Mercurial > hg > Members > kono > nitros9-code
view defs/vdgdefs @ 2817:5c6b71612ce4 lwtools-port
Added low level CoCo SDC driver and made makefile changes for coco3 and coco3_6309 to build boot disks for this new driver.
Fixed up shellplus labels.
author | Boisy Pitre <boisy.pitre@nuance.com> |
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date | Wed, 01 May 2013 08:38:04 -0500 |
parents | e396d4f24b27 |
children |
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IFNE VDGDEFS-1 VDGDEFS SET 1 ******************************************************************** * VDGDefs - VDG Interface Definititions * * $Id$ * * Edt/Rev YYYY/MM/DD Modified by * Comment * ------------------------------------------------------------------ * 1991/05/07 Alan DeKok * Wrote original from VDGInt source. NAM VDGDefs TTL VDG Interface Definitions * Notes: * * All offsets from 'U' (address of device memory area) * (see p. 6-9, technical reference: U=start of driver data memory * NOTE: There is LOTS of stuff which is only used once, and some which * is not needed. Here's a list of the un-needed, and un-used (other than * once) * * It would probably be benificial to patch VDGint to fix these problems, * unless anyone else has ideas as to why VDGint is doing things this way. * * Un-needed * VD.EPlt1 - (2) set to VD.NChar, and then read only * VD.EPlt2 - (2) set to same as VD.EPlt1, and then unused * VD.Chr1 - (1) set to same as VD.CChar, and then unused * VD.PlFlg - (1) initialized to $08, and unused * * Un-used * * $1D - (1) end of SCF memory requirements * VD.Strt1 - (2) CLRed, and then read (LDD) - left as $0000 * $24-$2B - (8) * $33-$34 - (2) * $7E-$FF - (130) * * Total of 22 (150 in whole page) bytes unneeded or unused. ORG $1E VD.Start RMB 1 start of VD.XXXX data: number of VDG screens in use VD.Strt1 RMB 2 (2) and another start VD.Caps RMB 2 caps lock info: $00=lower $FF=upper VD.DFlag RMB 1 0=current screen is valid, $01-$FF = update video * $24-$2B unused RMB 8 VD.NGChr RMB 1 number of additional characters to get VD.RTAdd RMB 2 (2) return address after getting characters VD.EPlt1 RMB 2 (2) pointer to where to put next character VD.EPlt2 RMB 2 (2) as above. * $33-$34 unused RMB 2 VD.CFlag RMB 1 true lowercase flag $10=true, $00=false VD.CFlg1 RMB 1 VDG display code values VD.DGBuf RMB 1 number of currently displayed buffer VD.ScrnA RMB 2 (2) screen start address in system memory VD.ScrnE RMB 2 (2) address of end of screen VD.CrsrA RMB 1 (2) cursor address VD.CrsAL RMB 1 cursor address low VD.CChar RMB 1 value of character under cursor VD.Mode RMB 1 mode: 0=256x192 x2, 1=128x192 x4 VD.Chr1 RMB 1 same as under cursor character VD.CColr RMB 1 cursor color VD.Col RMB 1 number of columns for this screen VD.Row RMB 1 number of rows VD.TFlg1 RMB 1 see WRITE ($0E) VD.Alpha RMB 1 0 when in alpha mode VD.Rdy RMB 1 device ready (see SS.DStat 0=not ready) VD.SBAdd RMB 2 (2) address of block screen is in VD.Blk RMB 1 Block number of screen VD.GBuff RMB 1 allocation for graphics buffers (block#) VD.AGBuf RMB 2 (2) additional graphics buffer VD.HiRes RMB 1 hi-res screen table (block value) VD.NBlk RMB 1 number of blocks in this screen VD.SType RMB 1 screen type 0-4 VD.HR2 RMB 3 (3) for screen number 2 VD.HR3 RMB 3 (3) for screen 3 (same 3 bytes as above) VD.FFMem RMB 2 (2) bottom of stack for flood fill VD.FFSPt RMB 2 (2) flood fill stack pointer VD.FFSTp RMB 2 (2) flood fill stack top pointer VD.FF6 RMB 1 flood fill flag VD.MTabl RMB 2 (2) address of mask table for pixels in byte VD.PixBt RMB 1 bit mask for modes (0=$07, 1=$03 )#pixels/byte VD.GCrsX RMB 1 graphics cursor X value VD.GCrsY RMB 1 graphics cursor Y VD.Msk1 RMB 1 mask byte 1 VD.Msk2 RMB 1 mask byte 2 (00,55,AA,FF) VD.MCol RMB 1 color? (C003,8001) VD.MCol2 RMB 1 color VD.PMask RMB 1 pixel mask for colors (i.e. $55, $CC etc) VD.FF1 RMB 1 data for flood fill VD.FF2 RMB 1 data for flood fill VD.FFMsk RMB 1 flood fill mask VD.FFFlg RMB 1 flood fill flag VD.Palet RMB 16 (16) current palette values VD.PlFlg RMB 1 initialized to $08 by L00DB, and then unused! VD.NChar RMB 1 character to process VD.NChr2 RMB 1 and the next one * and RMB until we get 256 bytes reserved ENDC