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ISA Super VGA

Overview


The ISA Super VGA card is based on the Trident TVGA9000i Super VGA controller IC. It offers excellent compatibility with the original IBM VGA, as well as a good emulation of older CGA, EGA, Hercules and MDA adapters. The ISA Super VGA card was designed to be used with the Xi 8088 Processor Board, but it also works in some IBM XT clones. It will work in 16-bit ISA slots of AT-compatible computers, but its performance will be inferior to 16-bit VGA cards.

Note: A rework is required to make this card work in the original IBM PC and IBM XT computers, please see Errata section below.

Picture

Specifications

  • Supports 256 KiB or 512 KiB video memory using two or four 256 Kbit x 4 DRAM ICs.
  • 8088-friendly VGA BIOS.
  • Only 6 ICs (SVGA IC, BIOS, four DRAM chips), some capacitors, resistors and inductors.

Bill of Materials

 Component Type
 Reference Description Quantity Possible sources and notes
 PCB  ISA Super VGA PCB
 1 Refer to the RetroBrew Computers Board Inventory page for ordering information, or order from a PCB manufacturer of your choice using provided Gerber or KiCad files. Here is OSH Park project link.
 Integrated Circuit
 U1 Trident TVGA9000i-3
 1 Utsource or other component dealers. Other TVGA9000i versions can be used (e.g. TVGA9000i-1)
 Integrated Circuit
 U2 27C256 UV erasable EPROM or OTP ROM
 1 Unicorn Electronics, Jameco, Mouser (OTP ROM)
 Integrated Circuit
 U3 - U6
 Micron MT4C4256, Motorola MCM514256, or similar 256 Kbit x 4 DRAM, 70ns or less
 2 or 4
 Unicorn Electronics
 Install 4 for the total memory of 512 KiB or two for 256 KiB
 Capacitor C1 - C12
 0.1 uF ceramic, 5.08 mm pitch 12 Mouser 810-FK28X7R1H104K
 Capacitor C13 - C16
 10 uF, 16V, multilayer ceramic or tantalum, 5.08 mm pitch 4 Mouser 810-FK24X5R1C106K
 Capacitor C17 1 nF ceramic, 5.08 mm pitch 1 Mouser 810-FK28C0G2A102J
 Capacitor C18
 470 pF ceramic, 5.08 mm pitch 1 Mouser 810-FK28C0G1H471J
 Capacitor C19
 100 pF ceramic, 5.08 mm pitch
 1 Mouser 810-FK28C0G1H101J
 Capacitor C20 - C27
 47 pF ceramic, 5.08 mm pitch 8 Mouser 810-FK28C0G1H470J
 Resistor R1 - R8
 4.7 k, 1/4 W 8 Mouser 291-4.7K-RC
 Resistor R9 1 k, 1/4 W
 1 Mouser 291-1K-RC
 Resistor R10 - R13
 150 Ohm, 1/4 W
 4 Mouser 291-150-RC
 Resistor R14 100 Ohm, 1/4 W
 1 Mouser 291-100-RC
 Resistor R15, R16
 33 Ohm, 1/4 W
 2 Mouser 291-33-RC
 Connector P1 DE15F, right angle PCB mount 1 Mouser 806-K66X-E15S-NJVESA571-1-1734344-1 (blue color), 806-K66X-E15S-NJ30
 Connector JP1 2 pin header 1 Mouser 649-68002-102HLF
 Inductor L1, L3
 5.7 uH
 2 Mouser 542-78F5R6J-RC
 Inductor L2 2.7 uH
 1 Mouser 542-78F2R7-RC
 Filter FB1 - FB6
 EMI Filter Bead
 6 Mouser 623-2743001112LF
 Crystal X1 40 MHz
 1 Mouser 815-ABL-40-B2
 IC Socket U2 28 pin 600 mil (wide) DIP socket  1 Mouser 517-4828-6000-CP
 IC Socket U3 - U6
 20 pin 300 mil (narrow) DIP socket
 4 Mouser 517-4820-3000-CP
 Bracket  ISA card bracket - Keystone 9200-1  1 Mouser 534-9200-1

Changes


Version 1.1

  • Fix ALE errata. ALE signal is now connected to 5V
  • Slightly move VGA DE-9F connector (about 1.27 mm up and 0.8 mm back) to better comply with ISA card size and bracket placement specifications

Version 1.0

  • Minor board modifications around JP1

Errata

Version 1.0

  • The original IBM PC, the original IBM XT, and XT clones that closely follow IBM XT schematic do not implement the ALE signal properly. In these computers the ALE signal occasionally activated during DMA cycles, for example during memory refresh, while the address on the address bus is invalid. This confuses the Trident TVGA controller. The following rework is required to make ISA Super VGA work in these computers: The TVGA9000 ALE signal needs to be disconnected from the ISA ALE signal, and connected to the 5V power signal. The photo below shows such modification (photo credit: keropi at VCF forum).



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Sergey Kiselev,
Apr 5, 2013, 8:30 PM
Ċ
Sergey Kiselev,
Apr 5, 2013, 8:30 PM
Ċ
Sergey Kiselev,
Dec 20, 2017, 8:59 PM
ą
Sergey Kiselev,
Apr 2, 2013, 3:03 PM
ċ
ISA SVGA - Gerber - 1.1.zip
(178k)
Sergey Kiselev,
Dec 20, 2017, 8:59 PM
ċ
ISA SVGA - KiCad - 0.9.zip
(86k)
Sergey Kiselev,
Apr 5, 2013, 8:30 PM
ċ
ISA SVGA - KiCad - 1.0.zip
(87k)
Sergey Kiselev,
Apr 5, 2013, 11:47 PM
ċ
ISA SVGA - KiCad - 1.1.zip
(119k)
Sergey Kiselev,
Dec 20, 2017, 8:59 PM
Ċ
Sergey Kiselev,
Feb 14, 2013, 1:49 PM
Ċ
Sergey Kiselev,
Dec 20, 2017, 8:59 PM
ċ
ISA SVGA - gerber - 0.9.zip
(135k)
Sergey Kiselev,
Apr 5, 2013, 8:30 PM
ċ
ISA SVGA - gerber - 1.0.zip
(137k)
Sergey Kiselev,
Apr 5, 2013, 11:47 PM
ċ
tvga9000i - D3.51.bin
(32k)
Sergey Kiselev,
Apr 2, 2013, 10:25 PM
ċ
tvga9000i - D4.01E.bin
(32k)
Sergey Kiselev,
Apr 2, 2013, 10:25 PM
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