Originally typed by Fireflash and Sponge of Combat 18 (24.08.93) Amigaguided and Page 19 added by Schwartzenegger of TFA (29.09.93) Finalised (more links, endnode bug sorted) by Kyzer/CSG (22.05.96) More finalised (changed to HTML and put on the net) by Solo/Genetic (01-11-96) History HTML version: 1.0 (1-nov-1996) - straight port from amiga guide 2 HTML. 1.1 (2-nov-1996) - fixed a lot of links. - put in 3 files i.s.o. 1 for faster access. and the aga.html file was 2 long for netscape (160 kb) dono why.. 1.1b (3-Nov-1996) - created some tables. Todo: - still have to fix some links. - make some cool tables ipv. the ascii 1's.
BPLCON1 now contains an 8 bit scroll value for each of the playfields. Granularity of scroll now extends down to 35nSec.(1 SHRES pixel), and scroll can delay playfield thru 32 bus cycles. Bits BPAGEM and BPL32 in new register FMODE control size of bitplane data in BPLxDAT thru BPLxDAT.
The old 6 bitplane HAM mode, unlike before, works in HIRES and SHRES resolutions.
As before bitplanes 5 and 6 control it`s function as follows:
| BP6 | BP5 | RED | GREEN | BLUE |
|---|---|---|---|---|
| 0 | 0 | select new base reg.(1-16) | ||
| 0 | 1 | hold | hold | modify |
| 1 | 0 | modify | hold | hold |
| 1 | 1 | hold | modify | hold |
There is a new 8 bitplane HAM (Hold and Modify) mode. This mode is invoked when BPU field in BPLCON0 is set to 8 , and HAMEN is set. Bitplanes 1 and 2 are used as control bits analagous to the function of bitplanes 5 and 6 in 6 bitplane HAM mode:
| BP2 | BP1 | RED | GREEN | BLUE |
| 0 | 1 | select new base reg.(1-64) | ||
| 0 | 1 | hold | hold | modify |
| 1 | 0 | modify | hold | hold |
| 1 | 1 | hold | modify | hold |
Since only 6 bitplanes are available for modify data, the data is placed in 6 MSB. The 2 LSB are left unmodified, which allows creation of all 16,777,216 colours simultaneously, assuming one had a large enough screen and picked one`s base registers judiciously. This HAM mode also works in HIRES and SHRES modes.
For compatibility reasons EHB mode remains intact. Its existence is rather moot in that we have more than enough colours in the colour table to replace its functionality. As before, EHB is invoked whenever SHRES = HIRES = HAMEN= DPF = 0 and BPU = 6. Please note that starting with ECS DENISE there is a bit in BPLCON2 which disables this mode (KILLEHB).
Bits PF2OF2,1,0 in BPLCON3 determine second playfield`s offset into the colour table. This is now necessary since playfields in DPF mode can have up to 4 bitplanes. Offset value are as defined in register map.
BSCAN2 bit in FMODE enables bitplane scan-doubling. When V0 bit of DIWSTRT matches V0 of vertical beam counter, BPL1MOD contains the modulus for the display line, else BPL2MOD is used. When scan-doubled both odd and even bitplanes use the same modulus on a given line, whereas in normal mode odd bitplanes used BPL1MOD and even bitplanes used BPL2MOD. As a result Dual Playfields screens will probably not display correctly when scan-doubled.
SPRITES
Bits SPAGEM and SPR32 in FMODE whether size of sprite load datain SPRxDAT thru SPRxDAT is 16,32, or 64 bits, analagous to bitplanes. BPLCON3 contains several bits relating to sprite behavior. SPRES1 and SPRES0 control sprite resolution, whether they conform to theECS standard or override tp LORES,HIRES,or SHRES. BRDRSPRT, when high,allows sprites to be visible in border areas. ESPRM7 thru ESPRM4 allow relocation of the even sprite colour map. OSPRM7 thru OSPRN4 allow relocation of the odd sprite colour map. In the case of attached sprites OSPRM bits are used.
SSCAN2 bit in FMODE enables sprite scan-doubling. When enabled, individual SH10 bits in SPRxPOS registers control whether or not a given sprite is to be scan-doubled. When V0 bit of SPRxPOS register matches V0 bit of vertical beam counter, the given sprite`s DMA is allowed to proceed as before. If the don`t match, then sprite DMA is disabled and LISA reuses the sprite data from the previous line. When sprites are scan-doubled, only the position and control registers need be modified by the programmer; the data registers need no modification.
NOTE: Sprite vertical start and stop positions must be of the same parity, i.e. both odd or even.
COMPATIBILITY
RST_pin resets all bits in all registers new to AA. These registers include: BPLCON3, BPLCON4, CLXCON2, DIWHIGH, FMODE. ECSENA bit (formerly ENBPLCN3) is used to disable those register bits in BPLCON3 that are never accessed by old copper lists, and in addition are required by old style copper lists to be in their default settings.Specifically ECSENA forces the following bits to their default low settings: BRDRBLNK, BRDNTRAN, ZDCLKEN, EXTBLKEN, and BRDRSPRT.
CLXCON2 is reset by a write to CLXCON, so that old game programs will be able to correctly detect collisions.
DIWHIGH is reset by writes to DIWSTRT or DIWSTRT. This is interlock is inhertied from ECS Denise.
GENLOCK
Lots of new genlock features were added to ECS DENISE and arecarried over to LISA. ZDBPEN in BPLCON2 allows any bitplane, selected by ZDBPSEL2,1,0,to be used as a transparency mask (ZD pin mirrors contents of selected bitplane). ZDCTEN disables the old COLORx is transparent mode, and allows the bit31 position of each colour in the colour table to control transparency.ZDCLKEN generates a 14MHz clock synchronized with the video data that can be used by video post-processors. Finally, BRDNTRAN in BPLCON3 generates an opaque border region which can be used to frame live video.
COLOUR LOOKUP TABLE
The colour table has grown from 32 13-bit registers to 256 25-bit registers. Several new register bits have been added to BPLCON3 to facilitate loading the table with only 32 register addresses. LOCT, selects either the 16 MSB or LSB for loading. Loading the MSB always loads the LSB as well for compatibility, so when 24 bit colours are desired load LSB after MSB. BANK2,1,0 of 8 32 address banks for loading as follows:
| BANK2 | BANK1 | BANK0 | Color address range |
| 0 | 0 | 0 | COLOR00 - COLOR1F |
| 0 | 0 | 1 | COLOR20 - COLOR3F |
| 0 | 1 | 0 | COLOR40 - COLOR5F |
| 0 | 1 | 1 | COLOR60 - COLOR7F |
| 1 | 0 | 0 | COLOR80 - COLOR9F |
| 1 | 0 | 1 | COLORA0 - COLORBF |
| 1 | 1 | 0 | COLORC0 - COLORDF |
| 1 | 1 | 1 | COLORE0 - COLORFF |
COLLISION
A new register CLXCON2 contains 4 new bits. ENBP7 and ENBP6 are the enable bits for bitplanes 7 and 8, respectively. Similarly, MVBP7 and MPBP8 are their match value bits. CLXDAT is unchanged.
HORIZONTAL COMPARATORS
All programmable comparators with the exception of VHPOSW have 35nSec resolution.: DIWHIGH, HBSTOP, SPRCTL, BPLCON1. BPLCON1 has additional high-order bits as well. Note that horizontal bit position representing 140nSec resolution has been changed to 3rd least significant bit,where before it used to be a field`s LSB, For example, bit 00 in BPLCON1 used to be named PF1H0 and now it`s called PF1H2.
COERCION OF 15KHZ TO 31KHZ
We have added new hardware features to LISA to aid in properly displaying
15KHz and 31KHz viewports together on the same 31KHz display. LISA can
globally set sprite resolution to LORES, HIRES, or SHRES.
LISA will ignore SH10 compare bits in SPRxPOS when scan-doubling, thereby
allowing ALICE to use these bits individually set scan-doubling.
Index.
We now have a palette of 2~24 colours.
LORES (320x200)
----------------
6 Bitplane (non HAM, non EHB) 64 colours !
7 Bitplane 128 colours !
8 Bitplane 256 colours !
8 Bitplane HAM Any 2^24 colours !
Dual playfield, Max 4 bitplane per playfield. 16 colours !
per playfield. The bank of 16 colours in the 256 colour palette
is selectable per playfield.
HIRES (640x200)
----------------
5 Bitplanes 32 colours @
6 Bitplanes 64 colours @
7 Bitplanes 128 colours @
8 Bitplanes 256 colours @
6 Bitplanes EHB 32 * 2 colours @
6 Bitplanes HAM 4096 colours @
8 Bitplanes HAM any of 2^24 colours @
Dual playfield, max 4 bitplane per playfield 16 colours per ! or @
playfield. The bank of 16 colours in the 256 colour palette
is selectable per playfield.
SUPERHIRES (1280X200)
---------------------
1 or 2 bitplanes, as ECS, but no color fudging !
3 Bitplanes 8 colours @
4 Bitplanes 16 colours @
5 Bitplanes 32 colours $
6 Bitplanes 64 colours $
7 Bitplanes 128 colours $
8 Bitplanes 256 colours $
6 Bitplanes EHB 32 * 2 colours $
6 Bitplanes HAM 4O96 colours $
8 Bitplanes HAM any of 2~24 colours $
Dual Playfield, max 4 bitplanes per playfield @ or $
16 colours per playfield. The bank of 16 of colours
in the 256 colours palette is selectable per playfield.
VGA (640X480 non-interlaced)
-----------------------------
1 or 2 bitplanes, as ECS, but no colour fudging !
3 Bitplanes 8 colours @
4 Bitplanes 16 colours @
5 Bitplanes 32 colours $
6 Bitplanes 64 colours $
7 Bitplanes 128 colours $
8 Bitplanes 256 colours $
6 Bitplanes EHB 32 * 2 colours $
6 Bitplanes HAM 4O96 colours $
8 Bitplanes HAM any of 2~24 colours $
Dual playfield,Max 4 bitplanes per playfield @ or $
16 colours per playfield . The bank of 16 colours
in the 256 colour palette is selectable per playfield
Super 72 (848x614 interlaced, 70 Hz frame rate)
-----------------------------------------------
1 or 2 bitplanes, as ECS, but no colour fudging 1X
3 Bitplanes 8 colours 2X
4 Bitplanes 16 colours 2X
5 Bitplanes 32 colours 4X
6 Bitplanes 64 colours 4X
7 Bitplanes 128 colours 4X
8 Bitplanes 256 colours 4X
6 Bitplanes EHB 32 * 2 colours 4X
6 Bitplanes HAM 4O96 colours 4X
8 Bitplanes HAM any of 2~24 colours 4X
Dual playfield,Max 4 bitplanes per playfield 2X or 4X
16 colours per playfield . The bank of 16 colours
in the 256 colour palette is selectable per playfield
All playfield scrolling is now in 35ns increments.
Pre AA scrolling was in 140ns increments.
Scroll Range as Programmed in BPLCON1
-----------------------------------
1x Mode LOWRES Pixels SHRES Pixels
LOWRES 0-15 0-63 HIRES 0-7 0-31 SHRES 0-3 0-15
2x Mode LOWRES Pixels SHRES Pixels
LOWRES 0-31 0-127 HIRES 0-15 0-63 SHRES 0-7 0-31
4x Mode LOWRES Pixels SHRES Pixels
LOWRES 0-63 0-255 HIRES 0-31 0-127 SHRES 0-15 0-63
Sprites
-------
All sprites can now be displayed in either:
- ECS default mode
- 140 ns (this is not ECS mode!)
- 70 ns
- 35 ns
on display resolution. eg 35 ns sprites on a lores screen, or 140 ns
sprites on a superhires screen.
Sprites are either 16, 32, or 64 bits wide.
Sprites can be attatched in any mode (formerly could not attach sprites
in the ECS SHRES 35ns resolution mode).
Can use any bank of 16 colours from the 256 colour palette for the sprite
colours.
Key:
! needs 1x Bandwidth (old modes)
@ needs 2x Bandwidth (normal CAS 32bit bus with or double CAS 16 bit bus width)
$ needs 4x Bandwidth (double CAS 32bit bus width)
Index.