ENSONIQ ASR-10 Service Manual

SIMM Information
Are they DRAM SIMMs?
When adding memory, only install DRAM SIMMs in the expansion slots. The ASR will not accept
static RAM or ROMs.
How Many DRAM Chips (New Rev)?
It doesn’t matter how many (what size) DRAM chips are on the SIMM. The 1 MegaByte SIMiMs can
be based on either 1 Megabit (8 chips) or 4 Megabit ( 2 chips) DRAM chips and the 4 MegaByte
SIMMs can be based on either 4 Megabit (8 chips) or 16 Megabit (2 chips) DRAM chips. You can
choose to use two of the 8 chip parts and two of the 2 chip parts if desired.
It is not possible to mix 1 MegaByte and 4 MegaByte SIMM in a new Rev ASR board.
How Many DRAM Chips (Old Rev)?
The old rev board can only use 8 chip parts for either the 1 MegaByte and the 4 Megtiyte SIMMs.
You can mix the 1 Megbyte and 4 Megabyte SIMMs, as long as they are used in pairs (two of each).
Are the DRAMS all on one side of the SIMM?
Use SIMMs with DRAMS all on one side. DRAMS on both sides of the SIMM may not fit
and therefore will not operate properly, and may cause damage to the ASR. Note that
T.S.O.P. S&Ills (chips on both sides) will work with the ASR because the chips are very
thin.
Are they Composite SIMMs?
Do not use Composite SIMMs. They will not operate properly with an ASR.
What is the Access Speed of the SIMMs?
We recommend using SIMMs with an access speed of 80 nanoseconds or faster.
Internal Memory
As it comes out of the box, the ASR-10 contains 2 MegaEJytes or 1 MegaWord of internal
memory (a word is one single sample, or 16 bits). That’s enough for 31.5 (mono) or 15.75
(stereo) seconds of sampling at a 29.8 KHz sample rate, or about 400,000 notes of sequencer
memory.
This internal memory is shared by sounds and the sequencer. The memory is distributed
dynamically between instruments and sequences, which means that the more sounds you have in
memory, the less sequencer memory you have, and vice versa.
Expanding the ASR-10 Memory
If you want to expand the memory, the ASR-10 can address up to 16 MegaBytes/8 MegaWords,
using industry standard lm x 8 or 4m x 8 non-parity SIMMs. There are four different memory
allocations, as shown below:
SIMMS 1 m x 8 (standard) lmx8 4mx8
# of SIMMS Used tW0 four tW0
Mega Bytes 2
4 8
Mega Words 1 2 4
Blocks 3,600’ 7700. 15900’
l Actual block count may vary due to different OS. Versions.
4mx8
four
16
8
31250’
Accessing SlMMs (new Rev board)
To access the SIMMs an ASR-10 keyboard , make sure all cables, especially the power cable,
are unpluggedfrom the ASR-IO. Turn the unit upside down on a soft surface with the keys
facing away from you. Remove the two screws holding the trap door and remove the trap door
from the bottom of the ASR-10.
On an ASR-10 Rack access is gained by removing the entire top
case. As it comes from the factory, the ASR-10 will look like this underneath the trap door:
ASR Service Manual 69

ENSONIQ ASR-10 Specifications

General

Brand	ENSONIQ
Model	ASR-10
Category	Recording Equipment
Language	English