I got these from a vga test program (0.74) \ VOGONS

I got these from a vga test program (0.74)

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First post, by lucky7456969

Posted on 2010-08-27, 09:49

lucky7456969 Offline

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Posts: 641
Joined: 2009-09-10, 05:49

My Config is:
Core i5 750
DDR3-1600
Radeon HD 5770

This software is called VGA Compability Test By Kent Quirk

By Ziff Communications Company written in 1988

VGA Test file 123.err
Test 6: BIOS: Text Input/Output
Mode 11h Read/Write ChAttr: expected char=65, got char=0
Mode 11h Read/Write ChAttr: expected char=67, got char=0
Mode 11h Read/Write ChAttr: expected char=69, got char=0
Mode 11h Read/Write ChAttr: expected char=71, got char=0
Mode 11h Read/Write ChAttr: expected char=73, got char=0
Mode 11h Read/Write ChAttr: expected char=75, got char=0
Mode 11h Read/Write ChAttr: expected char=77, got char=0
Mode 11h Read/Write ChAttr: expected char=79, got char=0
Mode 11h Read/Write ChAttr: expected char=81, got char=0
Mode 11h Read/Write ChAttr: expected char=83, got char=0
Mode 11h Read/Write ChAttr: expected char=85, got char=0
Mode 11h Read/Write ChAttr: expected char=87, got char=0
Mode 11h Read/Write ChAttr: expected char=89, got char=0
Mode 11h Read/Write ChAttr: expected char=91, got char=0
Mode 11h Read/Write ChAttr: expected char=93, got char=0
Test 13: Hardware: General Registers
Expected vertical interrupt 35-40 times in 1/2 sec; got 0.
There were 2 tests that had errors.

are these known issues?
Thanks
Jack

Reply 1 of 5, by ripsaw8080

Posted on 2010-08-27, 10:16

ripsaw8080 Offline

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Posts: 5094
Joined: 2006-04-25, 23:24

Mode 11h is 640x480 mono graphics, so dunno why that program seems to be testing it like a text mode... any text drawn in that mode must be done as pixels, AFAIK.

EDIT: loading a VGA bios does show some difference. Text output with INT 10h in mode 11h is not rendered as graphics in segment A000h as DOSBox does; but the text/attr data is written into the B800h segment (invisibly because the graphics display is active). It's kind of strange, and I tend to prefer what DOSBox is doing... 😜

Last edited by ripsaw8080 on 2010-08-27, 10:29. Edited 1 time in total.

Reply 2 of 5, by h-a-l-9000

Posted on 2010-08-27, 10:26

h-a-l-9000 Offline

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Maybe it uses Int 10/AH=08h

1+1=10

Reply 3 of 5, by wd

Posted on 2010-08-27, 10:43

wd Offline

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None of these issues is relevant.

Reply 4 of 5, by lucky7456969

Posted on 2010-08-27, 11:00

lucky7456969 Offline

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Rank: Oldbie
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Joined: 2009-09-10, 05:49

wd wrote:
None of these issues is relevant.

Why? Can you elaborate?
Would vertical interrupts deviations make the screen torn in some games?
Just a guess
Thanks
Jack

Reply 5 of 5, by h-a-l-9000

Posted on 2010-08-27, 11:42

h-a-l-9000 Offline

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Most of the ISA VGA cards I've seen had their interrupt disabled by jumper. After all it would conflict with the MPU401. So far we don't know any VGA game that needs the interrupt enabled.

1+1=10

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