Differenze

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--- sanco8001 [2022/10/08 23:39] – giomba
+++ sanco8001 [2023/02/23 22:43] – [I/O] Added some other peripheral deduced from the code giuliof
@@ Linea 1: / Linea 1: @@
 ====== Sanco 8003 ======
-Sanco 8003 (code name CEDA, given by... us) is a Z80 based personal computer from year 1982, presumably a rebrand of [[https://www.old-computers.com/museum/computer.asp?st=1&c=1069|Sanco 8001]].
+[[https://www.old-computers.com/museum/computer.asp?st=1&c=1069|Sanco 8003]] is a Z80 based personal computer, from year 1982.
 We got one in working conditions, but we have no operating system disk, no keyboard, and we known nothing about this computer: it just turns on and shows ''V1.01'' on its CRT display.
 {{:ceda:ceda.jpg?200|}}
+This is the home page of our project of history documentation on this computer.
+We gave it the codename CEDA, as our device came with a shiny proud sticker saying "CEDA", which probably just stands for //Centro Elaborazione Dati// (Datacenter, in Italian).
 This page contains some (hopefully) useful information about this computer, that we inferred by reverse engineering it with a tester, an oscilloscope, some datasheets and some luck.
@@ Linea 26: / Linea 30: @@
 External connectors:
   * standard C13/C14 power connector
-  * 5pin DIN for keyboard
+  * 8pin DIN for keyboard
   * DB25 communication port (supposedly a serial port)
   * DB25 printer port (supposedly a standard parallel port)
-  * 8pin DIN PRNT port
+  * 5pin DIN PRNT port
 ===== Power supply =====
-  * black -> reference GND
+  * **Original** PSU
-  * red -> 12V
+    * black -> GND
-  * yellow -> 5V
+    * red -> 12V
-  * purple -> -12V
+    * yellow -> 5V
+    * purple -> -12V
-A common ATX PSU can be used to power the Sanco, just swap yellow and red wires.
+On the power connector on the motherboard there is a key between position 7 and 8, to avoid inserting the plug backwards.
+    * 1 -> GND
+    * 2 -> GND
+    * 3 -> 5V
+    * 4 -> 5V
+    * 5 -> -12V
+    * 6 -> +12 V
+    * 7 -> NC
+    * EMPTY
+    * 8 -> NC
+| {{ :ceda:psu-connector.jpeg?direct&200|}}\\ <html><div style="max-width: 200px;">A modern ATX PSU can be used to power the Sanco, just swap yellow and red wires, as shown in the picture.</div></html> |
 ===== Motherboard =====
@@ Linea 52: / Linea 69: @@
   * Motherboard and daughterboard ICs and their locations: {{ :ceda:sanco-mobo.pdf |PDF}}
-  * Display port connector (INCRT) pinout: {{ :ceda:incrt-pinout.pdf |PDF}}
+==== Connectors ====
+{{ :ceda:incrt.png?direct&200|}}
+  * Display port connector (INCRT) pinout: {{ :ceda:incrt.pdf |PDF}}
+    * 1 -> NC
+    * 2 -> GND (black)
+    * 3 -> NC
+    * 4 -> BEAM Pixels (brown)
+    * 5 -> NC
+    * 6 -> NC
+    * 7 -> Vertical Sync (violet)
+    * 8 -> Horizontal Sync (gray)
+    * 9 -> NC
+    * 10 -> GND (black)
+    * 11 -> CONTRAST (green)
+    * 12 -> CONTRAST (blue)
 ==== Schematics ====
@@ Linea 61: / Linea 93: @@
 As we found on our working computer.
-| Location | Type | Name | Description | Default value |
+^ Location ^ Type ^ Name ^ Description ^ Default value ^
 | A12 | DIP switch |  |  | 0x8F (bit 12345678) |
 | B15 | jumper | KB SEL | | shorted on PCB |
@@ Linea 68: / Linea 100: @@
 ====== ROM ======
-| Name | Version | Type | Position | Size | MD5 hash | Binary |
+^ Name ^ Version ^ Type ^ Position ^ Size ^ MD5 hash ^ Binary ^
 | Software ROM | V1.01 | 2764 | H4-H5-H6 | 8kBytes | f33347faf867be9eea28d928c7341f0e | {{ :ceda:v1.01_rom.bin |.bin dump}} |
 | Character ROM | CGV7.2 | 2732 | H12-H13-H14 | 4kBytes | 0bf03ecb77e3c6d220a354fe2c95fccd | {{ :ceda:cgv7.2_rom.bin |.bin dump}} |
@@ Linea 75: / Linea 107: @@
 ====== Memory map ======
 ===== Memory space =====
-| base | size | description |
+^ base ^ size ^ description ^
 | 0x0000 | 0x2000 | Software ROM |
 | 0x2000 |  |  |
 | 0xC000 | 0x2000 | Software ROM |
+| 0xD000 | 0x800  | Video Frame Buffer |
+| 0xD800 |  |  |
 ===== I/O =====
-| address | size | device |
+^ address ^ size ^ device ^
 | 0x81 |   | Bank switching? |
+| 0x82 |   | |
 | 0x83 |   | |
 | 0xA0 | 2 | CRTC internal registers |
 | 0xB0 | 4 | SIO/2 Serial Peripheral |
-| 0xC0 |   | |
+| 0xC0 |   | FDC - floppy disk controller |
-| 0xD5 | 0 | Speaker |
+| 0xD6 |   |   |
-| 0xD6 |   | |
+| 0xDA | 1 (2) | Speaker |
+| 0xDC |   | |
+| 0xDE |   | |
 | 0xE0 | 4 | CTC Timer |
 ===== Software ROM =====
-[[https://github.com/GLGPrograms/ceda-rom-disassembly|ROM disassembly]]
+[[https://github.com/GLGPrograms/ceda-rom-disassembly|ROM disassembly]] (work in progress)
 ===== Character ROM =====
@@ Linea 108: / Linea 145: @@
 All signals are "digital" TTL levels (0-5V), which are then interpreted by the CRT HV driver board.
-| Vertical Sync | 20 ms |
+| Vertical Sync | ~20 ms |
-| Horizontal Sync | 52 us |
+| Horizontal Sync | 53 us |
-| Lines | ~380 lines |
+| Lines | 370 lines |
 | Pixel Clock | 15MHz (XTAL3) |
@@ Linea 116: / Linea 153: @@
 If you want to use an external monitor, some active and complex circuit is needed.
-TODO put here some screenshot taken with the oscilloscope
+See oscilloscope pictures:
+{{:ceda:vsync-0.png?direct&200|}}
+{{:ceda:vsync-1.png?direct&200|}}
+{{:ceda:hsync-0.png?direct&200|}}
+{{:ceda:hsync-1.png?direct&200|}}
+{{:ceda:backporch.png?direct&200|}}
 ====== TODO ======