Difference between revisions of "LB-MEM-02"
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Blwikiadmin (talk | contribs) (→Rev 2) |
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| Line 64: | Line 64: | ||
* Flips 74HC04 | * Flips 74HC04 | ||
* Missing PWR and GND on U1 (74HC04) | * Missing PWR and GND on U1 (74HC04) | ||
| − | * Test using [] | + | * Test using [https://raw.githubusercontent.com/douggilliland/Retro-Computers/master/6809/LB-6809/ramLoop/ramLoop.asm ramLoop.asm] and no SRAM |
| + | ** Controls/data look OK | ||
=== Rev 1 === | === Rev 1 === | ||
Revision as of 14:58, 7 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
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
Backplane Connector
Mechanicals
Rev 3
Rev 2
Rev 1
Checkout
Rev 2
- Flips 74HC04
- Missing PWR and GND on U1 (74HC04)
- Test using ramLoop.asm and no SRAM
- Controls/data look OK
Rev 1
- GND is missing from U1-7
