Snippet:Score - Revision history

E5frog at 07:09, 14 June 2022

2022-06-14T07:09:52Z

E5frog at 06:47, 14 June 2022

2022-06-14T06:47:00Z

E5frog at 06:44, 14 June 2022

2022-06-14T06:44:08Z

E5frog at 17:52, 13 June 2022

2022-06-13T17:52:20Z

E5frog: Created page with "When coding a game you usually want to add some kind of scoring. This is an example of an eight digit scoring method using decimal add. In the example below the score is hel..."

2022-06-13T15:01:28Z

Created page with "When coding a game you usually want to add some kind of scoring. This is an example of an eight digit scoring method using decimal add. In the example below the score is hel..."

New page

When coding a game you usually want to add some kind of scoring. This is an example of an eight digit scoring method using decimal add.

In the example below the score is held in scratchpad registers from 37 down to 34 going backwards and adding up from least significant to most significant.
Score is added using the 16-bit Q and K registers, which are 32 bits in total and we store two decimal digits per byte, which means - using decimal mode, we get a score register that can hold 99'999'999 points.

<pre>
score.add:
lisu 3 ; Set scratchpad register
lisl 7

lr A, QL ; Copy least significant digit (holds 1's and 10's) to A from QL
asd S ; Decimal add scratchpad value from the set 'O'37
lr D, A ; Copy result to scratchpad and then decrease it to 'O'36
; Two digits done
lr A, QU ; Copy next score byte (100's and 1000's)from QU into A
lnk ; LNK adds carry bit from previous ASD operation
asd S ; Decimal add to scratchpad 'O'36
lr D, A ; Copy result to scratchpad and then decrease it to 'O'35
; Four digits done
lr A, KL ; Copy next byte from KL (10'000 and 100'000)
lnk ; Add carry from previous operation
asd S ; Decimal add scratchpad 'O'35
lr D, A ; Copy result to scratchpad and then decrease it to 'O'34
; Six digts done
lr A, KU ; Load next byte (1'000'000 and 10'000'000)
lnk ; Add carry from previous operation
asd S ; Decimal add scratchpad
lr D, A ; Store result
; 8 digits ALL done
</pre>

← Older revision		Revision as of 07:09, 14 June 2022
Line 1:		Line 1:
−	When coding a game you usually want to add some kind of scoring. This is an example of an eight digit scoring method using decimal add. Decimal add is done using [[Binary coded decimal]] ~~or BCD, if adding two decimal numbers~~ (BCD ~~encoded~~) ~~you'll simply use it directly~~. If adding a hexadecimal number you first need to add $66 before using the ASD op-code ~~to convert it to BCD~~.	+	When coding a game you usually want to add some kind of scoring. This is an example of an eight digit scoring method using decimal add. Decimal add is done using [[Binary coded decimal]] (BCD). If adding a hexadecimal number you first need to add $66 before using the ASD op-code.

	In the example below the BCD score is held in scratchpad registers from 37 down to 34 going backwards and adding up from least significant to most significant. Score is added using the 16-bit Q and K registers, which are 32 bits in total and we store two decimal digits per byte, which means - using decimal mode, we get a score register that can hold 99'999'999 points.		In the example below the BCD score is held in scratchpad registers from 37 down to 34 going backwards and adding up from least significant to most significant. Score is added using the 16-bit Q and K registers, which are 32 bits in total and we store two decimal digits per byte, which means - using decimal mode, we get a score register that can hold 99'999'999 points.

@@ Line 1: / Line 1: @@
-When coding a game you usually want to add some kind of scoring. This is an example of an eight digit scoring method using decimal add. Decimal add is done using [[Binary coded decimal]], which basically means you add 6 to the decimal number and use the interval 0x06-0x0F to represent 0-9.
+When coding a game you usually want to add some kind of scoring. This is an example of an eight digit scoring method using decimal add. Decimal add is done using [[Binary coded decimal]] or BCD, if adding two decimal numbers (BCD encoded) you'll simply use it directly. If adding a hexadecimal number you first need to add $66 before using the ASD op-code to convert it to BCD.
-In the example below the score is held in scratchpad registers from 37 down to 34 going backwards and adding up from least significant to most significant. Score is added using the 16-bit Q and K registers, which are 32 bits in total and we store two decimal digits per byte, which means - using decimal mode, we get a score register that can hold 99'999'999 points.
+In the example below the BCD score is held in scratchpad registers from 37 down to 34 going backwards and adding up from least significant to most significant. Score is added using the 16-bit Q and K registers, which are 32 bits in total and we store two decimal digits per byte, which means - using decimal mode, we get a score register that can hold 99'999'999 points.
@@ Line 28: / Line 28: @@
 	lr	D, A		; Store result
 				; 8 digits ALL done
 </pre>

← Older revision		Revision as of 17:52, 13 June 2022
Line 1:		Line 1:
−	When coding a game you usually want to add some kind of scoring. This is an example of an eight digit scoring method using decimal add.	+	When coding a game you usually want to add some kind of scoring. This is an example of an eight digit scoring method using decimal add. Decimal add is done using [[Binary coded decimal]], which basically means you add 6 to the decimal number and use the interval 0x06-0x0F to represent 0-9.

−	In the example below the score is held in scratchpad registers from 37 down to 34 going backwards and adding up from least significant to most significant.	+	In the example below the score is held in scratchpad registers from 37 down to 34 going backwards and adding up from least significant to most significant. Score is added using the 16-bit Q and K registers, which are 32 bits in total and we store two decimal digits per byte, which means - using decimal mode, we get a score register that can hold 99'999'999 points.
−	Score is added using the 16-bit Q and K registers, which are 32 bits in total and we store two decimal digits per byte, which means - using decimal mode, we get a score register that can hold 99'999'999 points.

@@ Line 5: / Line 5: @@
 <pre>
-score.add:
+Score:
 	lisu	3		; Set scratchpad register
 	lisl	7