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STD RC2014-MSK-Z84C10-DMA
RC2014-MSK-Z84C10-DMA
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Update time：
2018-12-16 21:35:52
Creation time：
2018-09-25 09:07:31
Description
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
Design Drawing
Design Drawing
schematic diagram
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PCB
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RC2014-Z84C10-DIP
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RC2014-Z84C10-DIP-V2
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| 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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