JM005B IDE DOM and Floppy Mezzanine Board [v1.0] for SC126 V1.0

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Create a stackable disk io daughterboard for SC126 - Mechanically Compatible with JM002 stacked on the SC126 v1.0 Brings out the IDE-44 pin connector. Also provides an additional RC80 bus header connector and Floppy connector. Most IDE Drives will NOT work with the IDE-44 pin connector on this card due to mirroring of pins on DOM. It is a mechanical issue that drives the orientation of teh connectors. A cable usually resolves come pinout issues. But DOM IDE connectors are mirrored. See below.


Development Status Tracker

  • 09/13/2020 UNDER DEVELOPMENT
  • 09/13/2020 ROUTING COMPLETE
  • 09/13/2020 NETS CHECKED
  • 09/13/2020 SILK LAYERS CHECKED
  • 09/27/2020 COMPLETED ASSEMBLY, TESTED ALL OK with DOM IDE SSD and VT132 Card in Expansion SLOT
  • 09/27/2020 READY FOR USE

NOTE: Some DOMs have the IDE connector on one side or the other (not only on one end) and this determines the mechanical limitations for installation.

COMMENTS: This board (for many DOMs) may require the DOM to be at the end of a cable to lay flat. Many DOMs have incorrectly marked the pins or no markings are found at all. This is frustrating as the real orientation may not be known until the DOM is purchased and physically tested against a known pinout.

See also the alternate IDE 44 connector orientation: "JM005 IDE DOM A and Floppy Mezzanine Board [v1.0] for SC126 V1.0"

JM005B DOM and HighNibble VT132.jpg

JM005B DOM and HighNibble VT132_2.jpg


JM005B SC126 v1.0 Z180 Disk IO Daughterboard V1.0

JM005B SC126 v1.0 Z180 Disk IO Daughterboard2 V1.0

JM005B SC126 v1.0 Z180 Disk IO Daughterboard V1.0


ID Name Designator Footprint Quantity
1 16.0000 MHz X1 OSC-08 1
2 FLOPPY_IDC_34P P4 Z-231011034106 1
3 IDE 44 2X22 2MM VER B S3 2MM_HEADER_2X22 VER B 1
4 4.7K RP2 RPACK-SIP-PTH-8 1
6 3MM LED LED1 LED2-2.54-D5.0MM 1
7 74HCT138 U2,U1 PDIP-16 2
8 74HCT04 U6 DIP14 1
9 100nF C3,C4,C2,C5,C1,C6,C7,C8 CAP-RAD-2.54MM 8
10 WD37C65 U3 DIP-40_L52.3-W13.9-P2.54-LS15.2-BL 1
11 Jumper_Dual JP7,JP3,JP2,JP1,JP8,JP4 HDR-3X1/2.54 6
12 Extra RC80 Card Socket S1 RC2014-HDR-2X40-S-F-R-2.54MM 1
13 RC80 Card Socket S2 RC2014-HDR-2X40-S-F-R-2.54MM 1
14 74HCT688 U5 DIP20 1
15 10K R3,R2,R4 RES-TH_BD1.8-L3.2-P7.20-D0.4 3
16 470 R1 RES-TH_BD1.8-L3.2-P7.20-D0.4 1
17 4.7K R6,R5 RES-TH_BD1.8-L3.2-P7.20-D0.4 2
18 Header-Male-2.54_2x6 P1 HDR-TH_12P-P2.54-V-R2-C6-S2.54 1
19 82C55A_PLCC U4 PLCC44 1
20 Header-Male-2.54_2x8 P2 HDR-TH_16P-P2.54-V-M-R2-C8-S2.54 1
21 74HCT125 U7 PDIP-14 1


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