operating
the GMX Micro-20 with 020Bug and/or a disk operating system. Refer to
appendix C for the locations of connectors and jumper areas.
SECTION 1: POWER SUPPI..Y
The board requires a source of well filtered and regulated +5 and
+12 Volts D.C. Connect a suitable supply to D.C. power connector P8.
which uses the same mating connector and pinout as a standard 5 1/4"
disk drive. Appendix A shows the pinout of connector P8.
SECTION 2: SERIA[. ADAPTER BOARD
The serial adapter board provides line drivers and, if needed, the
appropriate additional supply voltages to convert the TTL level
signals on the GMX Micro-20 board to match an interface standard such
as RS-232. A 50-pin ribbon cable connects the adapter to the main
board at connector P2. Be sure to observe proper porarity (pin 1)
when connecting the s~rial adapter board.
CAUTION: In most
Micro-20 serial
terminals.Severe
signals (such as
cases. an adapter board MUST be used between the GMX
I/O connector (P2) and external devices such as
damage to the board will result if non-TTL level
RS-232) are connected directly to connector P2.
Refer to the "Hardware Reference Manual" and the serial adapter
board manual for more information.
SECTION 3: SYSTEM CONSOLE TERMINAI..
3-11 Console Terminal'Requirements
At least one standard ASCII serial terminal must be connected to
the board. Additional terminals may be connected; however, for
initial operation only the console terminal is required. The console
terminal must be configured for~_~51.tt"t:.J,8).c:\Clta bi~s, ~~c~,J2..~r:l,'ty (bit
8 always 0). and 9DJ~~B~,:t. The terminal baud rate must be set to
19, 200!,J 9._ 2Kl..",.~~d unless the default baud rate of the Support ROM
has been changed. "Refer to the section on console baud rate selection
for information on changing the default baud rate.
The
Micro-20.
3-2: Console Terminal Connections
console terminal connects to serial port #0 on the GMX
If the standard 25-pin RS-232 adapter board is used, port
~1986 GMX INC
-1-
Rev_ A

#0 is accessed at connector P1 on the adapter. P1 on the 25-pin
adapter is wired as DCE: and a "straight" 3 or 4 wire cabl.e can be Used
to connect the terminal.. If a different serial. adapter board is being
used, r~fer to the adapter board documentation for connector l.ocation
and pinout.
In many cases, onl.y transmit data, receive ~ata. and signal.
ground are required. However. handshaking wil.l ·be needed if the
terminal is not capabl.e of continuous data reception at the baud rate
being used. The CTS handshake input can be used to start and stop
output from the GMX Micro-20 to the terminal.. When CTS is asserted
(high), output is enabl.ed. when CTS is deasserted (l.ow), output is
disabled.
The software also supports XON/XOFF (OC1/OC3) handshake for both
input and output. If XON/XOFF 1s used, hardware handshake 1s not
required.
3-3: Console Baud Rate Selection
The default console baud rate is 19,200 (19.2K) baud. If the
console terminal is not capable of operation 19.2K baud, the Support
ROM must be altered to change the default baud rate. A one-byte value
in the ROM determines the default baud rate for the console terminal
used by the ROM firmware and optional. disk operating systems.
The baud rate byte is the fifth byte (address $0004) 1n PROM #4
of the PROM set. PROM #4 is located at U-13 on the GMX Micro-20 board
and contains the 8 high-order data bits, 024-031. The PROMs are
normal.ly shipped with byte 5 set to all ones ($FF). This 'is the
unprogrammed state. so any desired value can be programmed at this
location without reprogramming the entire device.
To change the default console baud rate, locate the desired rate
in the tabl.e (Figure 3-1) and reprogram the PROM with the value shown
in the table. If PROM programming facil.ities are unavailable. contact
the factory for information on obtaining custom PROM sets.
CONSOLE TERMINAL DEFAULT BAUD RATE BYTE
BAUD RATE BYTE BAUD RATE BYTE
75 $00 1800
$AA
110 $11
2000
$77
134.5 $22
2400
$88
150 $33
4800
$99
300
$44
-9600
$BB
600
$55
19,200 SCC
1200 $66
Flgure3'-1
<e1986 GMX INC
-2-

3-4:Conso1e Data Format
The cons01e POrt is configured, by default, to the fo110wing
transmission format:~_Q.C!1:a,pi1:~, sPC:l~ep?r~ty (bit 8 is a1ways zero),
and], ~t;9.P"p1t. All of the software uses this format for the cons01e
termina1. The transmission format for the cons01e port is fixed, and
can not be modified by the user. The other three ports also default
to this format, but can be changed if necessary.
SECTION 4: RESET and ABORT SWITCHES
The board has provisions for connecting remote1y mounted reset
and abort switches. The reset switch resets the processor, and any
other devices connected to the processor's reset line. The abort
switch generates a 1evel 7 autovector interrupt to the processor, and
is genera11y used during software debugging to interrupt a running
program. The abort switch also functions as a sing1e-step switch when
the hardware single-step mOde is enab1ed.
Appendix B shows the necessary connections for reset and abort
switches. See the "Hardware Reference Manual" and the software
documentation for more detai1ed information on switch functions.
SECTION 5: REMOTE INDICATOR LEOs
The board has provisions for remote mounting of a HALT LED , and
an LED for power-on indication. The remote HALT LED duplicates the
function of the on-board HALT LED (LED 1), while the power-on LED
provides an indication that +SVDC is app1ied to the board.
There are no provisions fora remote status LED (LED 2); however,
one can be provided by removing the on-board LED and wiring a remote
LED direct1y to the board.
Appendix B shows the necessary connections
Refer to the "Hardware Reference Manual"
information.
SECTION 6: DIP-SWITCH OPTIONS
for remote LEOs.
for more detailed
The first two sections of DIP-Switch S1 (51-1 and S1-2) select
the basic operating mode of the 020Bug Debugger/Diagnostic package.
Switch 51-1 enables or disab1es the interactive portion of
020Bug. If S1-1 is ON (c10sed), 020Bug enters the interactive mode on
power-up or reset. This is the normal mode for using 020BUg. If 51-1
is OFF (open), 020Bug is disabled. and the system will switch to the
disk operating system firmware (if present) on power-up or reset.
Switch S1-2 enables the auto-self test mode used at the factory
f!),q~h GMX iNC
-3-
. Rev. A