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Xi 8088
Page history
last edited
by Sergey Kiselev 1 year, 9 months ago
Introduction
Xi 8088 is an IBM PC/XT compatible processor board in ISA board form factor. It offers several enhancements over the standard IBM PC/XT, such as support of PS/2 keyboard and mouse and built-in real time clock with NVRAM (also known as CMOS setup memory).
Picture
Image: /f/1354638671/Xi%208088%20-%20Complete%20Board.jpg
Specifications
- Processor: Intel 8088 or compatible, NEC V20.
- Supports both standard 4.77MHz CPU clock and turbo, up to 13.33MHz CPU clock operation.
- Coprocessor: Intel 8087.
- RAM: Up to 832 KiB of usable system memory (640 KiB base memory, and up to 192 KiB UMB); Implemented using SRAM.
- ROM: 128 KiB flash ROM. Configurable to either 64 KiB or 128 KiB.
- 8-bit ISA interface with several ISA/AT signals
- PS/2 compatible keyboard and mouse controller
- One 8237 direct memory access controller (DMAC)
- Two 8259 programmable interrupt controllers (PICs), supporting the total of 15 interrupts; 10 interrupts available for extension cards
- One 8254 programmable interval timer (PIT)
- One DS12885/DS12887 real time clock and non-volatile RAM (RTC/NVRAM)
Firmware / BIOS
bios-0.8.tar.gz - Use bios128k-2.0.bin for programming new flash ROMs; use bios.bin with xiflash utility. Please refer to README.txt for more information about the BIOS.
xiflash-0.1.tar.gz - In system flash programming utility.
Hardware Documentation
Schematic
8088-SBC - Schematic - Color - 2.0.pdf
PCB Layout
8088-SBC - Board - Color - 2.0.pdf
Memory Map
Start Address
|
End Address
|
Size |
Purpose
|
Comments
|
0000h
|
9FFFFh
|
640 KiB |
Base memory
|
|
0A0000h
|
0BFFFFh
|
128 KiB |
Display memory
|
Actual addresses and size might vary depending on the type of the video adapter
|
0C0000h
|
0EFFFFh
|
192 KiB |
Upper memory blocks (UMB) and BIOS extension ROMs
|
Consists of six 32 KiB user configurable blocks, can be either mapped to SRAM (to be used as UMB) or used for BIOS extension ROMs
|
0E0000h
|
0EFFFFh
|
64 KiB |
On-board BIOS extension ROM
|
System flash ROM can be mapped here, so it can be used for BIOS extensions
|
0F0000h
|
0FFFFFh
|
64
KiB
|
System BIOS
|
Currently BIOS uses only top 32 KiB of this space (0F8000h - 0FFFFFh). The other 32 KiB part is mapped to the flash ROM and can be used for BIOS extensions
|
I/O Ports Map
Port Address
|
Device and/or Function
|
Write
|
Read |
00h
|
DMAC - Channel 0
|
Base/current address
|
Current address |
01h
|
DMAC - Channel 0 |
Base/current word count
|
Current word count |
02h
|
DMAC - Channel 1 |
Base/current address
|
Current address |
03h
|
DMAC - Channel 1
|
Base/current word count
|
Current word count |
04h
|
DMAC - Channel 2
|
Base/current address
|
Current address |
05h
|
DMAC - Channel 2
|
Base/current word count
|
Current word count |
| 06h |
DMAC - Channel 3
|
Base/current address
|
Current address |
| 07h |
DMAC - Channel 3
|
Base/current word count
|
Current word count |
| 08h |
DMAC - Command/Status Register |
Write command register |
Read status register |
| 09h |
DMAC - Request Register |
Write request register |
N/A |
| 0Ah |
DMAC - Single mask register bit |
Write single mask register bit |
N/A |
| 0Bh |
DMAC - More register |
Write mode register |
N/A |
| 0Ch |
DMAC - Clear byte pointer flip-flop |
Clear byte pointer flip-flop |
N/A
|
| 0Dh |
DMAC - Master clear/Read temporary register |
Master clear
|
Read temporary register |
| 0Eh |
DMAC - Clear mask register |
Clear mask register |
N/A |
| 0Fh |
DMAC - Write all mask register bits |
Write all mask register bits |
N/A |
| 10h-1Fh |
Alias for 00h-0Fh (DMAC) |
|
|
| 20h |
Master PIC |
|
|
| 21h |
Master PIC |
|
|
| 22h-3Fh |
Aliases for 20h-21h (Master PIC) |
|
|
| 40h |
PIT - Channel 0 |
|
|
| 41h |
PIT- Channel 1 |
|
|
| 42h |
PIT- Channel 2 |
|
|
| 43h |
PIT - Control Word
|
|
|
| 44h-5Fh |
Aliases for 40h-43h (PIT) |
|
|
| 60h |
Keyboard controller |
|
|
| 61h |
Port B - Bit 0
|
0 = Disable PIT Channel 2
1 = Enable PIT Channel 2
(Note: Channel 2 is connected to the speaker)
|
0 = PIT Channel 2 disabled
1 = PIT Channel 2 enabled
|
| |
Port B - Bit 1
|
0 = Disable speaker
1 = Enable speaker
|
0 = Speaker disabled
1 = Speaker enabled
|
| |
Port B - Bit 2
|
0 = Disable turbo mode
1 = Enable turbo mode
|
0 = Turbo mode disabled
1 = Turbo mode enabled
|
| |
Port B - Bit 3
|
0 = Disable I/O check NMI
1 = Enable I/O check NMI
(Note: Write 0 followed by 1 to clear the I/O check NMI state condition)
|
0 = I/O check NMI disabled
1 = I/O check NMI disabled
|
| |
Port B - Bit 4
|
N/A |
PIT Channel 0 output divided by 2
(Toggles every 15 µs)
|
| |
Port B - Bit 5
|
N/A |
PIT Channel 2 output
|
| |
Port B - Bit 6
|
N/A |
0 = No NMI from I/O check
1 = NMI from I/O check
|
| |
Port B - Bit 7
|
N./A |
Always reads as 0 |
| 62h-63h |
Aliases for 60h-61h |
|
|
| 64h |
Keyboard controller |
|
|
| 65h-6Fh |
Aliases for 60h-04h |
|
|
| 70h |
RTC/NVRAM address, NMI control |
|
|
| 71h |
RTC/NVRAM data |
|
|
| 72h-7Fh |
Aliases for 70h-71h (RTC) |
|
|
| 80h |
DMA Page Register - Channel 1, POST register |
|
|
| 81h |
DMA Page Register - Channel 1 |
|
|
| 82h |
DMA Page Register - Channel 1 |
|
|
| 83h |
Unused |
|
|
| 84h-9Fh |
Aliases to 80h-83h |
|
|
| 0A0h |
Slave PIC |
|
|
| 0A1h |
Slave PIC |
|
|
| 0A2h-0BFh |
Aliases to 0A0h-0A1h |
|
|
| 0C0h-0FFh |
Unused, reserved |
|
|
| 0100h-03FFh |
Available for extension cards |
|
|
Hardware Interrupts
Interrupt Number (IRQ#)
|
Default Software Interrupt Number |
Device
|
Comment
|
0
|
08h |
PIT - Channel 0
|
Default Frequency is 18.2 Hz
|
1
|
09h |
KBC - Keyboard
|
|
2
|
0Ah |
Cascade to Slave PIC
|
|
3
|
0Bh |
Available
|
|
4
|
0Ch |
Available
|
|
5
|
0Dh |
Available
|
|
6
|
0Eh |
Available
|
|
| 7 |
0Fh |
Available |
|
| 8 |
70h |
RTC |
|
| 9 |
71h |
Available |
BIOS redirects IRQ9 to IRQ2 vector |
| 10 |
72h |
Available |
|
| 11 |
73h |
Available |
|
| 12 |
74h |
KBC - PS/2 Mouse, or Available |
Can be configured using jumper J3 |
| 13 |
75h |
Math coprocessor exception |
BIOS redirects IRQ13 to NMI vector |
| 14 |
76h |
Available |
|
| 15 |
77h |
Available |
|
Jumpers, Connectors, and Switches
P1 - PS/2 Keyboard
Pin
|
Description
|
1
|
Keyboard data
|
| 2 |
Unused |
| 3 |
GND |
| 4 |
+5V |
| 5 |
Keyboard clock |
| 6 |
Unused |
P2 - PS/2 Mouse
Pin
|
Description
|
1
|
Mouse data
|
| 2 |
Unused |
| 3 |
GND |
| 4 |
+5V |
| 5 |
Mouse clock |
| 6 |
Unused |
P3 - Speaker
Pin
|
Description
|
1
|
Speaker output
|
2
|
Internal Speaker input *
|
3
|
Ground
|
| 4 |
+5V
|
*Note: To enable internal speaker connect a jumper across pins 1-2
P4 - Power LED
Pin
|
Description
|
1
|
LED's anode (+)
|
2
|
LED's cathode (-)
|
P5 - Turbo LED
Pin
|
Description
|
1
|
LED's anode (+)
|
2
|
LED's cathode (-)
|
J1 - Reset Switch
Pin
|
Description
|
1
|
Ground
|
2
|
Reset input
|
J2 - Turbo Switch
Position
|
Description
|
none
|
Turbo off
|
1-2
|
Turbo on
|
2-3*
|
Turbo is software controlled (Port 61h bit 2)
|
* Default setting
J3 - IRQ12
Position
|
Description
|
1-2*
|
IRQ12 is PS/2 mouse interrupt - connected to the keyboard controller
|
2-3*
|
IRQ12 is connected to the ISA bus
|
* Default setting
J4 - Enable ISA16 signals
Position
|
Description
|
1-2
|
/MEMW is connected to ISA C10 (/MEMW)
|
3-4
|
/MEMR is connected to ISA C9 (/MEMR)
|
5-6
|
LA17 is connected to ISA C8 (LA17)
|
7-8
|
LA18 is connected to ISA C7 (LA18)
|
9-10
|
LA19 is connected to ISA C6 (LA19)
|
11-12
|
ISA C2 - C5 (LA20 - LA23) are connected to ground
|
Note: Set all jumpers for Cirrus Logic GD542x VGA cards, remove for all other cards.
J5 - Clear NVRAM
Position
|
Description
|
none*
|
Normal operation
|
1-2
|
Clear NVRAM (CMOS setup memory)
|
* Default setting
SW1 - Reset Switch
Press SW1 to reset the system
SW2 - Memory Configurations Switch
| Position |
Description |
1
|
ON = Map 0C0000h-0C7FFFFh to RAM
|
2
|
ON = Map 0C8000h-0CFFFFFh to RAM
|
3
|
ON = Map 0D0000h-0D7FFFFh to RAM
|
4
|
ON = Map 0D8000h-0DFFFFFh to RAM
|
5
|
ON = Map 0E0000h-0E7FFFFh to RAM
|
6
|
ON = Map 0E0000h-0EFFFFFh to RAM
|
7
|
ON = 64 KiB ROM starting from 0F0000h
OFF = 128 KiB ROM starting from 0E0000h
|
8
|
ON = Monochrome display (MDA)
OFF = Color display (CGA)
|
Notes:
- SW2.7 must be ON if SW2.5 or SW2.6 are ON
- VGA BIOS is usually mapped to 0C0000h-0C7FFFFh, when using VGA SW2.1 must be OFF
SW3 - I/O Wait States Configuration Switch
Position
|
Description
|
1*
|
ON = 1 I/O wait state
|
2
|
ON = 2 I/O wait states
|
3
|
ON = 3 I/O wait states
|
4
|
ON = 4 I/O wait states
|
* Default
Note: One and only one of SW3 switches must be on
Bill of Materials (BOM)
BOM Notes
BOM
| Component type |
Reference
|
Description
|
Quantity
|
Possible sources and notes
|
| PCB |
|
Xi 8088 PCB Version 2.0 |
1 |
Order from Sergey |
| Battery Holder |
BT1
|
CR2032 batter holder, 20 mm lead spacing
|
1
|
Jameco 355434, Mouser 122-2620-GR, 122-2520-GR, 122-2420-GR, Radio Shack 270-009 |
Capacitor
|
C1 - C46
|
0.1 uF ceramic, 5.08 mm lead spacing
|
46
|
Mouser 810-FK28X7R1H104K, 80-C323C104K5R
Jameco 25523
|
Capacitor
|
C47 - C51
|
10 uF ceramic, 5.08 mm lead spacing
|
5
|
Mouser 810-FK24X5R1C106K
Note: Can be replaced with tantalum or electrolytic capacitors
|
Capacitor
|
C52, C53
|
33 pF ceramic, 5.08 mm lead spacing
|
2
|
Mouser 80-CK05BX330K-TR
Jameco 1947010
Note: Install only if using CMOS type of U1 82C84, for NMOS 8284 install R8 and R9 instead
|
Capacitor
|
C54
|
5-30 pF trimmer capacitor
|
1
|
Mouser 81-TZ03R300F169B00
Jameco 136979
|
Capacitor
|
C55-C58
|
47 pF ceramic, 5.08 mm lead spacing
|
4
|
Mouser 80-CK05BX470K-TR
Jameco 1947036
|
Capacitor
|
C59
|
0.01 uF ceramic, 5.08 mm lead spacing
|
1
|
Mouser 80-C322C103K1R5CA
Jameco 597281
|
| Diode |
D1 |
1N4148 |
1 |
Jameco 36038, 179215; Mouser 512-1N4148, 771-1N4148-T/R |
Diode
|
D2, D3
|
Bi-level LED indicator
|
1
|
Mouser 696-SSF-LXH240GYD
Jameco: Search for "Bi-Level LED", choose one with pins in square pattern (not in line)
|
| Fuse |
F1 |
1.1A polyfuse, 5.04 mm lead spacing |
1 |
Mouser 576-16R110BPR
Jameco 199912
|
Connector
|
J1, J2, P3, P4, P5
|
13x1 pin header
|
1
|
Mouser 649-68000-113HLF |
Connector
|
J3
|
3x1 pin header
|
1
|
Jameco 109576; Mouser 649-69190-103HLF, 649-78229-103HLF
|
Connector
|
J4
|
6x2 pin header
|
1
|
Mouser 649-68021-212HLF
|
Connector
|
J5
|
2x1 pin header
|
1
|
Jameco 108338; Mouser 649-78229-102HLF
|
Connector
|
P1
|
6 pin Mini-DIN connector (Purple)
|
1
|
Mouser 806-KMDGX-6S-BS2715C (Purple)
Jameco 119475 (Black)
|
Connector
|
P2
|
6 pin Mini-DIN connector (Green)
|
1
|
Mouser 806-KMDGX-6S-BS3395C (Green)
Jameco 119475 (Black)
|
| Transistor |
Q1 |
PN2222A |
1 |
Mouser 512-PN2222ATA |
Resistor
|
R1
|
100 kOhm, 1/4 W |
1
|
Mouser 291-100K-RC |
Resistor
|
R2, R4, R5
|
470 Ohm, 1/4 W |
3
|
Jameco 690785
Mouser 291-470-RC
|
Resistor
|
R3
|
10 kOhm, 1/4 W
|
1
|
Jameco 691104
Mouser 291-10K-RC
|
Resistor
|
R6
|
1 kOhm, 1/4 W |
1
|
Mouser 291-1K-RC
|
Resistor
|
R7
|
33 Ohm, 1/4 W |
1
|
Mouser 291-33-RC |
| Resistor |
R8, R9 |
510 Ohm, 1/4 W |
2 |
Mouser 291-510-RC
Note: Install only if using NMOS type of U1 8284, for CMOS 82C84 install C52 and C53 instead
|
Resistor Array
|
RR1 - RR3
|
10 kOhm, 10 pin, bussed resistor array |
3
|
Mouser 266-10K-RC
|
Resistor Array
|
RR4, RR5
|
10 kOhm, 6 pin, bussed resistor array |
2
|
Mouser 264-10K-RC |
Resistor Array
|
RR6
|
470 Ohm, 6 pin, bussed resistor array |
1
|
Mouser 264-470-RC |
| Speaker |
SP1 |
12 mm speaker |
1 |
Mouser 665-AT-1224TWTR |
Switch
|
SW1
|
6 mm tactile switch, right angle
|
1
|
Mouser 653-B3F-3152, |
Switch
|
SW2
|
8 positions DIP switch
|
1
|
Mouser 571-54356405 |
Switch
|
SW3
|
4 positions DIP switch
|
1
|
Mouser 506-54356402 |
IC
|
U1
|
8284 or 82C84 clock generator
|
1
|
Avnet Express Intersil CP82C84AZ
Unicron Electronics (82C84)
|
IC
|
U2
|
8088, 80C88, NEC V20, or NEC V20HL CPU
|
1
|
Jameco 34358 (NEC V20, 8 Mhz), 52169 (8088, 8 MHz), 52142 (8088, 5 MHz)
Unicorn Electronics
Avnet Express Intersil IP80C88
Utsource, eBay
|
IC
|
U3
|
8087 FPU
|
1
|
8087 FPU is an optional part
Unicorn Electronics, Utsource, eBay
|
IC
|
U4
|
8288 or 82C88 bus controller
|
1
|
Avnet Express Intersil CP82C88Z
Unicorn Electronics 82C88
Note: AMD 8288 part is not recommended
|
IC
|
U5, U6
|
8259 or 82C59 PIC
|
2
|
Avnet Express Intersil CP82C59A-12Z
Jameco 52775
Unicorn Electronics 82C59 or 8259
|
| IC |
U7 |
8237 or 82C37 DMAC |
1 |
Unicorn Electronics 82C37 or 8237
eBay
|
IC
|
U8
|
8254 or 82C54 PIT
|
1
|
Mouser 968-CP82C54-10Z
Avnet Express CP82C54
Jameco 52716, 52708
Unicorn Electronics 82C54 or 8254
|
IC
|
U9
|
8242, 82C42, VT82C42N, HT6542B
|
1
|
Note: Original 8242 and 82C42 chips (usually made by Intel, Mitsubishi, or NEC) are generic mircocontrollers. Make sure to get one with PS/2 keyboard controller firmware, or use a dedicated keyboard controller, such as VIA VT82C42N (recommended).
|
IC
|
U10
|
DS12885 or DS12887
|
1
|
Mouser 700-DS12885N
Mouser 700-DS12887A
Avnet Express DS12885N+
Avnet Express DS12887A+
Jameco 1194513, 1194492 (DS12885)
Jameco 133452 (DS12887)
Note: DS12887 has a built-in battery and 32768 Hz crystal, no need to install BT1 and X2
|
IC
|
U11, U12
|
512 KiB SRAM, 32 pin DIP - AS6C4008-55PCN |
2
|
Mouser 913-AS6C4008-55PCN
Jameco 1927617
|
IC
|
U13
|
128 KiB flash, 32 pin DIP - 39SF010, 29F010, 29C010
|
1
|
Mouser 804-39SF010A7CPHE, 804-GLS29EE010-70PHE
Jameco 242608, 242595, 242587
|
IC
|
U14
|
74LS670 or 74HCT670
|
1
|
Mouser 595-SN74LS670N, 771-HCT670N652
Unicorn Electronics 74LS670
|
IC
|
U15 - U17
|
74F573 or 74ACT573
|
3
|
Mouser 595-SN74F573NE4, 595-SN74F573N, 595-SN74ACT573N, 595-CD74ACT573E
Jameco 282642
Unicorn Electronics 74F573
|
IC
|
U18 - U21
|
74F245 or 74ACT245
|
4
|
Mouser 595-SN74F245N, 771-NF245N602, 595-SN74ACT245N, 595-CD74ACT245E
Jameco 287144
Unicorn Electronics 74F245
|
IC
|
U22, U23
|
74F244 or 74ACT244
|
2
|
Mouser 595-SN74F244N, 771-NF244N602, 595-SN74ACT244N, 595-CD74ACT244E, 863-MC74ACT244NG
Jameco 212054
Unicorn Electronics 74F244
|
| IC |
U24 - U26 |
74ALS175, 74AHCT175, or 74ACT175 |
3
|
Mouser 595-SN74ALS175NE4, 595-SN74ALS175N, 595-CD74ACT175E
Unicorn Electronics 74ALS175, 74AHCT175
|
IC
|
U27, U28
|
74ALS139 or 74AHCT139
|
2 |
Mouser 595-SN74ALS139N, 595-SN74AHCT139N
Jameco 46623, 301268, 63773, 239011
Unicorn Electronics 74ALS139
|
IC
|
U29
|
74ALS138 or 74AHCT138
|
1
|
Mouser 595-SN74ALS138AN, 512-DM74ALS138N, 595-SN74AHCT138N
Jameco 46607, 46608, 301233, 44927
Unicorn Electronics 74ALS138, 74AHCT138
|
IC
|
U30
|
74LS92
|
1
|
Mouser 595-SN74LS92NE4
Jameco 48143
Unicorn Electronics 74LS92
|
IC
|
U31 - U33
|
74ALS74 or 74AHCT74
|
3
|
Mouser 595-SN74ALS74AN, 512-DM74ALS74AN, 595-SN74AHCT74N
Unicorn Electronics 74ALS74, 74AHCT74
|
IC
|
U34, U35
|
74ALS32 or 74AHCT32
|
2
|
Mouser 595-SN74ALS32N, 512-DM74ALS32N, 595-SN74AHCT32N
Jameco 44134, 47466, 47467, 295515
Unicorn Electronics 74ALS32, 74AHCT32
|
IC
|
U36
|
74ALS20 or 74ACT20
|
1
|
Mouser 595-SN74ALS20ANE4, 595-SN74ALS20AN, 595-CD74ACT20EE4, 595-CD74ACT20E
Unicorn Electronics 74ALS20
|
IC
|
U37
|
74ALS11, 74AHCT11, or 74ACT11
|
1
|
Mouser 595-SN74ALS11AN, 595-SN74ACT11N
Unicorn Electronics 74ALS11
|
IC
|
U38
|
74LS06
|
1
|
Mouser 595-SN74LS06N
Jameco 46359
Unicorn Electronics 74LS06
|
| IC |
U39 |
74F04, 74ACT04 |
1 |
Mouser 595-SN74F04N, 595-SN74ACT04N
Note: This IC should have higher output current (about 20 mA), 74LS04, 74ALS04, or 74AHCT04 can be used, but it might result in stability issues especially on higher CPU frequency.
|
IC
|
U40
|
74ALS04, 74AHCT04
|
1
|
Mouser 595-SN74ALS04BNE4, 595-SN74ALS04BN, 595-SN74AHCT04NE4
Jameco 970621
Unicorn Electronics 74ALS04, 74AHCT04
|
IC
|
U41, U42
|
74ALS02, 74AHCT02
|
2
|
Mouser 595-SN74ALS02ANE4, 595-SN74ALS02AN, 595-SN74AHCT02N
Unicorn Electronics 74ALS02, 74AHCT02
|
IC
|
U43 - U45
|
74ALS00, 74AHCT00
|
3
|
Mouser 595-SN74ALS00AN, 595-SN74AHCT00NE4, 595-SN74AHCT00N
Jameco 245294
Unicorn Electronics 74ALS00, 74AHCT00
|
Crystal Oscillator
|
U46
|
Turbo clock oscillator
24 MHz
|
1
|
Note: U46 frequency should be desired CPU turbo frequency multiplied by 3 (24 MHz for 8 MHz CPU, 30 MHz for 10 MHz CPU, etc.
Mouser 774-MXO45-3C-24.0 (24 MHz)
Jameco 2135321 (24 MHz), 325438 (30 MHz)
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IC Socket
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U2, U3, U7, U9
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40 pin 600 mil DIP socket
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4
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Mouser 517-4840-6000-CP, 649-DILB40P223TLF
Jameco 41111
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IC Socket
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U11 - U13
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32 pin 600 mil DIP socket
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3
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Mouser 517-4832-6000-CP, 649-DILB32P223TL
Jameco 112301
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IC Socket
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U5, U6
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28 pin 600 mil DIP socket |
2
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Mouser 517-4828-6000-CP, 649-DILB28P223TLF
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IC Socket
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U8, U10
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24 pin 600 mil DIP socket |
2
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Mouser 517-4824-6000-CP
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IC Socket
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U4, U15 - U23
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20 pin 300 mil DIP socket |
10
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Mouser 517-4820-3000-CP, 649-DILB20P-223TLF
Jameco 112248
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IC Socket
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U1
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18 pin 300 mil DIP socket |
1
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Mouser 517-4818-3000-CP |
IC Socket
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U14, U24 - U29
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16 pin 300 mil DIP socket |
7
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Mouser 517-4816-3000-CP, 649-DILB16P-223TLF
Jameco 37373
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IC Socket
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U30 - U45
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14 pin 300 mil DIP socket |
16
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Jameco 37162
Mouser 517-4814-3000-CP, 649-DILB14P-223TLF
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Oscillator Socket
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U46
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4 pin 300 mil DIP full can oscillator socket
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1
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Mouser 535-1107741
Jameco 133006
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Crystal
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X1
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14.31818 MHz AT cut crystal
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1
|
Mouser 73-XT49S1431-20 |
Crystal
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X2
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32768 Hz tune fork crystal
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1
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Mouser 732-C002RX32.76K-EPB, 695-CFS206-327KB-U
Jameco 14584
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ISA Mounting Bracket
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Keystone 9205
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1
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Mouser 534-9205
Need to drill holes for PS/2 connectors, LEDs and the reset switch
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Screw
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HOLE1, HOLE2
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Screw 4-40 diameter, 1/4" length
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1
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Mouser 534-9900 |
Replacement Notes
- Intel 8xxx ICs - Either CMOS (8xCxx) or NMOS/TTL ICs can be used. CMOS and particularly NEC V20 CPU and Intersil 82Cxx peripheral ICs are preferred because of their lower power consumption and higher performance
- 74xx logic ICs - Advanced TTL-LS (74ALS, 74F) or advanced TTL compatible CMOS (74AHCT, 74ACT) are recommended, especially for turbo CPU clock frequencies. Some parts (74LS92, 74LS06, 74LS670) are not available in these series, so regular 74LS and 74HCT should be used. With that being said most of logic parts are not very speed sensitive, especially if running on standard 4.77 MHz clock, with exception of 74ALS74 in wait state generator, so generally 74LS series ICs can be used. 74F and 74ACT are preferred parts for bus driving circuits (74x244, 74x245, 74x573)
- For higher clock frequency (more than 8 MHz) along with 74ALS or 74AHCT for most logic, it is recommended to use faster U31, U32, U24 and U25. For example 74F or 74ACT series.
µ
Xi 8088
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Comments (2)
at 1:42 pm on Oct 2, 2012
Reply
Is it in any way useable with DOS?
at 2:07 pm on Oct 2, 2012
Reply
Since Xi 8088 is an IBM PC/XT compatible board it does support MS-DOS and programs written for MS-DOS. At least long as these programs use only 8088 or V20 instructions (depending on the CPU type you're using). In other words do not expect a 286+ protected mode software to run on it.
More than that, it is *very* compatible on hardware level, so programs that use hardware directly bypassing DOS/BIOS APIs work on this board. (Many MS-DOS programs, and especially games use hardware directly).