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Z80 RC2014 DMA
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RC2014-MSK-Z84C10-DMA

1 year ago 332
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Description

This is a DMA module for the Z80 CPU used in the RC2014.

V2.0 -

This version has still a bug. One must connect the +5V signal (available at a pin on the PCB) to the RDY single pin. I tried only memor transfers at 7.8 MHz and they seem to work without problems. So the RDY-signal was floating and this means, that the DMA did NOT release the bus again (the test program was using the continous transfer mode) and the whole computer was not working (no M1 signal was found). After a RESET the DMA requested the bus at once.

The debug signal PIN_READY ist not connected

Documents

Sheet_1

RC2014-Z84C10-DIP

RC2014-Z84C10-DIP-V2

RC2014-Z84C10-DIP-V3

BOM

ID Name Designator Footprint Quantity Mounted
1 Z84C10-Z80DMA-DIP Z84C10-DEV-A DIP40 1 Yes undefined
2 Bus RC2014/80 U3 HDR-2.54-19-2X40P 1 Yes undefined
3 Header-Male-2.54_2x2 P3-BAO,P2-BAI,P-USR-IEI/O HDR-2X2/2.54 3 Yes C66690
4 Header-Male-2.54_1x5 H1-DBG DIP-1X5P-2.54MM-M 1 Yes C124379
5 4k7 R2-CLK,R3-INT AXIAL-0.3 2 Yes
6 2k R1-BUSREQ AXIAL-0.3 1 Yes
7 74LS157 U2-157 DIP16 1 Yes
8 100nF C1-157,C2-DMA,C3-688-100NF RAD-0.1 3 Yes
9 Header-Male-2.54_1x2 P-EXT-IEI/O HDR-2X1/2.54 1 Yes C86471
10 74HCT688 U-HCT688 PDIP-20 1 Yes 595-CD74HCT688E
11 8x10k RP1-10K SIL-9 1 Yes
12 Header-Male-2.54_2x6 P4-PORTADDRESS HDR-6X2/2.54 1 Yes C124388
13 Header-Male-2.54_1x1 P1-RDY HDR-1X1/2.54 1 Yes C81276

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