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Description
MIDI-FORGE Rhapsody: 28MB AWE64 memory expansion
Upgrade your vintage soundcard with this 28MB memory expansion to store sound fonts in DOS and Windows. The MIDI FORGE Rhapsody is compatible with Sound Blaster AWE64 sound cards released in 1996/97.
The EMU8000 can only address 28MB in total, but this board will get you there to load the largest sound fonts available for the Sound Blaster AWE64.
The compiled GAL Equations (*.JED) can be found under "Other files for Assembly". The source code and the schematics are attached as well.
For more information, visit my website: https://bitsundbolts.com/2025/07/06/another-awe64-28mb-expansion-midi-forge-rhapsody/
YT video: - coming soon -
Cheers,
BitsUndBolts
Code
GAL Equations
Textile
; Title: AWE64 Memory Interface GAL
; Author: Bits Und Bolts
; Date: April 2025
; Description: Configures 32MB DRAM (4 groups, 16 chips, 4M x 4, 2K-refresh) for AWE64 Value and Gold editions,
; achieving 28MB addressable memory. Compatible with PALASM 4 Market Release 1.5.
;---------------------------------- Declaration Segment -----------
TITLE AWE64_MEMORY_UPGRADE
PATTERN RHAPSODY
REVISION A
AUTHOR Bits Und Bolts
COMPANY Bits Und Bolts
DATE 28/04/25
CHIP AWE64Memory PALCE16V8
; Inputs
PIN 1 A11 ; Address bit for group selection (1: Groups 1 & 2, 0: Groups 3 & 4)
PIN 2 A10 ; Address bit for group selection (1: Groups 2 & 4, 0: Groups 1 & 3)
PIN 3 /RAS ; Row Address Strobe (active-low)
PIN 7 BASEM0 ; Base memory enable (see table below for details)
PIN 8 /CAS ; Column Address Strobe (active-low)
PIN 9 BASEM1 ; Base memory enable (see table below for details)
;
; BASEM1 and BASEM0 will determine the amount of DRAM available on the sound card
;
; BASEM1 BASEM0 On-Board Memory
; 0 0 8MB (unknown)
; 0 1 4MB (Gold)
; 1 0 2MB (Value)
; 1 1 0MB (Value)
; Outputs
PIN 12 /CAS2 ; CAS for Groups 1 & 3 (A11 = 0)
PIN 13 /CAS0 ; CAS for Groups 2 & 4 (A11 = 1)
PIN 14 /RAS0 ; RAS for Groups 1 & 2 (RA11 = 1)
PIN 15 CASD ; CAS driver signal
PIN 16 CBR ; CAS-before-RAS refresh (registered)
PIN 17 RA10 ; Latched A10 (registered)
PIN 18 RA11 ; Latched A11 (registered)
PIN 19 /RAS1 ; RAS for Groups 3 & 4 (RA11 = 0)
EQUATIONS
; Registered Outputs
RA11 = (/RAS * A11) + (RAS * RA11) ; Latch A11 when /RAS is active, hold otherwise
RA10 = (/RAS * A10) + (RAS * RA10) ; Latch A10 when /RAS is active, hold otherwise
CBR = (CASD * /RAS) + (/CASD * CBR) ; Detect CAS-before-RAS refresh cycles
; Combinatorial Outputs
CASD = /CAS ; Drive CAS signal
/CAS0 = /CAS + ( ( /(RA11 + A11 + RA10) * BASEM1 + A11 ) * /CBR ) ; Select Groups 2 & 4
/CAS2 = /CAS + ( ( /(RA11 + A11 + RA10) * BASEM1 + /A11 ) * /CBR ) ; Select Groups 1 & 3
/RAS0 = /RAS + ( RA11 * ( /CBR + /CAS ) ) ; Select Groups 1 & 2
/RAS1 = /RAS + ( /RA11 * ( /CBR + /CAS ) ) ; Select Groups 3 & 4
Schematic and Layout
Schematic_MIDI-FORGE-Rhapsody_2025-06-29.pdf
Jun 29,2025
413 views
MIDI-FORGE Rhapsody: 28MB AWE64 memory expansion
2 Layers PCB 73.2 x 124.5 mm FR-4, 1.6 mm, 1, Immersion gold, White Solder Mask, Black silkscreen
28MB memory expansion for your Creative Sound Blaster AWE64 to load sound fonts in DOS and Windows.
413
1
0
Published: Jun 29,2025
Standard PCB
Download Gerber file 8
BOM(Bill of materials)
Other files for Assembly
PCBWay Donate 10% cost To Author
File Last Updated: 2025/07/06 (GMT+8)
File update record
2025-07-0621:01:19
Other files for Assembly are updated.
Only PCB
PCB+Assembly
*PCBWay community is a sharing platform. We are not responsible for any design issues and parameter issues (board thickness, surface finish, etc.) you choose.
Under the
Attribution-MIT
License.
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