
PA-RISC SCSI SCSI chipsets
Attaches to host bus interface, can either be Motorola 68030 (bus up to 25MHz async) or 68040
(bus up to 33MHz sync) compatible
Sustained host bus bandwidth of up to 42.66MB/s
53C720
Used in
735, 755 (ASP2)
B132L, B160L
C100, C110, C132L, C160L, C160, C180
D-Class
J200, J210, J210XC, J280, J282
K-Class
R380, R390
The NCR 53C720 was the secondary SCSI controller used in the early HP 9000s for the attachment
of an Fast-Wide (16-bit) SCSI-2 bus, utilizing HVD signalling. It was either controlled by the ASP2
chipset or interfaced to the GSC bus through a chip named Zalon.
Features
One Fast-Wide SCSI channel
Chip support for SE and HVD transfer modes (in the HP 9000s only HVD logic is used)
Synchronous SCSI transfer rate of 20MB/s
Asynchronous SCSI transfer rate of 10MB/s
64-Byte DMA FIFO
16- or 32-bit bus master DMA device
Attaches to host bus interface, can either be Motorola 68030 (bus up to 25MHz async) or 68040
(bus up to 33MHz sync) or Intel 80386SX or 80386DX compatible
Support both big or little endian
Sustained host bus bandwitdh of more than 100MB/s
208-pin QFP package
53C875
Used in
A400 (rp2400, rp2430), A500 (rp2450, rp2470)
B132L+, B180L+
C200, C240, C360
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