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U1: ATMEL 89C52 running at 11.0592 MHz (for standard baud rate generation) Port 0 is the multiplexed address / data bus. Because this port uses open drain logic, all lines must be pulled high. Port 1 is not used in this example, can be used for any TTL logic. Port 2 is used for the upper 8 bits of the address bus. Port 3 is used for control signals, more specifically the RS232 port and RD# / WR# signals used for external memory reads / writes. U2: 74HC138 3-to-8 multiplexer This multiplexer is used to divide the 64 kB RAM address space in 8 x 8kB segments using the upper 3 bits of the address bus. The mutiplexer is only active when WR# or RD# is active, i.e. a write to or read from RAM is active. U3: 74HC08 AND gate This AND gate is used to enabled the multiplexer whenever WR# or RD# is active. The WR# and RD# signals uses negative logic (active when at ground) and are multual exclusive (only one can be active at any given time). Note that a positive logic AND gate can be used for

For WinCVS to work, you need a CVS-enabled folder before you can add to the repository. When you do a normal checkout it will create a CVS-enabled folder and you can continue as normal. But what must you do when you have an empty repository? You first need to check out the base directory, i.e. specify "." as module name. This will make the root of your working directory a CVS-enabled folder, and add a"CVSROOT" folder. Don't worry about this CVSROOT folder, this is a copy of the internal CVS data. After this you can add new folders and files to the repository. When you want to get rid of the CVSROOT folder, wipe everything from your working folder and do a fresh checkout of the new folder you've created.

I've reverted back to CVSNT v2.0.51d because CVSNT v2.5.04 places the following message on all commits, reason enough to get rid of it: Committed on the Free edition of March Hare Software CVSNT Server. Upgrade to CVS Suite for more features and support: http://march-hare.com/cvsnt/ I had some trouble to get the user working. Change step (4) in the previous post to: cvs -d :local:c:\Repository passwd -r cvs -D DOMAIN -a cvs where DOMAIN must be replaced with your local machine name. Also make sure the "use local users" tickbox is not checked in the CVSNT control panel box.

Setup of CVSNT  on Windows Vista I've installed CVSNT v2.5.04, but the process should be more or less the same for other versions. 1) You MUST create a cvs user. Go to Control Panel - User Accounts - Manage user accounts. On the advanced tab, click on the Advanced button, and add a new cvs user to the system. For this example I'm going to assume the username is "cvs". 2) Add a repository. Go to Control Panel - CVSNT Server. Under the repository configuration tab, add a new repository, e.g. Name c:/Repository Root /Repository. This should create & initialize the folder. 3) Under the Server Settings tab, choose user cvs from the "Run as user" listbox. Also change the temp directory. Windows doesn't allow read & write access for our cvs user in certain folders, including c:\Program Files. I've used c:\Repository\Temp. 4) Add a repository user. We can't add users the the repository using normal access, because we can't get in without a va

My HP 510 laptop's battery is supposed to keep the laptop running for 2 hours. However it lasted only 1 hour (I bought it new), and 1.5 years later I got about 15 minutes. The laptop runs WinXP Home. Reading some pages on the HP battery check utility, I've decided to reclaibrate my battery. This means charging the battery to 100%, set the power saving setting to "Always on", and keep the laptop running until it eventually dies.  For the first 15 minutes, the power level dropped at a constant rate, until it hit about 5%. Then it stayed for almost 30 minutes at 5%, and then died quickly. Running the laptop on AC power, I saw that the HP battery check utility reported a different battery level as Windows. After a restart both reported the same level. This means Windows does not always report the right battery level, and this is why you need to calibrate your laptop's battery every couple of months.