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- From: hst@mh.nl (Klaas Hemstra)
- Newsgroups: comp.sys.ibm.pc.hardware
- Subject: Re: Programming VGA in extended modes
- Message-ID: <Bt7wyG.I5M@pronto.mh.nl>
- Date: 19 Aug 92 06:35:03 GMT
- References: <ABalFagSL8@speech.lang.lgu.spb.su>
- Sender: hst@pronto.mh.nl (Klaas Hemstra)
- Organization: Multihouse Automation, the Netherlands
- Lines: 16
- In-Reply-To: shura@speech.lang.lgu.spb.su's message of Tue, 18 Aug 1992 13:32:20 GMT
- X-Md4-Signature: 9f328f35ef672ad223a2a91accdd9d9a
-
-
- If you need "info" about programming SVGA modes then i suggest
- you try and get VGAKITxx from SIMTEL20. It shows clearly how
- to access the video memory of all these SVGA boards (in contains
- code for it).
-
- Short answer:
- Yes: It is different for EVERY brand of SVGA chipset.
- The memory will be accessed in 64K banks, at segment address 0xa000,
- where the Bank-switching will be different for all SVGA chipsets.
- The 16 colour mode 800x600 is mostly without bank switching.
- The 16 colour mode 1024x768 is sometimes without bank switching (but
- in that case means accessing MORE then 64K memory.
-
- If you can, use VGAKIT. Good luck,
- Klaas
-