H89 CPU parts list ICs ___________________________________________________________________________ U Number Heath Number Generic Number Special function --------------------------------------------------------------------------- U501 443-18 7404 U502 443-34 7492 U503 443-760 CD4040 U504 443-881 Z80 *4 U506 443-730 74LS74 U507 443-727 96L02 *3 U508 443-824 74LS241 U509 443-824 74LS241 *2 U510 443-837 74LS373 U511 443-837 74LS373 U512 443-730 74LS74 U513 443-824 74LS241 U514 443-824 74LS241 U515 443-779 74LS02 U516 PROM 444-41 74S188 Memory map 444-9001 U517 PROM 444-42 0 ORG. 444-66 SN74S470 Memory map U518 PROM 444-40 NEWEST 444-62 ! TMS 2716 Boot system U519 Not used U520 PROM 444-19 2716 Floppy controller *2 U521 443-754 74LS240 U522 Not used *2 U523 443-764 2114 RAM (floppy) U524 Not used U525 443-764 2114 RAM (floppy) *36 U526-U549 +U1-U9 16K EXP 443-904 4116 RAM (main memory) U550 PROM 444-43 NEWEST 444-61 ! SN74S470 I/O Map U551 443-791 74LS244 U552 443-805 74LS273 U553 443-875 74LS32 U554 443-732 74LS30 U555 443-730 74LS74 U556 443-730 74LS74 U557 443-912 74LS148 U558 443-754 74LS240 U559 443-794 1488 U560 443-795 1489 U561 443-874 8250 UART U562 443-901 74S132 U565 442-664 79M12KC or 7912 Regulator *3 U566 442-665 7905 Regulator *2 U567 442-663 78M12 or 7812 Regulator U568 442-663 78M12 OR 7812 Regulator U569 442-665 7905 Regulator U11 442-665 7905 Regulator 16K board * = First time number is listed shows total of that number used in CPU. ! = Newest PROM set must be used together, for correct I/O control.