| ??? 06/14/07 18:46 Read: times |
#140793 - hummm.... Responding to: ???'s previous message |
Indeed. Also the output of address decoder (138 -> 08) connected to chipselect indicates, that it is mapped only to the bottommost 16k of address space...
It seems that it could be easier to try to adopt the RAM socket - or, use a RAM or a '256 FLASH/parallelEEPROM (if you can get hands on some - they are not manufactured anymore). JW PS. Couldn't you store the fonts in internal memory of a 64k chip such as the 'RD2s? Or a bigger serial EEPROM? |
| Topic | Author | Date |
| 8052.com SBC Eprom problem | 01/01/70 00:00 | |
| hummm.... | 01/01/70 00:00 | |
| staring at the papers and the board... | 01/01/70 00:00 | |
| without any knowledge of the specific | 01/01/70 00:00 | |
| What was I thinking...! | 01/01/70 00:00 | |
| the good, the bad and the ugly | 01/01/70 00:00 | |
| Semi-cute? | 01/01/70 00:00 | |
| flash? | 01/01/70 00:00 | |
| You are right, I Meant DS89C450 | 01/01/70 00:00 | |
That's why you should review the schematic | 01/01/70 00:00 |