1M Linear Paged RAM ROM V3.0 - EasyEDA open source hardware lab

Std edition 1M Linear Paged RAM ROM V3.0

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License: CERN Open Hardware License

Published Time: 2022-02-04 04:13:31

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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

Design Drawing

schematic diagram

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1M Linear/Paged RAM/ROM
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PCB

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1M Linear Paged RAM RAM V3.0 PCB
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BOM

BOM download Purchase Parts

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