Amiga Hardware Database
Home
Models
Expansions
Companies
Benchmarks
Search
About
en
|
de
Home
>
Expansions
>
SCSI, IDE and Floppy Controllers
>
Single Expansion
SCRAM 500
Company
Norman Jackson / MegaMicro, Australia
Amiga
A500
Interface
side expansion port
Autoconfig ID
4096 / 3,4
SCSI + RAM for A500, a public domain kitware project
schematics, building instructions and driver software are all published
custom logic (GALs, PALs, etc.) are not published, these chips have to be ordered from the author
the four custom logic chips:
Bertie - controls the memory autoconfigure logic
Cyril - 8 bit SCSI autoboot controller chip
Griswold - master timing controller for the DRAMs
Humphrey - controls RAM operation
SCSI controller
National Semiconductor DP8490V SCSI controller IC - an enhanced version of NCR 53C80
autoboot ROM - autobooting requires Kickstart 1.3
autoboot disable switch for older Kickstarts or for game compatibility
supports the Rigid Disk Block standard
external DB25 SCSI connector
SCSI access LED
termination power option - jumper selectable +5V on pin 25 for using passive terminator
non-DMA transfer
custom synchronising logic
memory
16 ZIP sockets accept up to 8 MB RAM
takes 256k×4 or 1M×4 ZIPs
ZIP sizes cannot be mixed
possible configurations are 0, 2, 4 or 8 MB
static column ZIPs work, but not improve performance
zero wait state
RAM access LED
autoconfigure LED
notes
connects to the side expansion port
passthrough connector is optional
the case is wide enough for a companion board, the SCRAM-Jet - a 030 accelerator with 32 bit RAM, but it was never published
works with the A1000
Driver / Installation Disk
SCRAM500.lzh
building instructions, schematics
user manual
driver software
676 kB
Vintage Advert
Advert (AU)
1991-12
Advert (AU)
1992-06