Difference between revisions of "LB-MEM-02"
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==== Parts/Jumpers ==== | ==== Parts/Jumpers ==== | ||
| + | * Square pin is pin 1 | ||
[[FILE:LB-MEM-02_REV1_MECH_Ann.png]] | [[FILE:LB-MEM-02_REV1_MECH_Ann.png]] | ||
| Line 40: | Line 41: | ||
** 4 banks in 27C512 | ** 4 banks in 27C512 | ||
| − | [[file:LB-MEM- | + | {| class="wikitable" |
| + | ! EPROM | ||
| + | ! SIZE | ||
| + | ! BANKS | ||
| + | ! J6(A15/Pin1) | ||
| + | ! J2(A14/Pin27) | ||
| + | ! BANK # | ||
| + | ! LOAD OFFSET | ||
| + | |- | ||
| + | | 27C128 | ||
| + | | 16KB | ||
| + | | 1 | ||
| + | | 2-3 (GND) | ||
| + | | 2-3 (GND) | ||
| + | | 1 | ||
| + | | 0x0000 | ||
| + | |- | ||
| + | | 27C256 | ||
| + | | 32KB | ||
| + | | 2 | ||
| + | | 2-3 (GND) | ||
| + | | 1-2 (VCC) | ||
| + | | 1 | ||
| + | | 0x0000 | ||
| + | |- | ||
| + | | 27C256 | ||
| + | | 32KB | ||
| + | | 2 | ||
| + | | 2-3 (GND) | ||
| + | | 2-3 (GND) | ||
| + | | 2 | ||
| + | | 0x4000 | ||
| + | |- | ||
| + | | 27C512 | ||
| + | | 64KB | ||
| + | | 4 | ||
| + | | 2-3 (GND) | ||
| + | | 2-3 (GND) | ||
| + | | 1 | ||
| + | | 0x0000 | ||
| + | |- | ||
| + | | 27C512 | ||
| + | | 64KB | ||
| + | | 4 | ||
| + | | 2-3 (GND) | ||
| + | | 1-2 (VCC) | ||
| + | | 2 | ||
| + | | 0x4000 | ||
| + | |- | ||
| + | | 27C512 | ||
| + | | 64KB | ||
| + | | 4 | ||
| + | | 1-2 (VCC) | ||
| + | | 2-3 (GND) | ||
| + | | 3 | ||
| + | | 0x8000 | ||
| + | |- | ||
| + | | 27C512 | ||
| + | | 64KB | ||
| + | | 4 | ||
| + | | 1-2 (VCC) | ||
| + | | 1-2 (VCC) | ||
| + | | 4 | ||
| + | | 0xC000 | ||
| + | |- | ||
| + | |} | ||
| + | |||
| + | [[file:LB-MEM-02_EPROM_27C128_256_512.png]] | ||
=== Backplane Connector === | === Backplane Connector === | ||
| Line 59: | Line 127: | ||
== Checkout == | == Checkout == | ||
| + | |||
| + | === Rev 3 === | ||
| + | |||
| + | * Adds PWR and GND on U1 (74HC04) | ||
| + | * Adds electrolytic cap footprint | ||
=== Rev 2 === | === Rev 2 === | ||
| − | * Flips 74HC04 | + | * Flips 74HC04 orientation |
| + | * Missing PWR and GND on U1 (74HC04) | ||
| + | * Tested with [[LB-6809-01]] card | ||
| + | ** Works | ||
| + | |||
| + | === Rev 1 === | ||
| + | |||
* Missing PWR and GND on U1 (74HC04) | * Missing PWR and GND on U1 (74HC04) | ||
| + | ** Added PWR and GND wires to nearest pins with PWR and GND | ||
| + | * SRAM passes in TL866 in SRAM test mode | ||
* Test using [https://raw.githubusercontent.com/douggilliland/Retro-Computers/master/6809/LB-6809/ramLoop/ramLoop.asm ramLoop.asm] software | * Test using [https://raw.githubusercontent.com/douggilliland/Retro-Computers/master/6809/LB-6809/ramLoop/ramLoop.asm ramLoop.asm] software | ||
| − | ** | + | ** [https://raw.githubusercontent.com/douggilliland/Retro-Computers/master/6809/LB-6809/ramLoop/ramLoop.asm ramLoop.asm] code works on [http://6809.uk/ 6809 Emulator] |
*** Forcing an error works | *** Forcing an error works | ||
** Check on card without SRAM | ** Check on card without SRAM | ||
*** Controls/data look OK | *** Controls/data look OK | ||
| − | == | + | == Assembly Sheet == |
| − | + | === Rev 3 === | |
| − | + | * [https://land-boards.com/LB-MEM-02/LB-MEM-02_Rev3_ibom.html Interactive BOM] | |
=== Rev 1 === | === Rev 1 === | ||
* [https://land-boards.com/LB-MEM-02/LB-MEM-02_Rev1_ibom.html Interactive BOM] | * [https://land-boards.com/LB-MEM-02/LB-MEM-02_Rev1_ibom.html Interactive BOM] | ||
Revision as of 18:41, 12 September 2024
Contents
Features
- 32KB SRAM
- 16KB EPROM
- Headers to select PROM bank
- Connects to Address/Data and Memory control lines
- 50x75mm card
Design
SRAM
EPROM
- ATF16V8B part
- TL866ii_Plus_Programmer
- LB-65CXX-01 card has 16 KB PROM from 0xC000-0xFFFF
- LB-6802-01 card has 16 KB PROM from 0xC000-0xFFFF
- LB-6809-01 card has 16 KB PROM from 0xC000-0xFFFF
- LB-Z80-01 card has 8KB PROM from 0x0000-0x1FFF (upper 8KB is not used)
Parts/Jumpers
- Square pin is pin 1
27C256/27C512 EPROMs
- Card has a 16KB size from the CPU
- 27C256 (32KB) and 27C512 (64KB) Flash EPROMs are commonly available
- Jumpers allow firmware banks to be selected
- 2 banks in 27C256
- 4 banks in 27C512
| EPROM | SIZE | BANKS | J6(A15/Pin1) | J2(A14/Pin27) | BANK # | LOAD OFFSET |
|---|---|---|---|---|---|---|
| 27C128 | 16KB | 1 | 2-3 (GND) | 2-3 (GND) | 1 | 0x0000 |
| 27C256 | 32KB | 2 | 2-3 (GND) | 1-2 (VCC) | 1 | 0x0000 |
| 27C256 | 32KB | 2 | 2-3 (GND) | 2-3 (GND) | 2 | 0x4000 |
| 27C512 | 64KB | 4 | 2-3 (GND) | 2-3 (GND) | 1 | 0x0000 |
| 27C512 | 64KB | 4 | 2-3 (GND) | 1-2 (VCC) | 2 | 0x4000 |
| 27C512 | 64KB | 4 | 1-2 (VCC) | 2-3 (GND) | 3 | 0x8000 |
| 27C512 | 64KB | 4 | 1-2 (VCC) | 1-2 (VCC) | 4 | 0xC000 |
Backplane Connector
Mechanicals
Rev 3
Rev 2
Rev 1
Checkout
Rev 3
- Adds PWR and GND on U1 (74HC04)
- Adds electrolytic cap footprint
Rev 2
- Flips 74HC04 orientation
- Missing PWR and GND on U1 (74HC04)
- Tested with LB-6809-01 card
- Works
Rev 1
- Missing PWR and GND on U1 (74HC04)
- Added PWR and GND wires to nearest pins with PWR and GND
- SRAM passes in TL866 in SRAM test mode
- Test using ramLoop.asm software
- ramLoop.asm code works on 6809 Emulator
- Forcing an error works
- Check on card without SRAM
- Controls/data look OK
- ramLoop.asm code works on 6809 Emulator
