How do I install the Dma Expert skill?

Run npx skillmds add majiayu000/dma-expert in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Dma Expert safe to use?

This skill has not completed SkillMD's automated safety review yet. Capability flags: docs only. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Dma Expert?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Dma Expert free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Dma Expert?

majiayu000 (@majiayu000) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Dma Expert by majiayu000 — Agent Skill

Name: Dma Expert
Rating: 4.666666666666667 (3 reviews)
Author: majiayu000

File contents

DMA Expert - Intel 8237A / KR580VT57

Expert knowledge for the ES-1841's DMA controller.

Key Specifications

Property	Value
Soviet Clone	KR580VT57 / KR1810VT37
Channels	4 independent
I/O Ports	`00h`-`0Fh`
Page Regs	`81h`, `82h`, `83h`, `87h`

I/O Ports

Port	Read	Write
`00h`-`07h`	Current addr/count	Base addr/count
`08h`	Status Register	Command Register
`0Ah`	-	Single Mask Register
`0Bh`	-	Mode Register
`0Ch`	-	Clear Flip-Flop
`0Dh`	Temp Register	Master Clear

Page Registers (Upper 4 Address Bits)

Port	Channel
`87h`	Ch0
`83h`	Ch1
`81h`	Ch2
`82h`	Ch3

Channel Assignments

Channel	Usage
0	DRAM Refresh
2	Floppy Disk
3	Hard Disk

Mode Register (Port `0Bh`)

Bits 7-6: Mode (00=demand, 01=single, 10=block)
Bit 5:    Decrement/Increment
Bit 4:    Auto-init
Bits 3-2: Transfer type (01=write, 10=read)
Bits 1-0: Channel select

Programming Sequence

Mask channel
Clear flip-flop
Write address LSB/MSB
Write page register
Clear flip-flop
Write count LSB/MSB (bytes - 1)
Set mode
Unmask channel

References

See references/ for detailed documentation.

---name: dma-expertdescription: Expert on Intel 8237A DMA Controller for ES-1841. Provides guidance on DMA transfers, floppy/HDD data transfer, DRAM refresh, page registers, and channel configuration.--- # DMA Expert - Intel 8237A / KR580VT57 Expert knowledge for the ES-1841's DMA controller. ## Key Specifications | Property | Value | | ------------ | -------------------------- | | Soviet Clone | KR580VT57 / KR1810VT37 | | Channels | 4 independent | | I/O Ports | `00h`-`0Fh` | | Page Regs | `81h`, `82h`, `83h`, `87h` | ## I/O Ports | Port | Read | Write | | ----------- | ------------------ | -------------------- | | `00h`-`07h` | Current addr/count | Base addr/count | | `08h` | Status Register | Command Register | | `0Ah` | - | Single Mask Register | | `0Bh` | - | Mode Register | | `0Ch` | - | Clear Flip-Flop | | `0Dh` | Temp Register | Master Clear | ## Page Registers (Upper 4 Address Bits) | Port | Channel | | ----- | ------- | | `87h` | Ch0 | | `83h` | Ch1 | | `81h` | Ch2 | | `82h` | Ch3 | ## Channel Assignments | Channel | Usage | | ------- | ------------ | | 0 | DRAM Refresh | | 2 | Floppy Disk | | 3 | Hard Disk | ## Mode Register (Port `0Bh`) ```text Bits 7-6: Mode (00=demand, 01=single, 10=block) Bit 5: Decrement/Increment Bit 4: Auto-init Bits 3-2: Transfer type (01=write, 10=read) Bits 1-0: Channel select ``` ## Programming Sequence 1. Mask channel 2. Clear flip-flop 3. Write address LSB/MSB 4. Write page register 5. Clear flip-flop 6. Write count LSB/MSB (bytes - 1) 7. Set mode 8. Unmask channel ## References See [references/](references/) for detailed documentation.

Frequently asked questions