[Possible Bug?] Blank CGA

Discussion of development and patch submission.
User avatar
gen_angry
Posts: 48
Joined: Sat 25 Feb, 2017 6:48 am

[Possible Bug?] Blank CGA

Postby gen_angry » Thu 26 Oct, 2017 8:58 pm

Hello, I am trying to create an AMI XT with an 8088 7.16Mhz CPU + CGA graphics. Using v12 stable release.

When I try to boot up, all text is blank (and the cursor moves like it is doing something). However, using an ET4000 (for testing) works and all text is displayed.

PCem.cfg is attached.
pcem.cfg
(1004 Bytes) Downloaded 7 times


This is what I get using a CGA (the cursor moves around rapidly)
Image

This is what I get with the ET4000
Image

Apologies if this isn't a bug, I tried searching the forum for something about this and couldn't find anything.

Thank you :)
PCem_Tester
Posts: 6
Joined: Fri 12 Dec, 2014 6:57 am

Re: [Possible Bug?] Blank CGA

Postby PCem_Tester » Thu 26 Oct, 2017 9:48 pm

You are missing the MDA video adapter font (mda.rom) hence the CGA adapter isn't working properly. This also effects the Hercules, MDA, and other CGA-based video adapters (like Plantronics ColorPlus) though it doesn't effect VGA and EGA adapters.

Try to put 'mda.rom' (or if you didn't have it, try to search online for it) in the "roms" folder and it should work again.
Last edited by PCem_Tester on Thu 26 Oct, 2017 10:19 pm, edited 1 time in total.
JohnElliott
Posts: 46
Joined: Sun 31 Jan, 2016 7:29 pm

Re: [Possible Bug?] Blank CGA

Postby JohnElliott » Thu 26 Oct, 2017 9:56 pm

One minor correction: The Wyse 700 gets its characters from wy700.rom, not mda.rom.
PCem_Tester
Posts: 6
Joined: Fri 12 Dec, 2014 6:57 am

Re: [Possible Bug?] Blank CGA

Postby PCem_Tester » Thu 26 Oct, 2017 10:18 pm

JohnElliott wrote:One minor correction: The Wyse 700 gets its characters from wy700.rom, not mda.rom.

I forgot about that actually. Thank you for the correction. Will be editing my post shortly.
User avatar
gen_angry
Posts: 48
Joined: Sat 25 Feb, 2017 6:48 am

Re: [Possible Bug?] Blank CGA

Postby gen_angry » Thu 26 Oct, 2017 11:37 pm

PCem_Tester wrote:You are missing the MDA video adapter font (mda.rom) hence the CGA adapter isn't working properly. This also effects the Hercules, MDA, and other CGA-based video adapters (like Plantronics ColorPlus) though it doesn't effect VGA and EGA adapters.

Try to put 'mda.rom' (or if you didn't have it, try to search online for it) in the "roms" folder and it should work again.


That was it, thank you. :)



Feature suggestion: If this rom is missing, have it display a note?
User avatar
dreamer
Posts: 29
Joined: Wed 28 Dec, 2016 11:56 am

Re: [Possible Bug?] Blank CGA

Postby dreamer » Mon 30 Oct, 2017 9:06 am

It would be useful to have all the rom files required for your current configuration listed in a new tab or maybe a completely new window that lists all the files that PCem looks or might look for and their status (with checksums even to make sure it's the right file).

Return to “Development”

Who is online

Users browsing this forum: No registered users and 1 guest