Specifications

CHAPTER 2
Hardware Design
Hardware Overview 13
Figure 2-3 Detailed block diagram—12” card
PCI muxed
address/
data bus
Macintosh
PCI bus
connector
[31:0]
Data
[63:0]
Address[31:0]
Data
cache
Data
path IC
Latch
Connector
Game port
Connector
DRAM
8 MB
168-pin DRAM
DIMM
PCI muxed
address/
data bus
Optional
audio cable
Ribbon cable
for video out
Pentium-class
processor
PCI muxed address/data bus
Memory
data
Memory
address
Memory data[63:0]
Tag
data (8)
[31:0]
[31:0]
Memory
address (12)
XA[23:9]
XA[23:0]
XD[8:0]
Cache
tags
VGA
accelerator
(built-in
RAMDAC)
SIO ISA bus

& PCI data
bridge
Video
DRAM
1 MB
Memory
controller &

PCI bridge
Sound Blaster
compatible
audio IC
(plus game timer)
8242
keyboard
control
Buffer
Mustard ASIC
PCI bus bridge I/F
Address translation
Keyboard/mouse emulation
Serial ports A/B emulation
Parallel port emulation
PC legacy logic
Message mailbox
Reset block
Interrupt register and mask
9
18
26
1
10
19
Macintosh/PC
video out
Video
mux
External
loopback
Macintosh
video in
Audio Audio
Berlin adapter
video buffering
GIMO
connector
Video
buffer
Address