zTidbitz are a collection of condensed or summary information on a wide range of z/OS and System z hardware topics. You can think of them as "cheat sheets" or reference sheets in that they greatly condense considerably more product documentation. So they leave out a lot of detail and subtleties, but nevertheless, they can be very useful if you need a reminder or quick review of a topic area you are somewhat familiar with. Enjoy!   

Basic z/OS features

Batchpipes for z/OS
Capacity Provisioning      
CLIST_Gregorian to Julian
Cross Memory Services          
Decimal Floating Point
Extended Addressability    
Hour Glass              
Installation- Post Installation Fixes
Language Environment
Logs and the Logger       
Processes Enclaves & Threads
Resource Serialization
Resource Recovery Services 
Started Task Control   
Subspace
Virtual Storage Access Method 
V=R Terminology
z/OS System Overview
z/OS 1.11
z/OS 1.11 Upgrade and Migration
Extended System Queue Area in z/OS 1.11
z/OS Management Facility    
z/OS XML Services
z/Architecture Storage

Input/Output (I/O)

An I/O White Paper for System z
Channel Subsystem
Fiber Channel Multiplex-Demultiplex
Life of an I/O Operation
Multiple Logical Channel Subsystem
PAV_Illustrations
Parallel Access Volumes (PAV)

Java

Java Batch
Java Virtual Machine
J9 JVM

Operator Commands

MVS Console Commands

Parallel Sysplex

CFCC_Levels
DB2 on z Parallel Sysplex Clarification
SYSPLEX & Parallel Sysplex
Sysplex Distributor
Sysplex Failure Manager

Performance Monitoring

Capture Fault Events
RMF_Coupling Facility(CF)_Reports

Storage Management

BDAM vs VSAM
Pinning Data in Storage_VLF
VSAM_Extended Format_Extended Addressability

System Availability

Disaster Recovery (GDPS)
SMART Failure Analysis
zOS_Automatic Restart Manager

Server Hardware

Controlling Execution of zIIPs and zAAPs
Cryptographic Hardware 
Hiper Dispatch
History of the Mainframe
How different are OS/390 and z/OS
HMC and IOCP
IPSec and IIPs for z/OS
Logical Partitioning Processors and Weights
Micro Code Concepts
Processor Storage Subsystem
PR/SM CPU Dispatching
Reliability_Availability_Serviceability
System Assist Processor(SAP) - the free CPU on z
 

•  zEnterprise (z196)

   zEnterprise (z196) Overview
   Unified Resource Manager

•  z9 Features

   Logical System Structure

•  z10 Features

   z10 Enterprise Class
   Hiper Dispatch
   EAV_HyperPAV
   10 minutes of z10 ElevatorPitch
   z10 Large Page Support
   z10_SC_engines      

Transaction and Database Processing

IMS_CONNECT_Brief
IMS_Then and Today   
zIIP's DRDA

Total Cost of Ownership

CSC Data Center Consolidation

Unix

Find z/OS UNIX         
Hierarchical File Systems
Shared File Systems
Unix System Services Messages and Codes
zOS Unix
zFS file systems in sysplex sharing

Workload Management

Blocked Workloads               
Dispatchable Unit of Work (UOW)
Enclaves & Specialty Processors
The Job Entry Subsystem (JES)
Workload Management (WLM) 101
Websphere Application Server (WAS)' WLM 101
Websphere Application Server(WAS) & Resource Group (RG) Protecting Work
WLM Resource Groups