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STD Amiga 500 (plus) 68000 Relocator with Ranger Memory ($C00000-$D7FFFF)
Mode: Editors' pick
- 3
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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| 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 |
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