William Levak wrote: > > On Fri, 7 Jul 2000, Bo Zimmerman wrote: > > > I recently received an SFD-1001 with drive select switches. I went poking > > around inside the drive and found some things I don't quite understand. I > > noticed that the SFD-1001 has no less than TWO 6502 processors. One on the > > main board, and another on a small daughterboard above the main board. In > > addition, the main board has two 6532s (for the iEEE-488 bus, I expect), but > > the daughterboard also has a 6522 near the 6502, and two other chips > > besides, marked 251257-02a, and 901885-04. One is a 24pin 2k eeprom. > > > > I'm curious about a couple of things: whats the 6522 for? Why does a > > single drive need two 6502s, and why the daughterboard? > > Those chip positions do not seem right. See my parts list on funet for > the correct chip placement. > > Basically, the SFD-1001 is a 8250LP with one of the drives missing. The > IEEE488 drives all have two processors, except the 2031 lp, which has a single 6502A (not MOS... "S"... synertek? strange...) and two 6522s no 6532s... if into hardware: PCB NO 1540038 REV A W-1894HB (C) 1981 made in japan -- 01000011 01001111 01001101 01001101 01001111 01000100 01001111 01010010 01000101 Larry Anderson - Sysop of Silicon Realms BBS (209) 754-1363 300-14.4k bps Classic Commodore pages at: http://www.jps.net/foxnhare/commodore.html 01000011 01001111 01001101 01010000 01010101 01010100 01000101 01010010 01010011 - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
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