jeffm@mmintl.UUCP (Jeffrey Miller) (02/17/86)
* On the subject of adding memory to the 6300: If 2 rows of memory (bank 0) are soldered and 2 are socketed, adding 256k chips in the 2 socketed rows (bank 1) to the 2 rows of soldered 64k chips will give you 640k on the motherboard. This is the optimum config. DIP switch 0 (farthest from the edge of the board controls system memory. 1 = on 0 = off x = don't care system memory sw1 sw2 sw3 sw4 sw5 sw6 sw7 sw8 ------------- ------------------------------- 128kb 0 1 1 1 x x x x 128kb-motherboard 256kb 1 0 1 1 x x x x 256kb-motherboard 384kb 0 0 1 1 x x x x 256kb-motherboard & 128kb-expansion board 512kb 1 1 0 1 x x x x 256kb-motherboard & 256kb-expansion board 640kb 0 1 0 1 x x x x 256kb-motherboard & 384kb-expansion board 512kb 1 1 1 0 x x x x 512kb-motherboard (bank 0) 640kb 0 1 1 0 x x x x 512kb-motherboard (bank 0) 128kb-motherboard (bank 1) *640kb* 0 1 0 0 x x x x 128kb-motherboard (bank 0) 512kb-motherboard (bank 1) Position Function -------- -------- 1-3 system memory configuration 4 64kx1 or 256kx1 DRAMs on the motherboard My question is, if you replace the soldered 64k chips with 256k chips, can you access the memory above the 640k? On the subject of add-on drives for the 6300+: In November I saw an early version of it *at AT&T* in New York at a repair class. It had a WD short board controller with a Seagate ST225 20 meg hard disk. Need I say more? On the subject of interleave factor: I recently set up a 6300 with a WD short board (WD1002S-WX2 and the 'S' stands for short) and a NEC 5126 (I think the # is correct?) 20 meg drive. I used the firmware hard format at 0C800:5 with debug and the default interleave of 3. I ran Norton's disk test (DT /D) and it took 14:06 minutes. I reformatted the drive with an interleave factor of 6 and the same Norton test took 5:43 minutes! I'm not sure what will happen when I get to writing stuff on the inner cylinders of the disk but that difference sure is impressive, and noticeable in applications. ... Jeff ************************************************* * Jeff Miller * * Multimate International Corp. * * 52 Oakland Avenue * * East Hartford, CT 06108-9911 * * (203) 522-2116 x257 * * UUCP: * * ...!seismo!utah-cs!utah-gr!pwa-b!mmintl!jeffm * ************************************************* *