| ??? 06/14/07 20:56 Read: times |
#140800 - What was I thinking...! Responding to: ???'s previous message |
Thank you, Jan & Erik, for the eye opening insight. I'm not sure where I ever got the idea that I could just throw a 64k Eprom into the mix and expect to use the entire space as data (lookup storage). Rather than carve up my pretty little SBC I think I'm going to try scaling back the number of fonts to fit in the back of the ram chip. I had thought about using I2C EEproms but I have the nasty suspicion that they may be a tad slow, especially since none of the accesses will be sequential.
In light of Erik's suggestion what I also may wind up doing is installing a Dallas 87C520, which has 64K of flash, execute from MCU and map the majority of code memory for the font tables. Also, the boost in speed can't hurt, either. Hal |
| 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 |