Macintosh Quadra 605: Difference between revisions
Rewrite on the Service Source and LC 475/Quadra 605 Developer Note: Gestalt ID is 94 (89 is the LC 475); slot is accessible via a rear knock-out, not a PDS, 4 W budget; Processor Upgrade is Apple's; ROM and HD discrepancies stated; VRAM table from dev note; remove duplicate spec tables and uncited claims; Quadra 605 photo replaces LC 475 photo |
Add J18 jumper on the shared LC 475/Quadra 605 service board (Service Source Logic Board pp. 23-24) |
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The machine has two internal buses. The system bus runs at the processor clock; the I/O bus runs at 16 MHz and is buffered by Apple's PrimeTime IC, which gives 68030-style byte steering and dynamic bus sizing for older I/O software. The five custom ICs are MEMCjr (memory controller and frame buffer), PrimeTime (I/O buffer, SWIM II floppy controller, both VIAs), DFAC II (sound input), Cuda (ADB and power control) and Antelope (video CLUT and DAC). The SCSI controller is a 53C96.<ref name="dn" /> | The machine has two internal buses. The system bus runs at the processor clock; the I/O bus runs at 16 MHz and is buffered by Apple's PrimeTime IC, which gives 68030-style byte steering and dynamic bus sizing for older I/O software. The five custom ICs are MEMCjr (memory controller and frame buffer), PrimeTime (I/O buffer, SWIM II floppy controller, both VIAs), DFAC II (sound input), Cuda (ADB and power control) and Antelope (video CLUT and DAC). The SCSI controller is a 53C96.<ref name="dn" /> | ||
Apple's service replacement logic board is the same part for the LC 475 and the Quadra 605; a Quadra 605 board has a jumper fitted on pins J18, which Apple's technician moves from the old board to the new one.<ref name="ss" /> | |||
There is no programmer's switch. The NMI is Command-Power On and a reset is Control-Command-Power On, each held for at least one second.<ref name="dn" /> | There is no programmer's switch. The NMI is Command-Power On and a reset is Control-Command-Power On, each held for at least one second.<ref name="dn" /> | ||
== Memory == | == Memory == | ||
The logic board has 4 MB of RAM and one 72-pin SIMM socket. Apple's configurations run from 4 MB to 36 MB using 1, 2, 4, 8, 16 or 32 MB SIMMs; access time must be 80 ns or less, and the SIMM contacts must be tin.<ref name="dn" /> Apple's service manual lists 4 MB or 8 MB as shipped.<ref name="ss">Apple Computer, ''Macintosh LC Series/ Quadra 605 Service Source'', hosted as [[:File:Quadra_605.lc_series.pdf]] (see [[Macintosh LC Series/ Quadra 605 Service Source]]). Specifications pp. 3-13; Additional Procedures, Battery Verification pp. 1-2; Exploded View.</ref> EveryMac reports that third parties have run the machine with a 128 MB SIMM, for 132 MB.<ref name="em" /> | The logic board has 4 MB of RAM and one 72-pin SIMM socket. Apple's configurations run from 4 MB to 36 MB using 1, 2, 4, 8, 16 or 32 MB SIMMs; access time must be 80 ns or less, and the SIMM contacts must be tin.<ref name="dn" /> Apple's service manual lists 4 MB or 8 MB as shipped.<ref name="ss">Apple Computer, ''Macintosh LC Series/ Quadra 605 Service Source'', hosted as [[:File:Quadra_605.lc_series.pdf]] (see [[Macintosh LC Series/ Quadra 605 Service Source]]). Specifications pp. 3-13; Take Apart, Logic Board pp. 23-24 (J18 jumper); Additional Procedures, Battery Verification pp. 1-2; Exploded View.</ref> EveryMac reports that third parties have run the machine with a 128 MB SIMM, for 132 MB.<ref name="em" /> | ||
Apple's developer note gives 1 MB of ROM soldered to the logic board; the Service Source's memory page says "512K expandable to 1 MB" for the LC III, LC 475 and Quadra 605.<ref name="dn" /><ref name="ss" /> | Apple's developer note gives 1 MB of ROM soldered to the logic board; the Service Source's memory page says "512K expandable to 1 MB" for the LC III, LC 475 and Quadra 605.<ref name="dn" /><ref name="ss" /> | ||