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--- sd:sd-8516_programmer_s_reference_guide [2026/03/30 11:24] – appledog
+++ sd:sd-8516_programmer_s_reference_guide [2026/03/30 12:07] (current) – appledog
@@ Line 18: / Line 18: @@
 === Key Specifications
 * 16-bit architecture with 16 general-purpose registers
-* 32-bit and 64-bit register pairing system
+* 24-bit addressing with register pairing system
-* Clock speed: **125 MIPS** on a Geekbench 6 baseline system
 * Memory: 256KB addressable via 4-bank system
 * ~40× performance improvement over legacy 8510 design
@@ Line 25: / Line 24: @@
 === Default Performance:
 * Standard clock speed: 4MHz (1.28 MIPS)
-* Overclocked: max speed ~400 MHz (100+ MIPS)
+* Overclocked: 10 MHz (3 MIPS)
-* Memory bandwidth: ~540 MB/s
+* Memory bandwidth: 16 MB/s
 * Sound system overhead: < 5% CPU time
 * Video refresh: 60 Hz (16.67ms frame time)
@@ Line 334: / Line 333: @@
 == Appendix 4. Instruction Set Architecture
 * Moved to: [[Appendix 4 Instruction Set Architecture]]
-FIXME
-more to come!
-**Examples:**
-<codify armasm>
-; ld/st example
-    LDA #$1234       ; Load immediate $1234 into A
-    LDAL #$42        ; Load immediate byte $42 into AL
-    LDA  [$F000]     ; Load word from address $F000
-    STA [2:$1000]    ; Store A to bank 2, offset $1000
-</codify>
-=== Arithmetic Operations
-|= Instruction |= Description |= Flags Affected |
-| ADD | Add | Z, N, C, V |
-| SUB | Subtract | Z, N, C, V |
-| MUL | Multiply (result in AB) | Z, N |
-| DIV | Divide (quotient in A, remainder in B) | Z, N |
-| MOD | Modulo | Z, N |
-| INC | Increment | Z, N |
-| DEC | Decrement | Z, N |
-=== Logic Operations
-|= Instruction |= Description |= Flags Affected |
-| AND | Bitwise AND | Z, N |
-| OR | Bitwise OR | Z, N |
-| XOR | Bitwise XOR | Z, N |
-| NOT | Bitwise NOT | Z, N |
-| TEST | Bitwise AND (no write) | Z, N |
-=== Shift/Rotate Operations
-|= Instruction |= Description |= Flags Affected |
-| SHL | Shift left | Z, N, C |
-| SHR | Shift right | Z, N, C |
-| ROL | Rotate left | Z, N, C |
-| ROR | Rotate right | Z, N, C |
-=== Comparison & Branching
-|= Instruction |= Description |= Flags Affected |
-| CMP | Compare (subtract, discard result) | Z, N, C, V |
-| JMP | Unconditional jump | None |
-| JZ | Jump if zero | None |
-| JNZ | Jump if not zero | None |
-| JC | Jump if carry set | None |
-| JNC | Jump if carry clear | None |
-=== Subroutine Operations
-|= Instruction |= Description |
-| CALL | Call subroutine (push IP, jump) |
-| RET | Return from subroutine (pop IP) |
-| PUSH | Push register to stack |
-| POP | Pop from stack to register |
-| PUSHA | Push all registers |
-| POPA | Pop all registers |
-| INT | Software interrupt |
-=== Flag Operations
-|= Instruction |= Description |
-| SSI | Enable Sound System Interrupts |
-| CSI | Clear Sound System Interrupts |
-| SEC | Set carry flag |
-| CLC | Clear carry flag |
-| SEZ | Set zero flag |
-| CLZ | Clear zero flag |
-| SEN | Set negative flag |
-| CLN | Clear negative flag |
-| SEV | Set overflow flag |
-| CLV | Clear overflow flag |
-=== Other
-|= Instruction |= Description |
-| TSX | Transfer SP to register* |
-| TXS | Transfer register to SP* |
-* (*) these opcodes were suggested by stackminer from the Fantasy Console 2.0 discord. Thank you, stackminer!
-=== System Operations
-|= Instruction |= Description |
-| CART | Cartridge trigger, used for Cartridge BASIC and others. |
-| YIELD | Poll UI, System Clock, Sound Chip, Video Chip, and others |
-| NOP | No operation |
-| HALT | Halt CPU (set H flag) |
 == Appendix 5. Sound System (SD-450)