2. Getting Started
12
Frontplane Connector Assignments
Connector
Function
J1
J1 provides Direct Memory Access (DMA) support for external
peripherals via channel 0 or 3 on the local 8237A DMA controller. The
floppy disk controller can use this connector to request service from the
DMA controller on the ZT 8954. This connector is not normally loaded
on the ZT 8954, as it resides under the integrated floppy drive.
J2, J3
J2 and J3 accommodate 0.1" 34-pin floppy interface drives. J3 is a
reverse image of J2 to allow interfacing to drives with minimal cable
twisting.
J4, J6
J4 and J6 are 1 mm FPC cable connectors for newer slimline floppy disk
drives. J4 is not loaded by default as it is underneath the integrated
floppy drive.
J5
J5 is for a power cable connection location for remote floppy disk drives.
STD 32 COMPLIANCE
STD 32 peripherals are required to meet certain compliance standards. This allows the
system integrator to match capabilities among different manufacturers' boards.
STD 32 peripherals are available from a variety of manufacturers.
The ZT 8954 has the following STD 32 compliance:
I/O Slave:
SA8 - I, IXP, IXL, SDMA8, SDMABP, EDMAA, EDMAB
Definitions
SA8
Standard Architecture 8-bit transfers
I
Can drive INTRQ*, INTRQ1*, INTRQ2*, and/or INTRQ3*
IXP
Can drive IRQx with a positive active edge
IXL
Can drive IRQx with an active low request
SDMA8
Supports frontplane 8-bit DMA transfers
SDMABP
Supports Standard Architecture backplane DMA by BUSRQ*/BUSAK*
EDMAA
Extended Architecture type A DMA transfers supported
EDMAB
Extended Architecture type B DMA transfers supported
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