EINTR.net / systems / compaq / presario433

Compaq Presario 433

I don't consider this low-cost, all-in-one computer from Compaq a proper *nix workstation. But I think it deserved this page because of the interesting form factor.


Compaq Presario 433's front view Compaq Presario 433's back view Compaq Presario 433's motherboard Compaq Presario 433's empty motherboard drawer Compaq Presario 433's drawer with motherboard and riser card Compaq Presario 433's drawer complete Compaq Presario 433's 16 bits ISA riser card
i486SX 33Mhz top view (486 socket) i486DX2 66MHz top view (486 socket) Evergreen 586 - AMD 5x86 133MHz top view Evergreen 586 - AMD 5x86 133MHz bottom view



CPU 133 MHz AMD 5x86 P75 - Evergreen 586 packaging makes it compatible with the 486 PGA Socket
FSB 33 MHz (or 25MHz) (Supports 5V CPU, Socket 486/1 compatible, running at a fixed multiplicator of these 2 speeds)
Memory 20 MB (max 20 MB - 4 MB on board + 2 x (1, 2, 4 or 8 MB FPM 72 pins SIMM 60-70ns)
Bus 16 bits ISA (not PnP) - 2 slots on a riser card
Video Cirrus Logic CL-GD5420 512K SVGA capable (800x600: 256 colors) built-in 14" monitor with inactivity timeout.
Sound Standard PC beeper
Microsoft Sound System (do not know it's capability) [not supported in OpenBSD]
Disk Controller 1 x ATA controller [generic wdc driver in OpenBSD, standard master/slave capable]
internal 40 pin male connector [single hard-disk short cable provided]
Case All-in-One Computer
1 x 3.5 inch floppy drive
1 x half-height IDE hard-drive
External Connectors [Compaq Presario 433 back connectors picture]
Bottom row, from left to right:
  1. PS/2 keyboard - 6 pin mini-DIN female connector
  2. PS/2 mouse - 6 pin mini-DIN female connector
  3. COM1 serial port - DB9 male connector
  4. LPT1 parallel port - DB25 female connector
  5. Game port (joystick) - DB15 female connector
  6. COM2 internal 2400 baud fax-modem - left: line in, right: handset [factory option]


OpenBSD 6.9-stable (CPAQ69) #1: Thu May 13 15:06:30 EDT 2021
real mem  = 20504576 (19MB)
avail mem = 16220160 (15MB)
random: good seed from bootblocks
mainbus0 at root
bios0 at mainbus0: date 12/30/93
bios0: ROM list: 0xc0000/0x8000
cpu0 at mainbus0: (uniprocessor)
cpu0: AMD Am5x86 W/T 133/160 ("AuthenticAMD" 486-class), 04-0e-04
cpu0: FPU
isa0 at mainbus0
isadma0 at isa0
fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
com0 at isa0 port 0x3f8/8 irq 4: ns16450, no fifo
com1 at isa0 port 0x2f8/8 irq 3: ns16450, no fifo
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0: console keyboard
vga0 at isa0 port 0x3b0/48 iomem 0xa0000/131072
wsdisplay0 at vga0 mux 1: console (80x25, vt100 emulation), using wskbd0
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
wdc0 at isa0 port 0x1f0/8 irq 14
wd0 at wdc0 channel 0 drive 0: <WDC WD1200BEVE-00A0HT0>
wd0: 16-sector PIO, LBA48, 114473MB, 234441648 sectors
wd0(wdc0:0:0): using BIOS timings
ne2 at isa0 port 0x280/32 irq 5, NE2000 (RTL8019), address 00:60:67:25:b8:b8
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16
root on wd0a (6b51e7e6facba0d5.a) swap on wd0b dump on wd0b
fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec


Jumpers Markings


	P1	1-2	25 MHz
		2-3	33 MHz

	P2	1-2	PQFP	# Soldered CPU only
		2-3	PGA	# Socket 486/1 used

	P3-P4	1-2	ODP/ODPR
		2-3	SX(PGA)

	P5	1-2	ODPR	# 168 pins OverDrive Processor Replacement
		2-3	ODP	# 169 pins OverDrive Processor
		3-4	SX(PGA)


	Original 486SX  33MHz:	P1:2-3	P2:2-3	P3-P4:2-3	P5:3-4	P6:1-2
	Upgraded 486DX2 66MHz:	P1:2-3	P2:2-3	P3-P4:1-2	P5:1-2	P6:1-2

	Evergreen 586 / AMD 5x86 133MHz
		Motherboard:	P1:2-3	P2:2-3	P3-P4:1-2	P5:1-2	P6:1-2
		Evergreen:	WT	4X	NORMAL

Evergreen 586:

	WB	# Write-Back Cache	[Late 486 CPU and motherboard feature]
	WT	# Write-Throught Cache	[Early 486 motherboard]

	4X	# Speed multiplicator for CPU

	OVRDRV	# Raise signal to disable the original CPU

(c) Hugo Villeneuve
$Id: index.html,v 1.22 2021/05/14 04:03:19 harpagon Exp $

All pictures are "(c) 2010 Hugo Villeneuve". Pictures are free to use for non-commerical purpose if copyright notice is kept. Use in any online auctions is forbidden.