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Programmable Flash Memory Expansion - Revision history
2024-03-29T09:27:46Z
Revision history for this page on the wiki
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http://www.ninerpedia.org/index.php?title=Programmable_Flash_Memory_Expansion&diff=50527&oldid=prev
Mizapf: Mizapf moved page Programmble Flash Memory Expansion to Programmable Flash Memory Expansion: Typo
2021-01-27T13:14:57Z
<p>Mizapf moved page <a href="/wiki/Programmble_Flash_Memory_Expansion" class="mw-redirect" title="Programmble Flash Memory Expansion">Programmble Flash Memory Expansion</a> to <a href="/wiki/Programmable_Flash_Memory_Expansion" title="Programmable Flash Memory Expansion">Programmable Flash Memory Expansion</a>: Typo</p>
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<td colspan="1" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="1" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 13:14, 27 January 2021</td>
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Mizapf
http://www.ninerpedia.org/index.php?title=Programmable_Flash_Memory_Expansion&diff=49574&oldid=prev
Mizapf: Created page with "The PFM512 boot device modification replaces the standard 16KiB 28-pin boot EPROM with a 512KiB 32-pin Atmel 29c040 flash chip. The chip is visible in four 128KiB banks residing..."
2015-08-21T13:44:32Z
<p>Created page with "The PFM512 boot device modification replaces the standard 16KiB 28-pin boot EPROM with a 512KiB 32-pin Atmel 29c040 flash chip. The chip is visible in four 128KiB banks residing..."</p>
<p><b>New page</b></p><div>The PFM512 boot device modification replaces the standard 16KiB 28-pin boot EPROM with a 512KiB 32-pin Atmel 29c040 flash chip. The chip is visible in four 128KiB banks residing at memory pages 0xF0 - 0xFF. Each page is selected via two re-purposed (normally unused) TMS9901 outputs:<br />
<br />
{| style="width:70%; margin-top:3ex"<br />
|-<br />
| colspan="4" style="background-color:lightgray; text-align:center" | PFM512 Bank Selection<br />
|-<br />
| style="width:15%; font-weight:bold" | CRU 0x28<br />
| style="width:15%; font-weight:bold" | CRU 0x3A<br />
| style="width:15%; font-weight:bold" | Bank<br />
| style="font-weight:bold" | Notes<br />
|-<br />
| 0<br />
| 0<br />
| Bank 0 Default<br />
| Boot code and Operating System<br />
|-<br />
| 0 <br />
| 1 <br />
| Bank 2<br />
| Flashdisk bank #1<br />
|-<br />
| 1<br />
| 0<br />
| Bank 1 <br />
| Flashdisk bank #2<br />
|-<br />
| 1<br />
| 1<br />
| Bank 3<br />
| Flashdisk bank #3<br />
|}</div>
Mizapf