First post, by mico
A while back I picked up a Teknor VIPer808 SBC. It's a sweet system that performs well in benchmarks due to the Am5x86-P75 CPU (clocked at 133MHz) and integrated local bus CL-GD5429 VGA. I installed it into a 2 slot ISA backplane with a Yamaha YMF-719 card. My aim is to install this card the smallest case I can find or design. It currently has a single sided 4 MB SIMM module, a Visiontek 8542.S2, parity, FPM and 60 ns access time. Last week I bought some double sided 8 MB modules by IBM; FPM with Parity and 70ns access time but the system does not boot with these installed, the IBM part number is FRU 64F3606. I checked the 'presence detection' pattern and it checks out to be industry standard, not IBM crippled.
The th99 entry for the system is here:
http://th99.classic-computing.de/src/m/S-T/34609.htm
What does the (1) denote next to the memory configuration entries?
Does anyone know if the issue is that the board does not support double sided simms?
Can I hack a double sided SIMM back down to a single sided SIMM?
Here are some extracts from the manual:
2.02 SIMM CONFIGURATION & INSTALLATION
At least 1MB of system memory must be installed on the VIPer808 for proper operation.
Total System Memory can be configured as 1MB, 2MB, 3MB, 4MB, 8MB, 12MB, 16MB,
32MB, 48MB, 64MB or 128MB using 36-bit SIMM devices.
There are two SIMM (Single In-line Memory Module) sockets; these can accept the
following 36-bit modules:
• 256K x 36-bit = 1MB module,
• 512K x 36-bit = 2MB module,
• 1M x 36-bit = 4MB module,
• 2M x 36-bit = 8MB module,
• 4M x 36-bit = 16MB module, and
• 8M x 36-bit = 32MB module.
Note: The VIPer808 board, will also support a total of 128MB of System Memory
when 64MB modules will be available.
Consult the table on the following page to see which SIMM configurations are available
on the VIPer808.
DRAM devices with page mode at 70ns maximum access time is recommended. Please
refer to Appendix E for a list of recommended devices.
...
DRAM (U10 and U11)
DRAM devices with parity bit and with page mode at 70ns maximum access time
are recommended. For example:
MICRON MT10D25636M-7 (256K*36)
NEC MC-42255A36B-70 (256K*36)
SAMSUNG KMM536256C-7 (256K*36)
TOSHIBA THM362500AS-70 (256K*36)
MICRON MT18D51236M-7 (512K*36)
MICRON MT9D136M-7 (1M*36)
NEC MC-421000A36B-70 (1M*36)
SAMSUNG KMM5361000B-7 (1M*36)
TI TM124MBK36R-70 (1M*36)
TOSHIBA THM361020AS-70 (1M*36)
HITACHI HB56D236B2-7C (2M*36)
HITACHI HB56D236BS-7BC (2M*36)
HITACHI HB56D236BW-7B (2M*36)
HITACHI HB56D236BW-7C (2M*36)
HYUNDAI HYM536220W-70 (2M*36)
MICRON MT18D236M-7 (2M*36)
NEC MC422000A36B-70 (2M*36)
SAMSUNG KMM5362000B-7 (2M*36)
TOSHIBA THM362040AS-60 (2M*36)
TOSHIBA THM362040AS-70 (2M*36)
HYUNDAI HYM536410AM-70 (4M*36)
MITSUBISHI MH4M36ANXJ-7 (4M*36)
NEC MC-424000A36BH-70 (4M*36)
NEC MC-424000A36BJ-70 (4M*36)
SAMSUNG KMM5364100-7 (4M*36)
TOSHIBA THM364020S-70 (4M*36)
HITACHI HB56D836BR-70A (8M*36)
TOSHIBA THM368020S-70 (8M*36)
TOSHIBA THM368020SG-70 (8M*36)