License

CERN Open Hardware License

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1M Linear Paged RAM ROM V3.0

1 year ago 437
  • Description
  • Documents
  • BOM
  • Attachments
  • Members
  • Comments

Description

This board combines the best features of currently available RC2014 memory boards in one:

  • One 512K memory chip which can be RAM or ROM (selected with 3 jumpers)
  • One 512K RAM chip
  • Select between linear and paged memory using a single jumper
  • Select between linear and paged memory in software (from Z80 or BusRaider)
  • Support for the PAGE pin on the RC2014 bus (with an optional pull-up selected via a jumper)

Plays nicely with the BusRaider.

https://github.com/robdobsn/LinearPagedRAMROM1MB

Documents

1M Linear/Paged RAM/ROM

1M Linear Paged RAM RAM V3.0 PCB

BOM

ID Name Designator Footprint Quantity
1 SJ_NC SJ1,SJ2 SJ_NC 2
2 74HCT670 U3,U4 DIP16 2
3 RC2014_Backplane_Std P1 HDR-2.54-1X40P 1
4 74HCT138N U7 DIP16 1
5 PAGE PULLUP J1 1X02_HEADER_2_54_THRU_NO_SILK 1
6 74HCT139N U5 DIP16 1
7 RC2014_Backplane_Pro_2 P2 HDR-2.54-1X40P 1
8 SN74HCT257N U9,U10 DIP16 2
9 74HCT74N U6 DIP14 1
10 10K R3 RESISTOR 1/4W 1
11 100nF C1,C2 PKG-CERAMIC CAPACITOR 6X2 2
12 AS6C4008-55SIN U2 DIP32 1
13 MM74HCT00N U8 DIP14 1
14 SST39SF040-70-4C-PHE U1 DIP32 1
15 A15 WR SEL P3 HDR-3X1/2.54_09MMHOLES 1
16 A14 WR SEL P4 HDR-3X1/2.54_09MMHOLES 1
17 AS13 SEL P5 HDR-3X1/2.54_09MMHOLES 1
18 PAGED ADDR SEL P6 HDR-3X1/2.54_09MMHOLES 1
19 MM74HCT32N U11 DIP14 1
20 RArray8 R1,R2 RESISTOR_ARRAY_SIP_9 2

Attachments

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Members

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