| Title: | AMIGA NOTES |
| Notice: | Join us in the *NEW* conference - HYDRA::AMIGA_V2 |
| Moderator: | HYDRA::MOORE |
| Created: | Sat Apr 26 1986 |
| Last Modified: | Wed Feb 05 1992 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 5378 |
| Total number of notes: | 38326 |
Lately I've seen 1.8 Meg memory expansions for the Amiga 500 advertised that
will plug into the A501 slot on the bottom of the machine and bring the total
A500 mem to 2.3 Megs.
I'd like to understand how these work as I'm toying with the idea of making my
own memory expansion .It seems to me adding additional memory here would be
easier than connecting to the expansion port or to the 68000 socket.
Can anyone answer/speculate on the following ?
1. Is the added memory chip , fast or half fast ?
2. Why 1.8 Megs .I can understand increments of 1/2 Meg etc but where does 1.8
Megs come from.
3. What is the maximum memory that can be added to the A501 connector .
4. Would I be right in assuming that this memory added to the A501 slot
would use existing multiplexed row and coloumn address lines and so
would not have to generate it's own. And also that the refresh would
not have to be externally generated.
5. Does this memory , over and abouve the normal A501's 1/2 Meg , autoconfig.
Thanx for any help
Steve..
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 3206.1 | BAGELS::BRANNON | Dave Brannon | Mon Dec 11 1989 21:28 | 11 | |
pure speculation:
o that A501 slot sits on the chip bus and is designed for 512K RAM.
o there are only address lines for 1 Meg of chip ram at the A501 slot.
Is it possible that they could be doing some sort of autoconfig
so that the system would put that extra memory in the fast memory
address range, even if it is sitting on the chip bus?
-Dave
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