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Z80 RC2014 DMA
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RC2014-MSK-Z84C10-DMA

3 years ago 1040
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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 39c7aadb2afe48eba0638ccae36d2736 Z84C10-DEV-A DIP40 1 Yes undefined
2 bf7e5ab408ea435a92399190e4e058cb U3 HDR-2.54-19-2X40P 1 Yes undefined
3 7c4042779cea4abdf4b201e0d3ecfdb3 P3-BAO,P2-BAI,P-USR-IEI/O HDR-2X2/2.54 3 Yes C66690
4 355f04a15ac74ae6b97cef5b0c71f6b7 H1-DBG DIP-1X5P-2.54MM-M 1 Yes C124379
5 5ba509f895244278a1309c0031b47188 R2-CLK,R3-INT AXIAL-0.3 2 Yes
6 5ba509f895244278a1309c0031b47188 R1-BUSREQ AXIAL-0.3 1 Yes
7 e59435d0810848deb626ebad7bc8aa3d U2-157 DIP16 1 Yes
8 994f4acf33ff4e66aaa5dbbeb5e3fa4f C1-157,C2-DMA,C3-688-100NF RAD-0.1 3 Yes
9 c996990367134df4854174670f257897 P-EXT-IEI/O HDR-2X1/2.54 1 Yes C86471
10 543d0559cc3c45de8049de775cd4bb0c U-HCT688 PDIP-20 1 Yes 595-CD74HCT688E
11 45c574eccea54a669321212b252d4dcc RP1-10K SIL-9 1 Yes
12 c051f8c95abc83884b2e58d9d090651d P4-PORTADDRESS HDR-6X2/2.54 1 Yes C124388
13 050210eb44fb24b0f1f7d73e6372031b P1-RDY HDR-1X1/2.54 1 Yes C81276

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