114 lines
3.8 KiB
Markdown
114 lines
3.8 KiB
Markdown
# 2023-09-25 — Dev notes
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## TODO
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- [ ] Notes on possible architecture extensions to add support for a 16-bit IP
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- [ ] add tape drive to mainframe
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- review 8080 style io ports
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- works bc they have 2 operands per instruction, i think
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## Networking - first bits of research
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- [Bus network](https://en.m.wikipedia.org/wiki/Bus_network)
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- [Econet](https://en.m.wikipedia.org/wiki/Econet)
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- [Telnet](https://en.wikipedia.org/wiki/Telnet)
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- [Adding a serial port to my 6502 computer – Mike's Software Blog](https://mike42.me/blog/2021-07-adding-a-serial-port-to-my-6502-computer)
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- uxn networking — not helpful to me, i think
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- https://github.com/klardotsh/uxnyap
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- https://compudanzas.net/uxn_tutorial_day_7.html
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- https://hacklab.nilfm.cc/xrxs/about/
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## 6502 vectors
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https://www.masswerk.at/6502/6502_instruction_set.html
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> System Vectors
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>
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> $FFFA, $FFFB ... NMI (Non-Maskable Interrupt) vector, 16-bit (LB, HB)
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> $FFFC, $FFFD ... RES (Reset) vector, 16-bit (LB, HB)
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> $FFFE, $FFFF ... IRQ (Interrupt Request) vector, 16-bit (LB, HB)
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## Docs leftovers: alternative table format for instructions
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| lo ↓ / hi → | 0 (G0, M0) |
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|-------------|------------|
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| **0** | END |
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| **1** | NOP |
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| **2** | |
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| **4** | |
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| **7** | |
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| **8** | |
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| **9** | |
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| **A** | |
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| **F** | |
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| lo ↓ / hi → | 5 (G1, M1) | 6 (G1, M2) |
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|-------------|------------|------------|
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| **0** | LDA # | LDA ind |
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| **1** | STO # | STO ind |
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| **2** | ADD # | ADD ind |
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| **3** | SUB # | SUB ind |
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| **4** | JMP # | JMP ind |
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| **5** | JEQ # | JEQ ind |
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| **6** | JFL # | JFL ind |
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| **7** | FTG # | FTG ind |
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| | | |
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| **8** | MUL # | MUL ind |
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| **9** | DIV # | DIV ind |
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| **A** | JLT # | JLT # |
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| **B** | JGT # | JGT # |
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| **C** | NOT # | NOT # |
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| **D** | AND # | AND # |
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| **E** | OR # | OR # |
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| **F** | XOR # | XOR # |
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| lo ↓ / hi → | 9 (G2, M1) | A (G2, M2) |
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|-------------|------------|------------|
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| **0** | DEV # | DEV ind |
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| **1** | INP # | INP ind |
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| **2** | OUT # | OUT ind |
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| **3** | FED | FED |
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| **7** | | |
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| **8** | | |
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| **9** | | |
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| **F** | | |
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| lo ↓ / hi → | F (G3, M3) |
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|-------------|------------|
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| **0** | |
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| **7** | |
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| **8** | RSL A |
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| **9** | RSR A |
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| **A** | ASL A |
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| **B** | ASR A |
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| **D** | |
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| **F** | | |