Known memory locations, etc.

Philip A. Prindeville philipp_subx at redfish-solutions.com
Wed Jun 16 14:32:33 PDT 2010


On 06/15/2010 11:21 AM, Al Kossow wrote:
> On 6/14/10 1:18 PM, Al Kossow wrote:
>   
>> On 6/14/10 11:29 AM, Philip Prindeville wrote:
>>     
>>> Anyone have a list of well-known memory locations?
>>>       
>>     
> If you have the BCPL development disk, you should have this already.
>   

Alas, I don't.  Where can I get a copy?


>
> // AltoDefs.d - Definitions of places and things peculiar to Altos
> // Last modified January 22, 1979  12:28 AM by Boggs
>
> manifest
> [
> // page 1
> displayListHead = 420b
> displayInterrupt = 421b
> mouseX = 424b
> mouseY = 425b
> cursorX = 426b
> cursorY = 427b
> realTimeClock = 430b
> cursorBitMap = 431b	// through 450b
> wakeupsWaiting = 452b
> activeInterrupts = 453b
> maskTable = 460b
> interruptPC = 500b
> interruptVector = 501b	// through 520b
> diskCommand = 521b
> diskStatus = 522b
> diskAddress = 523b
> trapPC = 527b
> trapVector = 530b	// through 567b
> timeParams = 570b	// through 577b
>
> // page 376
> utilOut = 177016b
> XBus = 177020b		// through 177023b (Alto II only)
> MEAR = 177024b		// Memory Error Address Register (Alto II only)
> MESR = 177025b		// Memory Error Status Register (Alto II only)
> MECR = 177026b		// Memory Error Control Register (Alto II only)
> utilIn = 177030b	// through 177033b
> kbdAd = 177034b		// through 177037b
>
> // page 377
> EIAOut = 177700b
> EIAIn = 177701b
> bankRegs = 177740b	// through 177757 (Alto II only)
> ]
>
> //----------------------------------------------------------------------------
> structure UtilIn:	// format of UtilIn word (177030b)
> //----------------------------------------------------------------------------
> [
> blank bit 6
> memConfig bit		// 0 = normal; 1 = alternate
> blank bit
> keyset bit 5 =		// 0 = depressed
>     [
>     ks0 bit		// left most
>     ks1 bit
>     ks2 bit
>     ks3 bit
>     ks4 bit		// right most
>     ]
> mouse bit 3 =		// 0 = depressed
>     [
>     red bit		// top or left button
>     blue bit		// bottom or right button
>     yellow bit		// middle button
>     ]
> ]
> 
> //----------------------------------------------------------------------------
> structure LTP:		// Local Time Parameters
> //----------------------------------------------------------------------------
> [
> sign bit 1		// Zero if west of Greenwich, one if east
> zoneH bit 4		// Local time zone in hours from Greenwich
> blank bit 2
> beginDST bit 9		// Day of year on or before which DST starts
> blank bit 1
> zoneM bit 6		// Additional minutes of local time zone
> endDST bit 9		// Day of year on or before which DST ends
> ]
>
> //----------------------------------------------------------------------------
> structure VERS:		// format of value returned by VERS instruction
> //----------------------------------------------------------------------------
> [
> eng bit 4		// 0 or 1 => Alto I; 2 => Alto II; 3 => Alto II XM
> build bit 4
> microcode bit 8
> ]
>
> //----------------------------------------------------------------------------
> structure BBT:		// BitBlt Table
> //----------------------------------------------------------------------------
> [
> function word =
>     [
>     blank bit 10		// must be zero
>     sBank bit		// source is in alternate bank
>     dBank bit		// destination is in alternate bank
>     sType bit 2		// source type
>     op bit 2		// operation
>     ]
> blank word		// unused (software stashes AC2 here)
> dbca word		// destination bitmap core address
> dbmr word		// destination bitmap raster
> dlx word		// destination left X coordinate
> dty word		// destination top Y coordinate
> dw word			// destination block width
> dh word			// destination block height
> sbca word		// source bitmap core address
> sbmr word		// source bitmap raster
> slx word		// source left X
> sty word		// source top y
> gray^0,3 word		// gray block
> ]
> manifest lBBT = size BBT/16
>
> //----------------------------------------------------------------------------
> structure DCB:		// Display Control Block
> //----------------------------------------------------------------------------
> [
> next word		// -> next DCB; 0 if last
> parwd word =
>     [
>     resolution bit 1	// 0 = high; 1 = low
>     background bit 1	// 0 = white; 1 = black
>     indwidth bit 14 =
>        [
>        indentation bit 6	// indent 16*indentation bits on the left
>        width bit 8	// in words; must be even; zero is OK
>        ]
>     ]
> bitmap word		// -> bit map; must be even
> height word		// scan lines = 2*height (height in each field)
> ]
> manifest lDCB = size DCB/16
>
>
> _______________________________________________
> Altogether-devel mailing list
> Altogether-devel at lists.brouhaha.com
> http://lists.brouhaha.com/mailman/listinfo/altogether-devel
>   




More information about the Altogether-devel mailing list