Amiga 500 (plus) 68000 Relocator with Ranger Memory ($C00000-$D7FFFF)

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STD Amiga 500 (plus) 68000 Relocator with Ranger Memory ($C00000-$D7FFFF)

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Update time： 2021-12-25 08:23:22

Creation time： 2018-01-24 08:18:49

Description

68000 relocator for the Amiga 500(+) with additional "Ranger" Memory .on the CPU bus (so not on the slow Chipmem bus). expansion will disable internal trapdoor expansions that are not set to chipmem (A500 jumper on mainpcb) output of U5 (memory decoder) Y0 - $80000-$87FFFF Y1 - $88000-$8FFFFF Y2 - $90000-$97FFFF Y3 - $98000-$9FFFFF Y4 - $C0000-$C7FFFF Y5 - $C8000-$CFFFFF Y6 - $D0000-$D7FFFF Y7 - $D8000-$DFFFFF In project Y4,Y5 and Y6 are used to select a memory chip. when selected, the /AS is kept high for the amiga mainboard, preventing gary to enable internal (slow mem) expansions. more on the memory layout of the amiga: https://www.amigacoding.com/index.php/Amiga_memory_map Status of Project, not tested

Design Drawing

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Amiga Ranger Relocator
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PCB

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BOM

BOM download Purchase Parts

ID	Name	Designator	Footprint	Quantity
1	CY62157ESL	U2,U3,U4	TSOP(II)-44	3
2	MC68000P	SOCKET,U1	DIP64-746-01	2
3	100nF	C1,C2,C3,C4,C5,C6,C7	C0603	7
4	1N4148WS	D1,D2,D3	SOD323F	3
5	Header-Male-2.54_1x2	P2	HDR-2X1/2.54	1
6	74F138D	U5	SOIC-16_150MIL	1
7	74HC10D	U6	SOIC-14_150MIL	1
8	74F32D	U7	SOIC-14_150MIL	1