| ??? 01/16/07 08:34 Read: times |
#130860 - Socket Responding to: ???'s previous message |
Is it an IC Socket, how many pins. Yes, it is in a socket. The socket is square and has 11 pins on each side. If you look at this file http://www.atmel.com/dyn/resou...oc1921.pdf I believe it to be the item shown in 2.2. That and the one in 2.1 appear the same shape, but looking at the drawing, I have Vcc on pin 44 and Gnd on pin 22. The common IC would be a "MAX232". I will look at the MAX232 part. The internal UART uses SBUF if the code is commented out so is the function. Yes, I will need to write new code for the SBUF. I think I have the timer worked out for the baud rate, although with a 20MHz crystal, the best I can get is ~9600 with a 1.36% error. It would appear most sites claim that an error of less then 3% is acceptable. Only time will tell. PL/M? How old is the code (or programmer)? PL/M is obsolete. I do not think Intel supports it anymore. As far as I can see, the first version of this particular product was released in about 2000, but the code base predates this. You are correct that PL/M is dead and for the most, buried. The compiler I have is an Intel DOS product of 1988 vintage. The rest of the kit is held together with string and duct tape. |
| Topic | Author | Date |
| AT89C55WD UART voltages. | 01/01/70 00:00 | |
| Level translation | 01/01/70 00:00 | |
| Thanks for that. | 01/01/70 00:00 | |
| Real? | 01/01/70 00:00 | |
| Real | 01/01/70 00:00 | |
| Reak! | 01/01/70 00:00 | |
| Voltage. | 01/01/70 00:00 | |
| Pins | 01/01/70 00:00 | |
| Pins | 01/01/70 00:00 | |
| the peculiar port structure of '51 | 01/01/70 00:00 | |
| The Socket | 01/01/70 00:00 | |
| Socket | 01/01/70 00:00 | |
| HW issues | 01/01/70 00:00 | |
| I am on the road, but someone can verify | 01/01/70 00:00 | |
| SN74LVC4245A | 01/01/70 00:00 | |
| 5V->3V conversion and vice versa | 01/01/70 00:00 | |
| If this is CMOS | 01/01/70 00:00 | |
| No insistance. | 01/01/70 00:00 | |
a link would be nice | 01/01/70 00:00 | |
| PLCC44 | 01/01/70 00:00 | |
| why AT89C55WD? | 01/01/70 00:00 | |
| Read the thread! | 01/01/70 00:00 | |
| AT89LV55? | 01/01/70 00:00 | |
| What is the blue tooth module? | 01/01/70 00:00 | |
| Module | 01/01/70 00:00 | |
| modules | 01/01/70 00:00 | |
| Modules | 01/01/70 00:00 |