Table of Contents
Related Manuals for Glitch Works GW-OSI-RAM1
Summary of Contents for Glitch Works GW-OSI-RAM1
- Page 1 Glitch Works GW-OSI-RAM1 User’s Manual and Assembly Guide Revision 1, 2017-09-04 c 2017 The Glitch Works http://www.glitchwrks.com/ This manual is licensed under a Creative Commons “Attribution-NonCommercial-ShareAlike 4.0” license.
-
Page 2: Table Of Contents
3 Assembly 3.1 Assembling the GW-OSI-RAM1 ......3.2 0-64K Memory, no Memory Management or ROM Overlay .... -
Page 3: Introduction
Header for lamp register General purpose prototype area The GW-OSI-RAM1 uses JEDEC pinout 32K x 8 memory devices, such as the 62256 SRAM, 27256 EPROM, or 28256 EEPROM. Memory can be enabled in 4K segments to map around existing RAM, ROM, and I/O. -
Page 4: Configuring I/O
I/O device is write-only (for example, a GW-OSI-HLR1 Hex Lamp Register), it can be addressed over existing RAM on the GW-OSI-RAM1 but not on another RAM board. If the I/O device is read- only or read/write, it must not overlap RAM. The GW-OSI-RAM1 provides memory management inputs in the memory address decoding sections to allow a read-only or read-write I/O device to be inserted into RAM on the GW-OSI-RAM1. -
Page 5: Prototyping Area
Consult the schematics for J3 pinout and signal functions. 12-Bit Operation The GW-OSI-RAM1 was designed with 12-bit operation in mind, for use on the SYS bus of the OSI 560Z Processor Lab. Addressing and configuration is the same as 8-bit mode, but the data buffer at U24 must be installed, and RAM or ROM must be installed in U14 - U17 to provide the additional upper 4 data bits. -
Page 6: Assembly
Assembly The GW-OSI-RAM1 is designed to be easy to assemble for anyone with moderate soldering ability. The following tools will be required: Soldering iron, 20-40 W recommended, grounded tip Solder, 63/37 leaded solder recommended, Kester “44 Core” or similar Diagonal cutters or flush cutters... -
Page 7: 0-64K Memory, No Memory Management Or Rom Overlay
0-64K Memory, no Memory Management or ROM Overlay The following components should be installed for a 0-64K system without memory management or ROM overlay: Install 74LS138 decoders at U1, U4 Install 74LS30 ICs at U2, U5 Install DIP switches at SW1, SW2 Install resistor packs at RN1, RN2 Bend two 10K resistors –... -
Page 8: I/O Support
I/O Support To enable support for an I/O mezzanine module or for use with the prototype area, complete the following steps. Note that I/O can be disabled by jumper shunt if this section is populated: Install 74LS688 comparators at U12, U13 Bend one 10K resistor –... -
Page 9: Initial Checkout And Testing
Troubleshooting If your system fails to come up with the GW-OSI-RAM1 installed, start by disabling all memory segments – set SW1 - SW3 and SW6 to all off. Remove the jumper shunt on J2, if installed. If this allows the system to come up, start enabling RAM segments one at a time, to determine where a conflict may exist. -
Page 10: Parts List
7404, 74S04, 74F04, 74LS04, 74ALS04, or 74HCT04) All resistors and resistor packs on the GW-OSI-RAM1 are pull-up or pull-down resistors, and may be any value from 4.7K to 47K, even though they are indicated as 10K on the assembly drawing Resistors may be of varying precision and body type –...
Need help?
Do you have a question about the GW-OSI-RAM1 and is the answer not in the manual?
Questions and answers