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Agent skill
dma-expert
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.
Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/dma-expert
SKILL.md
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.
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